diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/EffectivenessCalculation.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/EffectivenessCalculation.mo
new file mode 100644
index 00000000000..9f92a07b624
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/EffectivenessCalculation.mo
@@ -0,0 +1,165 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses;
+model EffectivenessCalculation
+  "Model for calculating the heat exchange effectiveness of heat exchangers"
+  extends Modelica.Blocks.Icons.Block;
+
+  parameter Modelica.Units.SI.Efficiency epsS_cool_nominal(max=1) = 0.8
+    "Nominal sensible heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsL_cool_nominal(max=1) = 0.8
+    "Nominal latent heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsS_cool_partload(max=1) = 0.75
+    "Partial load (75%) sensible heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsL_cool_partload(max=1) = 0.75
+    "Partial load (75%) latent heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsS_heat_nominal(max=1) = 0.8
+    "Nominal sensible heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.Efficiency epsL_heat_nominal(max=1) = 0.8
+    "Nominal latent heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.Efficiency epsS_heat_partload(max=1) = 0.75
+    "Partial load (75%) sensible heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.Efficiency epsL_heat_partload(max=1) = 0.75
+    "Partial load (75%) latent heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.VolumeFlowRate v_flow_sup_nominal(min = 100*Modelica.Constants.eps)
+    "Nominal supply air flow rate";
+
+  Modelica.Blocks.Interfaces.RealInput TSup(
+    final min=0,
+    final unit="K",
+    final displayUnit="degC")
+    "Supply air temperature"
+    annotation (Placement(transformation(extent={{-140,20},{-100,60}})));
+  Modelica.Blocks.Interfaces.RealInput TExh(
+    final min=0,
+    final unit="K",
+    final displayUnit="degC")
+    "Exhaust air temperature
+    " annotation (Placement(transformation(extent={{-140,-20},{-100,20}})));
+  Modelica.Blocks.Interfaces.RealInput v_flow_Sup(final unit="m3/s")
+    "Volumetric flow rate of the supply air"
+    annotation (Placement(transformation(extent={{-140,-60},{-100,-20}})));
+  Modelica.Blocks.Interfaces.RealInput v_flow_Exh( final unit="m3/s")
+    "Volumetric flow rate of the exhaust air"
+    annotation (Placement(transformation(extent={{-140,-100},{-100,-60}})));
+  Modelica.Blocks.Interfaces.RealInput y(final unit="1") "Wheel speed ratio"
+    annotation (Placement(transformation(extent={{-140,60},{-100,100}})));
+  Modelica.Blocks.Interfaces.RealOutput epsS(final unit="1")
+    "Sensible heat exchanger effectiveness"
+    annotation (Placement(transformation(extent={{100,30},{120,50}})));
+  Modelica.Blocks.Interfaces.RealOutput epsL(final unit="1")
+    "Latent heat exchanger effectivenessr"
+    annotation (Placement(transformation(extent={{100,-50},{120,-30}})));
+
+protected
+   Real vRat
+   "Ratio of the average operating volumetric air flow rate to the nominal supply air flow rate";
+
+algorithm
+  // calculate effectiveness
+  if TSup > TExh then
+    // cooling mode
+    epsS :=y*(epsS_cool_partload + (epsS_cool_nominal - epsS_cool_partload)*(
+      vRat-0.75)/0.25);
+    epsL :=y*(epsL_cool_partload + (epsL_cool_nominal - epsL_cool_partload)*(
+      vRat-0.75)/0.25);
+  else
+    // heating mode
+    epsS :=y*(epsS_heat_partload + (epsS_heat_nominal - epsS_heat_partload)*(
+      vRat-0.75)/0.25);
+    epsL :=y*(epsL_heat_partload + (epsL_heat_nominal - epsL_heat_partload)*(
+      vRat-0.75)/0.25);
+  end if;
+  epsS := Buildings.Utilities.Math.Functions.smoothMax(
+       x1 = 0.01,
+       x2 = epsS,
+       deltaX = 1E-7);
+  epsS := Buildings.Utilities.Math.Functions.smoothMin(
+       x1 = 0.99,
+       x2 = epsS,
+       deltaX = 1E-7);
+
+  epsL := Buildings.Utilities.Math.Functions.smoothMax(
+       x1 = 0.01,
+       x2 = epsL,
+       deltaX = 1E-7);
+  epsL := Buildings.Utilities.Math.Functions.smoothMin(
+       x1 = 0.99,
+       x2 = epsL,
+       deltaX = 1E-7);
+
+equation
+  // check if the extrapolation goes too far
+  assert(v_flow_Sup - 2*v_flow_Exh < 0 or v_flow_Exh - 2*v_flow_Sup < 0,
+    "Unbalanced air flow ratio",
+    level=AssertionLevel.warning);
+  // calculate the average volumetric air flow and flow rate ratio
+  vRat =  (v_flow_Sup + v_flow_Exh)/2/v_flow_sup_nominal;
+  // check if the extrapolation goes too far
+  assert(vRat > 0.5 and vRat < 1.3,
+    "Operatiing flow rate outside full accuracy range",
+    level=AssertionLevel.warning);
+  annotation (Icon(coordinateSystem(preserveAspectRatio=false), graphics={Text(
+          extent={{-54,28},{50,-40}},
+          textColor={28,108,200},
+          textString="eps")}), Diagram(
+        coordinateSystem(preserveAspectRatio=false)),
+    defaultComponentName="EffCal",
+    Documentation(info="<html>
+<p>
+This block calculates the sensible and latent effectiveness of the heat exchanger for heating and cooling conditions
+at different air flow rates of the supply air stream and the exhaust air stream.
+</p>
+
+<p> It first calculates the average volumetric air flow rate through the heat exchanger by:</p>
+
+<pre>
+  v_ave = (v_sup + v_exh)/2,
+  vRat = v_ave/v_sup_nom,
+</pre>
+
+<p>
+where <code>v_ave</code> is the average volumetric air flow rate,
+<code>v_sup</code> is the air flow of the supply air stream,
+<code>v_exh</code> is the air flow of the exhaust air stream,
+<code>v_sup_nom</code> is the nominal air flow of the supply air stream and 
+<code>vRat</code> is the flow ratio.
+</p>
+
+<p> It then calculates the sensible and latent effectiveness by:</p>
+
+<pre>
+  epsS = y * (epsS_75 + (epsS_100 - epsS_75) * (vRat - 0.75)/0.25),
+  epsL = y * (epsL_75 + (epsL_100 - epsL_75) * (vRat - 0.75)/0.25),
+</pre>
+where <code>epsS</code> and <code>epsL</code> are the effectiveness
+for the sensible and latent heat transfer, respectively.
+<code>epsS_100</code> and <code>epsS_75</code> are the effectiveness 
+for the sensible heat transfer when <code>vRat</code> is 1 and 0.75, respectively.
+<code>epsL_100</code> and <code>epsL_75</code> are the effectiveness 
+for the latent heat transfer when <code>vRat</code> is 1 and 0.75, respectively.
+<code>y</code> is an effectiveness associated with the speed of a rotary wheel.
+
+<p>
+<code>epsS_100</code>, <code>epsS_75</code>, <code>epsL_100</code>, and <code>epsL_75</code> are parameters.
+Depending on the cooling or heating mode, their values are different.
+In this model, if the supply air temperature is larger than the exhaust air temperature, the exchanger is considered to operate under
+the cooling mode;
+Otherwise, it is considered to operate under a heating mode.
+</p>
+
+<P>
+<b>Note:</b> The average volumetric air flow rate should be between 50% and 130% of the nominal supply air flow rate.
+In addition, the ratio of the supply air flow rate to the exhaust air flow rate should be between 0.5 and 2.
+</P>
+
+<h4>References</h4>
+U.S. Department of Energy 2016.
+&quot;EnergyPlus Engineering reference&quot;.
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
+end EffectivenessCalculation;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/HeatExchagerWithInputEffectiveness.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/HeatExchagerWithInputEffectiveness.mo
new file mode 100644
index 00000000000..2e90a038996
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/HeatExchagerWithInputEffectiveness.mo
@@ -0,0 +1,183 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses;
+model HeatExchagerWithInputEffectiveness
+  "Heat and moisture exchanger with varying effectiveness"
+  extends Buildings.Fluid.HeatExchangers.BaseClasses.PartialEffectiveness(
+  redeclare replaceable package Medium1 =
+        Modelica.Media.Interfaces.PartialCondensingGases,
+  redeclare replaceable package Medium2 =
+        Modelica.Media.Interfaces.PartialCondensingGases,
+  sensibleOnly1=false,
+  sensibleOnly2=false,
+  final prescribedHeatFlowRate1=true,
+  final prescribedHeatFlowRate2=true,
+  Q1_flow = epsS * QMax_flow + QLat_flow,
+  Q2_flow = -Q1_flow,
+  mWat1_flow = +mWat_flow,
+  mWat2_flow = -mWat_flow);
+
+  Modelica.Blocks.Interfaces.RealInput epsS(unit="1")
+    "Sensible heat exchanger effectiveness"
+    annotation (Placement(transformation(extent={{-140,20},{-100,60}})));
+  Modelica.Blocks.Interfaces.RealInput epsL(unit="1")
+    "Latent heat exchanger effectiveness"
+    annotation (Placement(transformation(extent={{-140,-60},{-100,-20}})));
+  Modelica.Units.SI.HeatFlowRate QLat_flow
+    "Latent heat exchange from medium 2 to medium 1";
+  Medium1.MassFraction X_w_in1
+    "Inlet water mass fraction of medium 1";
+  Medium2.MassFraction X_w_in2
+    "Inlet water mass fraction of medium 2";
+  Modelica.Units.SI.MassFlowRate mWat_flow
+    "Water flow rate from medium 2 to medium 1";
+  Modelica.Units.SI.MassFlowRate mMax_flow
+    "Maximum water flow rate from medium 2 to medium 1";
+
+protected
+  parameter Integer i1_w(min=1, fixed=false) "Index for water substance";
+  parameter Integer i2_w(min=1, fixed=false) "Index for water substance";
+  Real gai1(min=0, max=1) "Auxiliary variable for smoothing at zero flow";
+  Real gai2(min=0, max=1) "Auxiliary variable for smoothing at zero flow";
+
+initial algorithm
+  i1_w:= -1;
+  i2_w:= -1;
+  for i in 1:Medium1.nXi loop
+      if Modelica.Utilities.Strings.isEqual(string1=Medium1.substanceNames[i],
+                                            string2="Water",
+                                            caseSensitive=false) then
+      i1_w := i;
+    end if;
+   end for;
+  for i in 1:Medium2.nXi loop
+      if Modelica.Utilities.Strings.isEqual(string1=Medium2.substanceNames[i],
+                                            string2="Water",
+                                            caseSensitive=false) then
+      i2_w := i;
+    end if;
+   end for;
+    assert(i1_w > 0, "Substance 'water' is not present in Medium1 '"
+         + Medium1.mediumName + "'.\n"
+         + "Check medium model.");
+    assert(i2_w > 0, "Substance 'water' is not present in Medium2 '"
+         + Medium2.mediumName + "'.\n"
+         + "Check medium model.");
+equation
+  // Definitions for effectiveness model
+  X_w_in1 = Modelica.Fluid.Utilities.regStep(m1_flow,
+                  state_a1_inflow.X[i1_w],
+                  state_b1_inflow.X[i1_w], m1_flow_small);
+  X_w_in2 = Modelica.Fluid.Utilities.regStep(m2_flow,
+                  state_a2_inflow.X[i2_w],
+                  state_b2_inflow.X[i2_w], m2_flow_small);
+
+  // mass exchange
+  // Compute a gain that goes to zero near zero flow rate.
+  // This is required to smoothen the heat transfer at very small flow rates.
+  // Note that gaiK = 1 for abs(mK_flow) > mK_flow_small
+  gai1 = Modelica.Fluid.Utilities.regStep(abs(m1_flow) - 0.75*m1_flow_small,
+              1, 0, 0.25*m1_flow_small);
+  gai2 = Modelica.Fluid.Utilities.regStep(abs(m2_flow) - 0.75*m2_flow_small,
+              1, 0, 0.25*m2_flow_small);
+
+  mMax_flow = smooth(1, min(smooth(1, gai1 * abs(m1_flow)),
+                            smooth(1, gai2 * abs(m2_flow)))) * (X_w_in2 - X_w_in1);
+  mWat_flow = epsL * mMax_flow;
+  // As enthalpyOfCondensingGas is dominated by the latent heat of phase change,
+  // we simplify and use Medium1.enthalpyOfVaporization for the
+  // latent heat that is exchanged among the fluid streams.
+  // This is simply added to QSen_flow, while mass is conserved because
+  // of the assignment of mWat1_flow and mWat2_flow.
+  QLat_flow = mWat_flow * Medium1.enthalpyOfVaporization(Medium1.T_default);
+
+  annotation (
+        Icon(coordinateSystem(preserveAspectRatio=false, extent={{-100,
+            -100},{100,100}}), graphics={
+        Rectangle(
+          extent={{-70,80},{70,-80}},
+          lineColor={0,0,255},
+          pattern=LinePattern.None,
+          fillColor={0,62,0},
+          fillPattern=FillPattern.Solid),
+        Text(
+          extent={{-62,50},{48,-10}},
+          textColor={255,255,255},
+          textString="epsS=%epsS"),
+        Text(
+          extent={{-60,4},{50,-56}},
+          textColor={255,255,255},
+          textString="epsL=%epsL")}),
+          preferredView="info",
+defaultComponentName="hexInpEff",
+Documentation(info="<html>
+<p>
+This block is identical to
+<a href=\"modelica://Buildings.Fluid.MassExchangers.ConstantEffectiveness\">
+Buildings.Fluid.MassExchangers.ConstantEffectivenesst</a>,
+except that the effectiveness are inputs rather than parameters.
+</p>
+
+This model transfers heat and moisture in the amount of
+<pre>
+  QSen = epsS * Q_max,
+  m    = epsL * mWat_max,
+</pre>
+
+where <code>epsS</code> and <code>epsL</code> are input effectiveness
+for the sensible and latent heat transfer,
+<code>Q_max</code> is the maximum sensible heat that can be transferred and
+<code>mWat_max</code> is the maximum moisture that can be transferred.
+
+
+This model can only be used with medium models that define the integer constant
+<code>Water</code> which needs to be equal to the index of the water mass fraction
+in the species vector.
+</html>",
+revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+Changing the effectiveness from parameters to inputs<br/>
+</li>
+<li>
+April 30, 2018, by Filip Jorissen:<br/>
+Set <code>final prescribedHeatFlowRate1=true</code> and 
+<code>final prescribedHeatFlowRate2=true</code>.<br/>
+See
+<a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/907\">#907</a>.
+</li>
+<li>
+April 11, 2017, by Michael Wetter:<br/>
+Corrected bug as <code>Q1_flow</code> did not include latent heat flow rate.<br/>
+This is for issue
+<a href=\"https://github.com/lbl-srg/modelica-buildings/issues/704\">Buildings #704</a>.
+</li>
+<li>
+October 14, 2013 by Michael Wetter:<br/>
+Replaced access to constant <code>Medium1.Water</code> by introducing
+the parameter <code>i1_w</code>, and used a similar construct for
+<code>Medium2</code>.
+This avoids an error during model check as these constants are not known
+in the partial medium model.
+</li>
+<li>
+August 13, 2013 by Michael Wetter:<br/>
+Corrected error in the documentation.
+</li>
+<li>
+July 30, 2013 by Michael Wetter:<br/>
+Updated model to use new variable <code>mWat_flow</code>
+in the base class.
+</li>
+<li>
+January 28, 2010, by Michael Wetter:<br/>
+Added regularization near zero flow.
+</li>
+<li>
+October 21, 2008, by Michael Wetter:<br/>
+First implementation, based on
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.ConstantEffectiveness\">
+Buildings.Fluid.HeatExchangers.ConstantEffectiveness</a>.
+</li>
+</ul>
+</html>"));
+end HeatExchagerWithInputEffectiveness;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mo
new file mode 100644
index 00000000000..6c7a88e12a8
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mo
@@ -0,0 +1,90 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation;
+model EffectivenessCalculation
+    extends Modelica.Icons.Example;
+
+  Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.EffectivenessCalculation
+    epsCal(
+    epsL_cool_nominal=0.6,
+    epsL_cool_partload=0.7,
+    epsS_heat_nominal=0.7,
+    epsL_heat_nominal=0.6,
+    epsS_heat_partload=0.6,
+    epsL_heat_partload=0.5,
+    v_flow_sup_nominal=1) "Effectiveness calculator"
+    annotation (Placement(transformation(extent={{-12,-10},{8,10}})));
+   Modelica.Blocks.Sources.Ramp y(
+    height=0.7,
+    duration=60,
+    offset=0.3,
+    startTime=60) "Wheel speed"
+    annotation (Placement(transformation(extent={{-80,70},{-60,90}})));
+   Modelica.Blocks.Sources.Ramp TSup(
+    height=5,
+    duration=60,
+    offset=273.15 + 20,
+    startTime=0) "Supply air temperature"
+                 annotation (Placement(transformation(extent={{-80,30},{-60,50}})));
+   Modelica.Blocks.Sources.Ramp TExh(
+    height=20,
+    duration=60,
+    offset=273.15 + 15,
+    startTime=0) "Exhaust air temperature"
+    annotation (Placement(transformation(extent={{-80,-10},{-60,10}})));
+   Modelica.Blocks.Sources.Ramp vSup(
+    height=0.7,
+    duration=60,
+    offset=0.3,
+    startTime=0) "Supply air flow rate"
+    annotation (Placement(transformation(extent={{-80,-50},{-60,-30}})));
+   Modelica.Blocks.Sources.Ramp vExh(
+    height=0.8,
+    duration=60,
+    offset=0.2,
+    startTime=0) "Exhaust air flow rate"
+    annotation (Placement(transformation(extent={{-80,-90},{-60,-70}})));
+equation
+  connect(y.y, epsCal.y) annotation (Line(points={{-59,80},{-22,80},{-22,8},{
+          -14,8}}, color={0,0,127}));
+  connect(TSup.y, epsCal.TSup) annotation (Line(points={{-59,40},{-24,40},{-24,
+          4},{-14,4}}, color={0,0,127}));
+  connect(TExh.y, epsCal.TExh)
+    annotation (Line(points={{-59,0},{-14,0}}, color={0,0,127}));
+  connect(vSup.y, epsCal.v_flow_Sup) annotation (Line(points={{-59,-40},{-24,
+          -40},{-24,-4},{-14,-4}}, color={0,0,127}));
+  connect(vExh.y, epsCal.v_flow_Exh) annotation (Line(points={{-59,-80},{-20,
+          -80},{-20,-8},{-14,-8}}, color={0,0,127}));
+  annotation (Icon(coordinateSystem(preserveAspectRatio=false)), Diagram(
+        coordinateSystem(preserveAspectRatio=false)),
+    experiment(Tolerance=1e-6, StopTime=120),
+    __Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mos"
+        "Simulate and plot"),
+    Documentation(info="<html>
+<p>
+Validation test for the block
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.EffectivenessCalculation\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.EffectivenessCalculation</a>.
+</p>
+
+The input signals are configured as follows:
+<ul>
+<li>The temperature of the supply air, <i>TSup</i>, is larger than the temperature of the exhaust air, <i>TExh</i> before <i>20s</i>;
+After that, <i>TSup</i> is less than <i>TExh</i>, leading to a heating mode;
+</ul>
+<ul>
+<li> The supply air flow rate, <i>vSup</i>, and the exhaust air flow rate, <i>vExh</i>, change from 0.3 to 1 and 0.2 to 1 
+during the period from <i>0s</i> to <i>60s</i>, respectively;
+They then stay constant.
+</ul>
+<ul>
+<li> The wheel speed ratio, <i>y</i> keeps constant during the period from <i>0s</i> to <i>60s</i> and then increases from 0.3 to 1
+during the period from <i>60s</i> to <i>120s</i>;
+</ul>
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2022, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
+end EffectivenessCalculation;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mo
new file mode 100644
index 00000000000..2e274a8af77
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mo
@@ -0,0 +1,157 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation;
+model HeatExchagerWithInputEffectiveness
+    "Test model for the heat exchanger with input effectiveness"
+  extends Modelica.Icons.Example;
+
+  package Medium1 = Buildings.Media.Air
+     "Medium of the supply air";
+  package Medium2 = Buildings.Media.Air
+     "Medium of the exhaust air";
+
+  Buildings.Fluid.Sources.Boundary_pT sin_2(
+    redeclare package Medium = Medium2,
+    T=273.15 + 10,
+    use_p_in=true,
+    nPorts=1)
+     "Sink that represents the ambient environment"
+    annotation (Placement(transformation(extent={{-58,-10},
+            {-38,10}})));
+    Modelica.Blocks.Sources.Constant PIn(
+    k=101325 + 100)
+     "Pressure of the exhaust air"
+    annotation (Placement(transformation(extent={{-20,-50},{0,-30}})));
+  Buildings.Fluid.Sources.Boundary_pT sou_2(
+    redeclare package Medium = Medium2,
+    T=273.15 + 5,
+    use_p_in=true,
+    use_T_in=true,
+    nPorts=1)
+     "Source of the exhuast air"
+    annotation (Placement(transformation(extent={{40,-70},
+            {60,-50}})));
+    Modelica.Blocks.Sources.Ramp TSup(
+    height=10,
+    duration=60,
+    offset=273.15 + 30,
+    startTime=120) "Temperature of the supply air"
+    annotation (Placement(transformation(extent={{-100,44},{-80,64}})));
+  Modelica.Blocks.Sources.Constant TDb(k=293.15)
+    "Drybulb temperature of the exhaust air"
+    annotation (Placement(transformation(extent={{-20,-90},{0,-70}})));
+    Modelica.Blocks.Sources.Constant POut(k=101325)
+     "Pressure of the ambient environment"
+      annotation (Placement(transformation(extent={{-100,0},{-80,20}})));
+  Buildings.Fluid.Sources.Boundary_pT sin_1(
+    redeclare package Medium = Medium1,
+    T=273.15 + 30,
+    X={0.012,1 - 0.012},
+    use_p_in=true,
+    p=300000,
+    nPorts=1)
+     "Sink of the supply air"
+    annotation (Placement(transformation(extent={{84,2},{
+            64,22}})));
+  Buildings.Fluid.Sources.Boundary_pT sou_1(
+    redeclare package Medium = Medium1,
+    T=273.15 + 50,
+    X={0.012,1 - 0.012},
+    use_T_in=true,
+    p=100000,
+    nPorts=1)
+     "Source of the supply air"
+    annotation (Placement(transformation(extent={{-60,40},
+            {-40,60}})));
+    Modelica.Blocks.Sources.Constant PSin_1(
+    k=1E5 - 110)
+     "Pressure of the exhaust air"
+    annotation (Placement(transformation(extent={{40,60},{60,80}})));
+  Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.HeatExchagerWithInputEffectiveness hex(
+    redeclare package Medium1 = Medium1,
+    redeclare package Medium2 = Medium2,
+    m1_flow(start=5),
+    m2_flow(start=5),
+    m1_flow_nominal=5,
+    m2_flow_nominal=5,
+    dp1_nominal=100,
+    dp2_nominal=100,
+    show_T=true)
+     "Heat exchanger"
+    annotation (Placement(transformation(extent={{6,-4},{26,16}})));
+  Modelica.Blocks.Sources.Ramp epsS(
+    height=0.1,
+    duration=60,
+    offset=0.7,
+    startTime=120)
+     "Sensible heat exchanger effectiveness"
+    annotation (Placement(transformation(extent={{20,60},{0,80}})));
+  Modelica.Blocks.Sources.Ramp epsL(
+    height=0.1,
+    duration=60,
+    offset=0.7,
+    startTime=60)
+     "Latent heat exchanger effectiveness"
+    annotation (Placement(transformation(extent={{-60,-60},{-40,-40}})));
+equation
+  connect(PIn.y,sou_2. p_in) annotation (Line(
+      points={{1,-40},{20,-40},{20,-52},{38,-52}},
+      color={0,0,127}));
+  connect(TDb.y, sou_2.T_in) annotation (Line(points={{1,-80},{20,-80},{20,-56},
+          {38,-56}}, color={0,0,127}));
+  connect(TSup.y, sou_1.T_in)
+    annotation (Line(points={{-79,54},{-62,54}}, color={0,0,127}));
+  connect(PSin_1.y, sin_1.p_in) annotation (Line(points={{61,70},{90,70},{90,20},
+          {86,20}},     color={0,0,127}));
+  connect(sou_1.ports[1], hex.port_a1) annotation (Line(
+      points={{-40,50},{0,50},{0,12},{6,12}},
+      color={0,127,255}));
+  connect(hex.port_a2, sou_2.ports[1]) annotation (Line(
+      points={{26,5.55112e-16},{32,5.55112e-16},{32,-20},{70,-20},{70,-60},{60,
+          -60}},
+      color={0,127,255}));
+  connect(POut.y, sin_2.p_in) annotation (Line(
+      points={{-79,10},{-68,10},{-68,8},{-60,8}},
+      color={0,0,127}));
+  connect(hex.port_b1, sin_1.ports[1]) annotation (Line(
+      points={{26,12},{45,12},{45,12},{64,12}},
+      color={0,127,255}));
+  connect(hex.port_b2, sin_2.ports[1]) annotation (Line(
+      points={{6,5.55112e-16},{-18,5.55112e-16},{-18,6.66134e-16},{-38,
+          6.66134e-16}},
+      color={0,127,255}));
+  connect(epsS.y, hex.epsS) annotation (Line(points={{-1,70},{-24,70},{-24,10},
+          {4,10}}, color={0,0,127}));
+  connect(hex.epsL, epsL.y) annotation (Line(points={{4,2},{-32,2},{-32,-50},{-39,
+          -50}}, color={0,0,127}));
+ annotation(experiment(Tolerance=1e-6, StopTime=360),
+__Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mos"
+        "Simulate and plot"),
+    Documentation(info="<html>
+<p>
+Validation test for the block
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.HeatExchagerWithInputEffectiveness\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.HeatExchagerWithInputEffectiveness</a>.
+</p>
+
+The input signals are configured as follows:
+<ul>
+<li>Temperature of the supply air, <i>TSup</i>, changes from <i>273.15 + 30 K</i> to <i>273.15 + 40 K</i> during the period from <i>120s</i> to <i>180s</i>;
+</ul>
+<ul>
+<li>Sensible heat exchanger effectiveness, <i>epsS</i>, changes from <i>0.7</i> to <i>0.8</i> during the period from <i>120s</i> to <i>180s</i>;
+</ul>
+<ul>
+<li>Latent heat exchanger effectiveness, <i>epsL</i>, changes from <i>0.7</i> to <i>0.8</i> during the period from <i>60s</i> to <i>120s</i>;
+</ul>
+<p>
+<b>Note:</b> This problem may fail to translate in Dymola 2012 due to an error in Dymola's support
+of stream connector.
+</p>
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
+end HeatExchagerWithInputEffectiveness;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/package.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/package.mo
new file mode 100644
index 00000000000..14ad258bc2f
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/package.mo
@@ -0,0 +1,14 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses;
+package Validation "Collection of models that validate the module in the base classes"
+  extends Modelica.Icons.ExamplesPackage;
+
+annotation (Documentation(info="<html>
+This package contains validation models for the classes in 
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses</a>.
+
+Note that most validation models contain simple input data
+which may not be realistic, but for which the correct
+output can be obtained through an analytic solution.
+</html>"));
+end Validation;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/package.order b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/package.order
new file mode 100644
index 00000000000..4a211246e08
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/package.order
@@ -0,0 +1,2 @@
+HeatExchagerWithInputEffectiveness
+EffectivenessCalculation
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/package.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/package.mo
new file mode 100644
index 00000000000..58f6d8d0156
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/package.mo
@@ -0,0 +1,9 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery;
+package BaseClasses "Package with base classes for Air-to-Air heat recovery devices"
+  extends Modelica.Icons.BasesPackage;
+
+annotation (Documentation(info="<html>
+This package contains base classes that are used to construct the models in
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery\">Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery</a>.
+</html>"));
+end BaseClasses;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/package.order b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/package.order
new file mode 100644
index 00000000000..7f4e0932a11
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/package.order
@@ -0,0 +1,3 @@
+HeatExchagerWithInputEffectiveness
+EffectivenessCalculation
+Validation
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mo
new file mode 100644
index 00000000000..0356cdd76c1
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mo
@@ -0,0 +1,155 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples;
+model BypDam
+  "Test model for the air-to-air thermal wheel with bypass dampers"
+  extends Modelica.Icons.Example;
+  package Medium1 = Buildings.Media.Air
+    "Medium model for supply air";
+  package Medium2 = Buildings.Media.Air
+    "Medium model for exhaust air";
+  Buildings.Fluid.Sources.Boundary_pT sin_2(
+    redeclare package Medium = Medium2,
+    T=273.15 + 10,
+    use_p_in=true,
+    nPorts=1)
+    "Sink of exhaust air"
+    annotation (Placement(transformation(extent={{-58,-10},
+            {-38,10}})));
+    Modelica.Blocks.Sources.Ramp PIn(
+    height=200,
+    duration=60,
+    offset=101330)
+    "Pressure of exhaust air"
+    annotation (Placement(transformation(extent={{-20,-50},{0,-30}})));
+  Buildings.Fluid.Sources.Boundary_pT sou_2(
+    redeclare package Medium = Medium2,
+    T=273.15 + 5,
+    use_p_in=true,
+    use_T_in=true,
+    nPorts=1)
+    "Source of exhaust air"
+    annotation (Placement(transformation(extent={{40,-70},
+            {60,-50}})));
+    Modelica.Blocks.Sources.Ramp TSup(
+    height=10,
+    duration=60,
+    offset=273.15 + 30,
+    startTime=60)
+    "Supply air temperature"
+    annotation (Placement(transformation(extent={{-100,44},{-80,64}})));
+  Modelica.Blocks.Sources.Constant TExh(k=293.15)
+    "Temperature of exhaust air"
+    annotation (Placement(transformation(extent={{-20,-90},{0,-70}})));
+  Modelica.Blocks.Sources.Constant POut(k=101325) "Ambient pressure"
+    annotation (Placement(transformation(extent={{-100,-2},{-80,18}})));
+  Buildings.Fluid.Sources.Boundary_pT sin_1(
+    redeclare package Medium = Medium1,
+    T=273.15 + 30,
+    X={0.012,1 - 0.012},
+    use_p_in=true,
+    p=300000,
+    nPorts=1)
+    "Sink of supply air"
+    annotation (Placement(transformation(extent={{84,2},{
+            64,22}})));
+  Buildings.Fluid.Sources.Boundary_pT sou_1(
+    redeclare package Medium = Medium1,
+    T=273.15 + 50,
+    X={0.012,1 - 0.012},
+    use_T_in=true,
+    p=100000,
+    nPorts=1)
+    "Source of supply air"
+    annotation (Placement(transformation(extent={{-60,40},
+            {-40,60}})));
+    Modelica.Blocks.Sources.Ramp PSin_1(
+    duration=60,
+    startTime=240,
+    height=100,
+    offset=1E5 - 110)
+    "Pressure of the supply air"
+    annotation (Placement(transformation(extent={{40,60},{60,80}})));
+  Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Wheel whe(
+    redeclare package Medium1 = Medium1,
+    redeclare package Medium2 = Medium2,
+    m1_flow(start=5),
+    m2_flow(start=5),
+    m1_flow_nominal=5,
+    m2_flow_nominal=5,
+    dp1_nominal=100,
+    dp2_nominal=100,
+    show_T=true,
+    controlType=Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType.Bypass,
+    epsL_cool_nominal=0.7,
+    epsL_cool_partload=0.6,
+    epsL_heat_nominal=0.7,
+    epsL_heat_partload=0.6)
+    "Wheel"
+    annotation (Placement(transformation(extent={{6,-4},{26,16}})));
+    Modelica.Blocks.Sources.Ramp DamPos(
+    height=1.0,
+    duration=60,
+    offset=0,
+    startTime=60) "Damper position"
+    annotation (Placement(transformation(extent={{-80,-40},{-60,-20}})));
+  inner Modelica.Fluid.System system
+    "Ambient environment"
+    annotation (Placement(transformation(extent={{-20,60},{0,80}})));
+equation
+  connect(PIn.y,sou_2. p_in) annotation (Line(
+      points={{1,-40},{20,-40},{20,-52},{38,-52}},
+      color={0,0,127}));
+  connect(TExh.y, sou_2.T_in) annotation (Line(points={{1,-80},{20,-80},{20,-56},
+          {38,-56}}, color={0,0,127}));
+  connect(TSup.y, sou_1.T_in)
+    annotation (Line(points={{-79,54},{-70.5,54},{-62,54}},
+          color={0,0,127}));
+  connect(PSin_1.y, sin_1.p_in) annotation (Line(points={{61,70},{90,70},{90,20},
+          {86,20}},     color={0,0,127}));
+  connect(sou_1.ports[1],whe. port_a1) annotation (Line(
+      points={{-40,50},{0,50},{0,12},{6,12}},
+      color={0,127,255}));
+  connect(whe.port_a2, sou_2.ports[1]) annotation (Line(
+      points={{26,5.55112e-16},{32,5.55112e-16},{32,-20},{70,-20},{70,-60},{60,
+          -60}},
+      color={0,127,255}));
+  connect(POut.y, sin_2.p_in) annotation (Line(
+      points={{-79,8},{-69.5,8},{-69.5,8},{-60,8}},
+      color={0,0,127}));
+  connect(whe.port_b1, sin_1.ports[1]) annotation (Line(
+      points={{26,12},{45,12},{45,12},{64,12}},
+      color={0,127,255}));
+  connect(whe.port_b2, sin_2.ports[1]) annotation (Line(
+      points={{6,5.55112e-16},{-18,5.55112e-16},{-18,6.66134e-16},{-38,
+          6.66134e-16}},
+      color={0,127,255}));
+  connect(DamPos.y, whe.yBypDam) annotation (Line(points={{-59,-30},{-26,-30},{
+          -26,4},{4,4}}, color={0,0,127}));
+ annotation(experiment(Tolerance=1e-6, StopTime=360),
+__Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mos"
+        "Simulate and plot"),
+    Documentation(info="<html>
+<p>
+Example for using the block
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Wheel\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Wheel</a>.
+</p>
+<p>
+The input signals are configured as follows:</p>
+<ul>
+<li>The temperature of the supply air, <i>TSup</i>, changes from <i>273.15 + 30 K</i> to <i>273.15 + 40 K</i> during the period from <i>60s</i> to <i>120s</i>.
+On the other hand, the temperature of the exhaust air is constant;
+</ul>
+<ul>
+<li>The bypass damper position, <i>DamPos</i>, changes from <i>0</i> to <i>1</i> during the period from <i>60s</i> to <i>120s</i>;
+</ul>
+<b>Note:</b> This problem may fails to translate in Dymola 2012 due to an error in Dymola's support
+of stream connector.
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
+end BypDam;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mo
new file mode 100644
index 00000000000..791cb323559
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mo
@@ -0,0 +1,159 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples;
+model VarSpe
+  "Test model for the air-to-air thermal wheel with a variable speed"
+  extends Modelica.Icons.Example;
+  package Medium1 = Buildings.Media.Air
+    "Medium model for supply air";
+  package Medium2 = Buildings.Media.Air
+    "Medium model for exhaust air";
+  Buildings.Fluid.Sources.Boundary_pT sin_2(
+    redeclare package Medium = Medium2,
+    T=273.15 + 10,
+    use_p_in=true,
+    nPorts=1)
+    "Sink of exhaust air"
+    annotation (Placement(transformation(extent={{-58,-10},
+            {-38,10}})));
+    Modelica.Blocks.Sources.Ramp PIn(
+    height=200,
+    duration=60,
+    offset=101330)
+    "Pressure of exhaust air"
+    annotation (Placement(transformation(extent={{-20,-50},{0,-30}})));
+  Buildings.Fluid.Sources.Boundary_pT sou_2(
+    redeclare package Medium = Medium2,
+    T=273.15 + 5,
+    use_p_in=true,
+    use_T_in=true,
+    nPorts=1)
+    "Source of exhaust air"
+    annotation (Placement(transformation(extent={{40,-70},
+            {60,-50}})));
+    Modelica.Blocks.Sources.Ramp TSup(
+    height=10,
+    duration=60,
+    offset=273.15 + 30,
+    startTime=60)
+    "Supply air temperature"
+    annotation (Placement(transformation(extent={{-100,44},{-80,64}})));
+  Modelica.Blocks.Sources.Constant TExh(k=293.15)
+    "Temperature of exhaust air"
+    annotation (Placement(transformation(extent={{-20,-90},{0,-70}})));
+  Modelica.Blocks.Sources.Constant POut(k=101325) "Ambient pressure"
+    annotation (Placement(transformation(extent={{-100,-2},{-80,18}})));
+  Buildings.Fluid.Sources.Boundary_pT sin_1(
+    redeclare package Medium = Medium1,
+    T=273.15 + 30,
+    X={0.012,1 - 0.012},
+    use_p_in=true,
+    p=300000,
+    nPorts=1)
+    "Sink of supply air"
+    annotation (Placement(transformation(extent={{84,2},{
+            64,22}})));
+  Buildings.Fluid.Sources.Boundary_pT sou_1(
+    redeclare package Medium = Medium1,
+    T=273.15 + 50,
+    X={0.012,1 - 0.012},
+    use_T_in=true,
+    p=100000,
+    nPorts=1)
+    "Source of supply air"
+    annotation (Placement(transformation(extent={{-60,40},
+            {-40,60}})));
+    Modelica.Blocks.Sources.Ramp PSin_1(
+    duration=60,
+    startTime=240,
+    height=100,
+    offset=1E5 - 110)
+    "Pressure of the supply air"
+    annotation (Placement(transformation(extent={{40,60},{60,80}})));
+  Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Wheel whe(
+    redeclare package Medium1 = Medium1,
+    redeclare package Medium2 = Medium2,
+    m1_flow(start=5),
+    m2_flow(start=5),
+    m1_flow_nominal=5,
+    m2_flow_nominal=5,
+    dp1_nominal=100,
+    dp2_nominal=100,
+    show_T=true,
+    controlType=Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType.VariableSpeed,
+    epsL_cool_nominal=0.7,
+    epsL_cool_partload=0.6,
+    epsL_heat_nominal=0.7,
+    epsL_heat_partload=0.6)
+    "Wheel"
+    annotation (Placement(transformation(extent={{6,-4},{26,16}})));
+    Modelica.Blocks.Sources.Ramp WheSpe(
+    height=0.1,
+    duration=60,
+    offset=0.7,
+    startTime=60)
+    "Wheel speed"
+    annotation (Placement(transformation(extent={{-80,-40},{-60,-20}})));
+  inner Modelica.Fluid.System system
+    "Ambient environment"
+    annotation (Placement(transformation(extent={{-20,60},{0,80}})));
+equation
+  connect(PIn.y,sou_2. p_in) annotation (Line(
+      points={{1,-40},{20,-40},{20,-52},{38,-52}},
+      color={0,0,127}));
+  connect(TExh.y, sou_2.T_in) annotation (Line(points={{1,-80},{20,-80},{20,-56},
+          {38,-56}}, color={0,0,127}));
+  connect(TSup.y, sou_1.T_in)
+    annotation (Line(points={{-79,54},{-70.5,54},{-62,54}},
+                                                 color={0,0,127}));
+  connect(PSin_1.y, sin_1.p_in) annotation (Line(points={{61,70},{90,70},{90,20},
+          {86,20}},     color={0,0,127}));
+  connect(sou_1.ports[1],whe. port_a1) annotation (Line(
+      points={{-40,50},{0,50},{0,12},{6,12}},
+      color={0,127,255}));
+  connect(whe.port_a2, sou_2.ports[1]) annotation (Line(
+      points={{26,5.55112e-16},{32,5.55112e-16},{32,-20},{70,-20},{70,-60},{60,
+          -60}},
+      color={0,127,255}));
+  connect(POut.y, sin_2.p_in) annotation (Line(
+      points={{-79,8},{-69.5,8},{-69.5,8},{-60,8}},
+      color={0,0,127}));
+  connect(whe.port_b1, sin_1.ports[1]) annotation (Line(
+      points={{26,12},{45,12},{45,12},{64,12}},
+      color={0,127,255}));
+  connect(whe.port_b2, sin_2.ports[1]) annotation (Line(
+      points={{6,5.55112e-16},{-18,5.55112e-16},{-18,6.66134e-16},{-38,
+          6.66134e-16}},
+      color={0,127,255}));
+  connect(WheSpe.y, whe.yWheSpe) annotation (Line(points={{-59,-30},{-30,-30},{
+          -30,10},{4,10}}, color={0,0,127}));
+ annotation(experiment(Tolerance=1e-6, StopTime=360),
+__Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mos"
+        "Simulate and plot"),
+    Documentation(info="<html>
+<p>
+Example for using the block
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Wheel\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Wheel</a>.
+</p>
+<p>
+The input signals are configured as follows:</p>
+<ul>
+<li>The temperature of the supply air, <i>TSup</i>, changes from <i>273.15 + 30 K</i> to <i>273.15 + 40 K</i> during the period from <i>60s</i> to <i>120s</i>.
+On the other hand, the temperature of the exhaust air is constant;
+</ul>
+<ul>
+<li>The wheel speed, <i>WheSpe</i>, changes from <i>0.7</i> to <i>1</i> during the period from <i>60s</i> to <i>120s</i>;
+</ul>
+<ul>
+<li>The flow rate of the exhaust air changes from  <i>5.24kg/s</i> to <i>1.58kg/s</i> during the period from <i>240s</i> to <i>300s</i>;
+</ul>
+<b>Note:</b> This problem may fails to translate in Dymola 2012 due to an error in Dymola's support
+of stream connector.
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
+end VarSpe;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/package.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/package.mo
new file mode 100644
index 00000000000..a6596ca8803
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/package.mo
@@ -0,0 +1,12 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery;
+package Examples "Collection of models that illustrate model use and test models"
+  extends Modelica.Icons.ExamplesPackage;
+
+annotation (Documentation(info="<html>
+<p>
+This package contains examples for the use of models that can be found in
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery</a>.
+</p>
+</html>"));
+end Examples;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/package.order b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/package.order
new file mode 100644
index 00000000000..fc44ea6bcab
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/package.order
@@ -0,0 +1,2 @@
+BypDam
+VarSpe
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/RecoveryControlType.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/RecoveryControlType.mo
new file mode 100644
index 00000000000..db74605f207
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/RecoveryControlType.mo
@@ -0,0 +1,33 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types;
+type RecoveryControlType = enumeration(
+    Bypass
+    "with a bypass damper",
+    VariableSpeed
+    "with a variable speed wheel")
+     annotation (Documentation(info="<html>
+<p>
+Enumeration for the types of heat recovery (HR) devices.
+The possible values are:
+</p>
+
+<table border=\"1\" summary=\"Explanation of the enumeration\">
+<tr>
+<th>Enumeration</th>
+<th>Description</th></tr>
+<tr><td><code>Bypass</code></td>
+<td>
+The HR devices adjust the heat exchange by modulating the flow rates through the wheel via a bypass damper
+</td></tr>
+<tr><td><code>VariableSpeed</code></td>
+<td>
+The HR devices adjust the heat exchange by modulating the speed of the wheel
+</td></tr>
+</table>
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/package.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/package.mo
new file mode 100644
index 00000000000..345e2527aa8
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/package.mo
@@ -0,0 +1,8 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery;
+package Types "Library of types with choices of how the heat recovery devices are controlled"
+  extends Modelica.Icons.TypesPackage;
+
+annotation (Documentation(info="<html>
+This package contains type definitions for the heat recovery devices.
+</html>"));
+end Types;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/package.order b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/package.order
new file mode 100644
index 00000000000..48920139387
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Types/package.order
@@ -0,0 +1 @@
+RecoveryControlType
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Wheel.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Wheel.mo
new file mode 100644
index 00000000000..c0db9a7c476
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/Wheel.mo
@@ -0,0 +1,284 @@
+within Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery;
+model Wheel "Sensible and latent air-to-air heat recovery wheels"
+  extends Buildings.Fluid.Interfaces.PartialFourPortInterface(
+        redeclare replaceable package Medium1 =
+        Modelica.Media.Interfaces.PartialCondensingGases,
+        redeclare replaceable package Medium2 =
+        Modelica.Media.Interfaces.PartialCondensingGases);
+  extends Buildings.Fluid.Interfaces.FourPortFlowResistanceParameters(
+        final computeFlowResistance1=true,
+        final computeFlowResistance2=true,
+        final from_dp1=false,
+        final from_dp2=false);
+
+  parameter Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType controlType=
+    Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType.Bypass
+    "Type of controller";
+  parameter Real P_nominal(unit="W") = 1000
+    "Power at design condition";
+  parameter Real k(final min=0) = 1
+    "Gain of controller";
+  parameter Modelica.Units.SI.Efficiency epsS_cool_nominal(final max=1) = 0.8
+    "Nominal sensible heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsL_cool_nominal(final max=1) = 0.8
+    "Nominal latent heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsS_cool_partload(final max=1) = 0.75
+    "Partial load (75%) sensible heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsL_cool_partload(final max=1) = 0.75
+    "Partial load (75%) latent heat exchanger effectiveness at the cooling mode";
+  parameter Modelica.Units.SI.Efficiency epsS_heat_nominal(final max=1) = 0.8
+    "Nominal sensible heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.Efficiency epsL_heat_nominal(final max=1) = 0.8
+    "Nominal latent heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.Efficiency epsS_heat_partload(final max=1) = 0.75
+    "Partial load (75%) sensible heat exchanger effectiveness at the heating mode";
+  parameter Modelica.Units.SI.Efficiency epsL_heat_partload(final max=1) = 0.75
+    "Partial load (75%) latent heat exchanger effectiveness at the heating mode";
+
+  Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.HeatExchagerWithInputEffectiveness hex(
+    redeclare package Medium1 = Medium1,
+    redeclare package Medium2 = Medium2,
+    final allowFlowReversal1=allowFlowReversal1,
+    final allowFlowReversal2=allowFlowReversal2,
+    final m1_flow_nominal=m1_flow_nominal,
+    final m2_flow_nominal=m2_flow_nominal,
+    final show_T = true,
+    final dp1_nominal=0,
+    final dp2_nominal=dp2_nominal)
+    "Heat exchanger"
+    annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
+  Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.EffectivenessCalculation
+    effCal(
+    final epsS_cool_nominal=epsS_cool_nominal,
+    final epsL_cool_nominal=epsL_cool_nominal,
+    final epsS_cool_partload=epsS_cool_partload,
+    final epsL_cool_partload=epsL_cool_partload,
+    final epsS_heat_nominal=epsS_heat_nominal,
+    final epsL_heat_nominal=epsL_heat_nominal,
+    final epsS_heat_partload=epsS_heat_partload,
+    final epsL_heat_partload=epsL_heat_partload,
+    final v_flow_sup_nominal=m1_flow_nominal/1.293)
+    "Calculates the effectiveness of heat exhcnages"
+    annotation (Placement(transformation(extent={{40,20},{20,40}})));
+  Modelica.Blocks.Interfaces.RealInput yWheSpe(unit="1") if not with_BypDam
+    "Wheel speed ratio"
+    annotation (Placement(transformation(extent={{-140,20},{-100,60}})));
+  Modelica.Blocks.Interfaces.RealInput yBypDam(unit="1") if with_BypDam
+    "Bypass damper position"
+    annotation (Placement(transformation(extent={{-140,-40},{-100,0}})));
+  Modelica.Blocks.Interfaces.RealOutput P
+    "Electric power consumed by the wheel"
+    annotation (Placement(transformation(extent={{100,-10},{120,10}})));
+  Modelica.Fluid.Sensors.VolumeFlowRate v_flow_Exh(
+    redeclare package Medium = Medium2,
+    final allowFlowReversal=allowFlowReversal2)
+    "Bypass damper position"
+    annotation (Placement(transformation(extent={{34,-14},{20,2}})));
+  Modelica.Fluid.Sensors.VolumeFlowRate v_flow_Sup(
+    redeclare package Medium = Medium1,
+    final allowFlowReversal=allowFlowReversal1)
+    "Bypass damper position"
+    annotation (Placement(transformation(extent={{-56,-2},{-42,14}})));
+  Buildings.Fluid.Actuators.Dampers.Exponential bypDamSup(
+    redeclare package Medium = Medium1,
+    final allowFlowReversal=allowFlowReversal1,
+    final m_flow_nominal=m1_flow_nominal,
+    final dpDamper_nominal=dp1_nominal)
+    "Bypass damper in the supply air stream"
+    annotation (Placement(transformation(extent={{-10,50},{10,70}})));
+  Buildings.Fluid.Actuators.Dampers.Exponential damSup(
+    redeclare package Medium = Medium1,
+    final allowFlowReversal=allowFlowReversal1,
+    final m_flow_nominal=m1_flow_nominal,
+    final dpDamper_nominal=dp1_nominal)
+    "Damper in the supply air stream"
+    annotation (Placement(transformation(
+        extent={{-10,-10},{10,10}},
+        rotation=-90,
+        origin={-70,22})));
+  Buildings.Fluid.Actuators.Dampers.Exponential damExh(
+    redeclare package Medium = Medium2,
+    final allowFlowReversal=allowFlowReversal2,
+    final m_flow_nominal=m2_flow_nominal,
+    final dpDamper_nominal=dp2_nominal)
+    "Damper in the exhaust air stream"
+    annotation (Placement(transformation(
+        extent={{10,10},{-10,-10}},
+        rotation=-90,
+        origin={66,-38})));
+  Buildings.Fluid.Actuators.Dampers.Exponential bypDamExh(
+    redeclare package Medium = Medium2,
+    final allowFlowReversal=allowFlowReversal2,
+    final m_flow_nominal=m2_flow_nominal,
+    final dpDamper_nominal=dp2_nominal)
+    "Bypass damper in the exhaust air stream"
+    annotation (Placement(transformation(extent={{10,-70},{-10,-50}})));
+  Modelica.Blocks.Sources.RealExpression TSup(final y=Medium1.temperature(
+      Medium1.setState_phX(
+        p=port_a1.p,
+        h=inStream(port_a1.h_outflow),
+        X=inStream(port_a1.Xi_outflow))))
+    "Temperature of the supply air"
+    annotation (Placement(transformation(extent={{92,30},{72,50}})));
+  Modelica.Blocks.Sources.RealExpression TExh(final y=Medium2.temperature(
+      Medium2.setState_phX(
+        p=port_a2.p,
+        h=inStream(port_a2.h_outflow),
+        X=inStream(port_a2.Xi_outflow))))
+    "Temperature of the exhaust air"
+    annotation (Placement(transformation(extent={{92,10},{72,30}})));
+  Modelica.Blocks.Sources.Constant zer(final k=0)
+    "Zero signal"
+    annotation (Placement(transformation(extent={{-78,84},{-64,98}})));
+  Modelica.Blocks.Sources.Constant uni(final k=1)
+    "Unity signal"
+    annotation (Placement(transformation(extent={{-76,-88},{-62,-74}})));
+  Modelica.Blocks.Sources.RealExpression PEle(y=P_nominal*effCal.y)
+    "Electrical power consumption"
+    annotation (Placement(transformation(extent={{70,-10},{90,10}})));
+  Modelica.Blocks.Math.Add add(k2=-1)
+    "Adder"
+    annotation (Placement(transformation(extent={{-64,-46},{-48,-30}})));
+protected
+  parameter Boolean with_BypDam = controlType == Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType.Bypass
+    "Boolean flag to enable the bypass control"
+    annotation(Evaluate=true, HideResult=true);
+
+equation
+  connect(effCal.epsS, hex.epsS) annotation (Line(points={{19,34},{-22,34},{-22,
+          4},{-12,4}}, color={0,0,127}));
+  connect(effCal.epsL, hex.epsL) annotation (Line(points={{19,26},{-18,26},{-18,
+          -4},{-12,-4}}, color={0,0,127}));
+  if with_BypDam then
+    connect(bypDamExh.y, yBypDam)
+      annotation (Line(points={{0,-48},{0,-20},{-120,-20}}, color={0,0,127}));
+    connect(bypDamSup.y, yBypDam) annotation (Line(points={{0,72},{0,80},{-80,80},
+            {-80,-20},{-120,-20}}, color={0,0,127}));
+    connect(uni.y, effCal.y) annotation (Line(points={{-61.3,-81},{56,-81},{56,38},
+            {42,38}}, color={0,0,127}));
+    connect(add.u2, yBypDam) annotation (Line(points={{-65.6,-42.8},{-92,-42.8},{-92,
+          -20},{-120,-20}}, color={0,0,127}));
+  else
+    connect(effCal.y, yWheSpe) annotation (Line(points={{42,38},{56,38},{56,52},
+            {-72,52},{-72,40},{-120,40}}, color={0,0,127}));
+    connect(bypDamExh.y, zer.y) annotation (Line(points={{0,-48},{0,-32},{-34,-32},
+            {-34,91},{-63.3,91}}, color={0,0,127}));
+    connect(add.u2, zer.y) annotation (Line(points={{-65.6,-42.8},{-80,-42.8},{-80,
+          -24},{-34,-24},{-34,91},{-63.3,91}}, color={0,0,127}));
+    connect(zer.y, bypDamSup.y)
+    annotation (Line(points={{-63.3,91},{0,91},{0,72}}, color={0,0,127}));
+  end if;
+  connect(TSup.y, effCal.TSup) annotation (Line(points={{71,40},{66,40},{66,34},
+          {42,34}}, color={0,0,127}));
+  connect(TExh.y, effCal.TExh) annotation (Line(points={{71,20},{66,20},{66,30},
+          {42,30}}, color={0,0,127}));
+  connect(v_flow_Exh.port_b, hex.port_a2)
+    annotation (Line(points={{20,-6},{10,-6}}, color={0,127,255}));
+  connect(v_flow_Exh.V_flow, effCal.v_flow_Exh) annotation (Line(points={{27,2.8},
+          {27,10},{46,10},{46,22},{42,22}},      color={0,0,127}));
+  connect(hex.port_a1, v_flow_Sup.port_b)
+    annotation (Line(points={{-10,6},{-42,6}}, color={0,127,255}));
+  connect(v_flow_Sup.V_flow, effCal.v_flow_Sup) annotation (Line(points={{-49,
+          14.8},{-49,18},{50,18},{50,26},{42,26}}, color={0,0,127}));
+  connect(bypDamSup.port_a, port_a1)
+    annotation (Line(points={{-10,60},{-100,60}}, color={0,127,255}));
+  connect(bypDamSup.port_b, port_b1)
+    annotation (Line(points={{10,60},{100,60}}, color={0,127,255}));
+  connect(bypDamExh.port_a, port_a2)
+    annotation (Line(points={{10,-60},{100,-60}}, color={0,127,255}));
+  connect(bypDamExh.port_b, port_b2)
+    annotation (Line(points={{-10,-60},{-100,-60}}, color={0,127,255}));
+  connect(hex.port_b1, port_b1) annotation (Line(points={{10,6},{62,6},{62,60},{
+          100,60}}, color={0,127,255}));
+  connect(hex.port_b2, port_b2) annotation (Line(points={{-10,-6},{-28,-6},{-28,
+          -60},{-100,-60}}, color={0,127,255}));
+  connect(PEle.y, P)
+  annotation (Line(points={{91,0},{110,0}}, color={0,0,127}));
+  connect(v_flow_Sup.port_a, damSup.port_b)
+    annotation (Line(points={{-56,6},{-70,6},{-70,12}}, color={0,127,255}));
+  connect(damSup.port_a, port_a1)
+    annotation (Line(points={{-70,32},{-70,60},{-100,60}}, color={0,127,255}));
+  connect(v_flow_Exh.port_a, damExh.port_b)
+    annotation (Line(points={{34,-6},{66,-6},{66,-28}}, color={0,127,255}));
+  connect(damExh.port_a, port_a2)
+    annotation (Line(points={{66,-48},{66,-60},{100,-60}}, color={0,127,255}));
+  connect(add.u1, uni.y) annotation (Line(points={{-65.6,-33.2},{-72,-33.2},{-72,
+          -68},{-48,-68},{-48,-81},{-61.3,-81}}, color={0,0,127}));
+  connect(add.y, damExh.y)
+    annotation (Line(points={{-47.2,-38},{54,-38}}, color={0,0,127}));
+  connect(damSup.y, add.y) annotation (Line(points={{-58,22},{-38,22},{-38,-38},
+          {-47.2,-38}}, color={0,0,127}));
+  annotation (
+        defaultComponentName="whe",
+        Icon(coordinateSystem(preserveAspectRatio=false), graphics={
+        Rectangle(
+          extent={{-92,-55},{-40,-64}},
+          lineColor={0,0,255},
+          pattern=LinePattern.None,
+          fillColor={0,0,0},
+          fillPattern=FillPattern.Solid),
+        Rectangle(
+          extent={{-94,65},{-40,56}},
+          lineColor={0,0,255},
+          pattern=LinePattern.None,
+          fillColor={0,0,0},
+          fillPattern=FillPattern.Solid),
+        Line(points={{-30,110},{36,110}}, color={28,108,200}),
+        Ellipse(extent={{0,100},{36,-100}}, lineColor={28,108,200}),
+        Polygon(
+          points={{0,100},{0,100}},
+          lineColor={28,108,200},
+          fillColor={255,255,255},
+          fillPattern=FillPattern.None),
+        Rectangle(
+          extent={{-4,100},{20,-100}},
+          fillColor={255,255,255},
+          fillPattern=FillPattern.Solid,
+          pattern=LinePattern.None),
+        Ellipse(
+          extent={{-44,100},{-8,-100}},
+          lineColor={28,108,200},
+          fillColor={28,108,200},
+          fillPattern=FillPattern.Solid),
+        Line(points={{-24,-100},{20,-100}}, color={28,108,200}),
+        Line(points={{-26,100},{18,100}}, color={28,108,200}),
+        Rectangle(
+          extent={{32,64},{94,56}},
+          lineColor={0,0,255},
+          pattern=LinePattern.None,
+          fillColor={0,0,0},
+          fillPattern=FillPattern.Solid),
+        Rectangle(
+          extent={{32,-56},{94,-64}},
+          lineColor={0,0,255},
+          pattern=LinePattern.None,
+          fillColor={0,0,0},
+          fillPattern=FillPattern.Solid)}), Diagram(
+        coordinateSystem(preserveAspectRatio=false)),
+    Documentation(info="<html>
+Model for a generic, sensible and latent air-to-air heat recovery wheel, that consists of 
+a heat exchanger and primary/secondary airflow bypass dampers.
+
+The input requires no geometric data. Performance is defined by specifying sensible and/or latent effectiveness 
+at 75% and 100% of the nominal supply air flow rate in both heating and cooling conditions
+For details, refer to
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.EffectivenessCalculation\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.EffectivenessCalculation</a>.
+
+The operation of the heat recovery wheel is adjustable through wheel speed modulation or bypassing supply air 
+around the heat exchanger.
+The parameter, <i>controlType</i>, can be used to specify either wheel speed modulation or bypassing supply air
+is used.
+See more in  
+<a href=\"modelica://Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType\">
+Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Types.RecoveryControlType</a>.
+
+</html>", revisions="<html>
+<ul>
+<li>
+September 29, 2023, by Sen Huang:<br/>
+First implementation<br/>
+</li>
+</ul>
+</html>"));
+end Wheel;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/package.mo b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/package.mo
new file mode 100644
index 00000000000..d8cdccd3f7b
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/package.mo
@@ -0,0 +1,8 @@
+within Buildings.Fluid.HeatExchangers;
+package AirToAirHeatRecovery "Package with Air-to-Air heat recovery devices"
+  extends Modelica.Icons.VariantsPackage;
+
+annotation (Documentation(info="<html>
+This package contains components models for air-to-air energy recovery devices.
+</html>"));
+end AirToAirHeatRecovery;
diff --git a/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/package.order b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/package.order
new file mode 100644
index 00000000000..ce6fe8b4e8d
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/AirToAirHeatRecovery/package.order
@@ -0,0 +1,4 @@
+Wheel
+BaseClasses
+Types
+Examples
diff --git a/Buildings/Fluid/HeatExchangers/package.order b/Buildings/Fluid/HeatExchangers/package.order
index 51720af5ff2..ba02d079c0a 100644
--- a/Buildings/Fluid/HeatExchangers/package.order
+++ b/Buildings/Fluid/HeatExchangers/package.order
@@ -12,6 +12,7 @@ WetCoilCounterFlow
 WetCoilDiscretized
 WetCoilEffectivenessNTU
 ActiveBeams
+AirToAirHeatRecovery
 CoolingTowers
 RadiantSlabs
 Radiators
diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_BaseClasses_Validation_EffectivenessCalculation.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_BaseClasses_Validation_EffectivenessCalculation.txt
new file mode 100644
index 00000000000..94e15e5c940
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_BaseClasses_Validation_EffectivenessCalculation.txt
@@ -0,0 +1,15 @@
+last-generated=2023-09-25
+statistics-simulation=
+{
+  "linear": " ",
+  "nonlinear": " ",
+  "numerical Jacobians": "0"
+}
+time=[0e+00, 1.2e+02]
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_BaseClasses_Validation_HeatExchagerWithInputEffectiveness.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_BaseClasses_Validation_HeatExchagerWithInputEffectiveness.txt
new file mode 100644
index 00000000000..f3812a75f04
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_BaseClasses_Validation_HeatExchagerWithInputEffectiveness.txt
@@ -0,0 +1,19 @@
+last-generated=2023-09-25
+statistics-initialization=
+{
+  "nonlinear": "0, 0",
+  "numerical Jacobians": "0"
+}
+statistics-simulation=
+{
+  "linear": " ",
+  "nonlinear": " ",
+  "numerical Jacobians": "0"
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_BypDam.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_BypDam.txt
new file mode 100644
index 00000000000..184306e5f72
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_BypDam.txt
@@ -0,0 +1,23 @@
+last-generated=2023-09-28
+statistics-initialization=
+{
+  "nonlinear": "1, 0",
+  "numerical Jacobians": "0"
+}
+statistics-simulation=
+{
+  "linear": "4, 4",
+  "nonlinear": "0, 1, 0, 0",
+  "number of continuous time states": "8",
+  "numerical Jacobians": "0"
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_VarSpe.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_VarSpe.txt
new file mode 100644
index 00000000000..1e58e855c9d
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_VarSpe.txt
@@ -0,0 +1,23 @@
+last-generated=2023-09-28
+statistics-initialization=
+{
+  "nonlinear": "1, 0",
+  "numerical Jacobians": "0"
+}
+statistics-simulation=
+{
+  "linear": "4, 4",
+  "nonlinear": "0, 1, 0, 0",
+  "number of continuous time states": "8",
+  "numerical Jacobians": "0"
+}
+time=[0e+00, 3.6e+02]
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_Wheel.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_Wheel.txt
new file mode 100644
index 00000000000..ddf79bce048
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_AirToAirHeatRecovery_Examples_Wheel.txt
@@ -0,0 +1,18 @@
+last-generated=2023-09-27
+statistics-simulation=
+{
+  "linear": "4, 4",
+  "nonlinear": "0, 0, 0, 0",
+  "number of continuous time states": "4",
+  "numerical Jacobians": "0"
+}
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+whe.effCal.epsL=[4.040385484695435e-01, 4.324957435983013e-01, 4.515210994857404e-01, 4.668611876524033e-01, 4.80072171796706e-01, 4.918503165245056e-01, 5.025789726709812e-01, 5.124958733167062e-01, 5.217605252109901e-01, 5.304862224656023e-01, 5.387567281723022e-01, 5.466361078337888e-01, 5.541746600654557e-01, 5.614126935689026e-01, 5.683831543412451e-01, 5.751133561134338e-01, 5.816263583570672e-01, 5.875312675324159e-01, 5.925528960573978e-01, 5.975745299035463e-01, 6.025961637496948e-01, 6.076177975958433e-01, 6.126394314419918e-01, 6.176610546458072e-01, 6.226826884919557e-01, 6.277043223381042e-01, 6.327259561842528e-01, 6.377475900304013e-01, 6.427692132342167e-01, 6.477908470803652e-01, 6.528124809265137e-01, 6.578341147726622e-01, 6.628557486188107e-01, 6.678773718228788e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.695512533187866e-01, 6.678780870485522e-01, 6.627633615482537e-01, 6.574957875840031e-01, 6.520609259605408e-01, 6.46441648129524e-01, 6.406178674858352e-01, 6.345653919676859e-01, 6.282549986645067e-01, 6.216506958007812e-01, 6.147070647321822e-01, 6.073656933100384e-01, 5.99549206295146e-01, 5.911514013683548e-01, 5.820193886756897e-01, 5.719183266498878e-01, 5.604531581018929e-01, 5.468531916571295e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01, 5.41580855846405e-01]
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mos
new file mode 100644
index 00000000000..35153c815f9
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/EffectivenessCalculation.mos
@@ -0,0 +1,5 @@
+simulateModel("Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.EffectivenessCalculation", stopTime=120, method="CVode", tolerance=1e-6, resultFile="EffectivenessCalculation");
+createPlot(id=1, position={55, 14, 975, 618}, y={"y.y"}, range={0.0, 120.0, 0.0, 2.0}, grid=true, subPlot=101, colors={{28,108,200}}, timeUnit="s", displayUnits={"1"});
+createPlot(id=1, position={55, 14, 975, 618}, y={"TSup.y", "TExh.y"}, range={0.0, 120.0, 280.0, 320.0}, grid=true, subPlot=102, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"K", "K"});
+createPlot(id=1, position={55, 14, 975, 618}, y={"vSup.y", "vExh.y"}, range={0.0, 120.0, 0.0, 2.0}, grid=true, subPlot=103, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"m3/s", "m3/s"});
+createPlot(id=1, position={55, 14, 975, 618}, y={"epsCal.epsS", "epsCal.epsL"}, range={0.0, 120.0, 0.0, 1.0}, grid=true, subPlot=104, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"1", "1"});
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mos
new file mode 100644
index 00000000000..9a031778b18
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/BaseClasses/Validation/HeatExchagerWithInputEffectiveness.mos
@@ -0,0 +1,4 @@
+simulateModel("Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.HeatExchagerWithInputEffectiveness", stopTime=360, method="CVode", tolerance=1e-6, resultFile="HeatExchagerWithInputEffectiveness");
+createPlot(id=1, position={28, 18, 1047, 662}, y={"hex.sta_a1.T", "hex.sta_b2.T"}, range={0.0, 360.0, 25.0, 45.0}, grid=true, subPlot=101, colors={{28,108,200}, {238,46,47}}, displayUnits={"degC", "degC"});
+createPlot(id=1, position={28, 18, 1047, 662}, y={"epsS.y", "epsL.y"}, range={0.0, 360.0, 0.65, 0.8500000000000001}, grid=true, subPlot=102, colors={{28,108,200}, {238,46,47}});
+createPlot(id=1, position={28, 18, 1047, 662}, y={"hex.sta_b2.X[1]", "hex.sta_b1.X[1]"}, range={0.0, 360.0, 0.01, 0.012}, grid=true, subPlot=103, colors={{28,108,200}, {238,46,47}}, displayUnits={"kg/kg", "kg/kg"});
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mos
new file mode 100644
index 00000000000..187b4edc989
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/BypDam.mos
@@ -0,0 +1,6 @@
+simulateModel("Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.BypDam", stopTime=360, method="CVode", tolerance=1e-06, resultFile="Wheel");
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.sta_b1.T", "TSup.y"}, range={0.0, 360.0, 280.0, 320.0}, grid=true, subPlot=101, colors={{238,46,47}, {28,108,200}}, timeUnit="s", displayUnits={"K", ""});
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.m1_flow", "whe.m2_flow"}, range={0.0, 360.0, 0.0, 20.0}, grid=true, subPlot=102, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"kg/s", "kg/s"});
+createPlot(id=1, position={40, -1, 890, 669}, y={"TExh.y", "whe.sta_b2.T"}, range={0.0, 360.0, 290.0, 310.0}, grid=true, subPlot=103, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"", "K"});
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.yBypDam"}, range={0.0, 360.0, 0.6000000000000001, 0.9000000000000001}, grid=true, subPlot=104, colors={{28,108,200}}, timeUnit="s", displayUnits={"1"});
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.effCal.epsS", "whe.effCal.epsL"}, range={0.0, 360.0, 0.0, 1.0}, grid=true, subPlot=105, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"1", "1"});
\ No newline at end of file
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mos
new file mode 100644
index 00000000000..397c0701430
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/AirToAirHeatRecovery/Examples/VarSpe.mos
@@ -0,0 +1,6 @@
+simulateModel("Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.VarSpe", stopTime=360, method="CVode", tolerance=1e-06, resultFile="Wheel");
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.sta_b1.T", "TSup.y"}, range={0.0, 360.0, 280.0, 320.0}, grid=true, subPlot=101, colors={{238,46,47}, {28,108,200}}, timeUnit="s", displayUnits={"K", ""});
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.m1_flow", "whe.m2_flow"}, range={0.0, 360.0, 0.0, 20.0}, grid=true, subPlot=102, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"kg/s", "kg/s"});
+createPlot(id=1, position={40, -1, 890, 669}, y={"TExh.y", "whe.sta_b2.T"}, range={0.0, 360.0, 290.0, 310.0}, grid=true, subPlot=103, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"", "K"});
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.yWheSpe"}, range={0.0, 360.0, 0.6000000000000001, 0.9000000000000001}, grid=true, subPlot=104, colors={{28,108,200}}, timeUnit="s", displayUnits={"1"});
+createPlot(id=1, position={40, -1, 890, 669}, y={"whe.effCal.epsS", "whe.effCal.epsL"}, range={0.0, 360.0, 0.0, 1.0}, grid=true, subPlot=105, colors={{28,108,200}, {238,46,47}}, timeUnit="s", displayUnits={"1", "1"});
\ No newline at end of file
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.EffectivenessCalculation.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.EffectivenessCalculation.mos
new file mode 100644
index 00000000000..bbd2548b96f
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.EffectivenessCalculation.mos
@@ -0,0 +1,10 @@
+compareVars :=
+  {
+    "y.y",
+    "TSup.y",
+    "TExh.y",
+    "vSup.y",
+    "vExh.y",
+    "epsCal.epsS",
+    "epsCal.epsL"
+  };
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.HeatExchagerWithInputEffectiveness.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.HeatExchagerWithInputEffectiveness.mos
new file mode 100644
index 00000000000..d3c7eec0c58
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.BaseClasses.Validation.HeatExchagerWithInputEffectiveness.mos
@@ -0,0 +1,9 @@
+compareVars :=
+  {
+    "hex.sta_a1.T",
+    "hex.sta_b2.T",
+    "epsS.y",
+    "epsL.y",
+    "hex.sta_b2.X[1]",
+    "hex.sta_b1.X[1]"
+  };
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.BypDam.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.BypDam.mos
new file mode 100644
index 00000000000..c91e511a830
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.BypDam.mos
@@ -0,0 +1,12 @@
+compareVars :=
+  {
+    "whe.sta_b1.T",
+    "TSup.y",
+    "whe.m1_flow",
+    "whe.m2_flow",
+    "TExh.y",
+    "whe.sta_b2.T",
+    "whe.yBypDam",
+    "whe.effCal.epsS",
+    "whe.effCal.epsL"
+  };
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.VarSpe.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.VarSpe.mos
new file mode 100644
index 00000000000..968dfc40b9f
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery.Examples.VarSpe.mos
@@ -0,0 +1,12 @@
+compareVars :=
+  {
+    "whe.sta_b1.T",
+    "TSup.y",
+    "whe.m1_flow",
+    "whe.m2_flow",
+    "TExh.y",
+    "whe.sta_b2.T",
+    "whe.yWheSpe",
+    "whe.effCal.epsS",
+    "whe.effCal.epsL"
+  };
diff --git a/Buildings/package.mo b/Buildings/package.mo
index fe23b6bdc2d..aa328b958ce 100644
--- a/Buildings/package.mo
+++ b/Buildings/package.mo
@@ -268,6 +268,12 @@ have been <b style=\"color:blue\">improved</b> in a
                      This is for <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/1781\">IBPSA, #1781</a>.
     </td>
 </tr>
+<tr><td valign=\"top\">Buildings.Fluid.HeatExchangers.AirToAirHeatRecovery
+    </td>
+    <td valign=\"top\">	Package of models for air-to-air heat recovery devices.<br/>
+                       This is for <a href=\"https://github.com/lbl-srg/modelica-buildings/issues/3538\">issue 3538</a>.
+    </td>
+</tr>
 <tr><td colspan=\"2\"><b>Buildings.ThermalZones.ReducedOrder</b>
     </td>
 </tr>