Update to latest solph offsetconverter API

workshop/model/coefficients-offset-converter.csv

@@ -1,32 +1,32 @@
 ,slope,offset
--10,3.975280241741998,-1714.9334035658824
--9,4.052064477064582,-1707.8183400920395
--8,4.130368258042325,-1697.7399675074953
--7,4.210807840888694,-1685.6739325028082
--6,4.294086559705077,-1672.7372223695832
--5,4.380367691459657,-1658.8276622190456
--4,4.46976125681571,-1643.7958599132035
--3,4.562424139153032,-1627.573699958455
--2,4.658482051105536,-1610.0984022218279
--1,4.758170905891813,-1591.4041050431654
-0,4.861762313822266,-1571.4394473210048
-1,4.969579082090264,-1550.321952503379
-2,5.081641706894415,-1527.663676402653
-3,5.198201148240096,-1503.390331703682
-4,5.319713370023736,-1477.5902081719444
-5,5.446447347496535,-1450.1180916157882
-6,5.5779996989706575,-1419.9975105784702
-7,5.715644172000148,-1388.3297890356873
-8,5.85618246716041,-1350.4422331057672
-9,6.002454159520156,-1309.5088515180098
-10,6.155918795220834,-1266.6590772305244
-11,6.317010535301569,-1221.603519107183
-12,6.486327442296935,-1174.2286790378441
-13,6.664596944175324,-1124.5256860509512
-14,6.852371369223604,-1072.0632031170894
-15,7.050511261548551,-1016.7294502161973
-16,7.259834140017434,-958.2093295712332
-17,7.4813714982636395,-896.3184071761398
-18,7.716333624621206,-830.9886618956353
-19,7.965894617708117,-761.7166759588404
-20,8.231454187857127,-688.1279745186911
+-10,0.2514753973628667,0.047465920610585424
+-9,0.2467066780860508,0.046376068603306536
+-8,0.24202237825654546,0.04523414336514062
+-7,0.2373889935552128,0.04406264169407032
+-6,0.23277409384286044,0.042885301394440745
+-5,0.2281768386928062,0.04170081779701975
+-4,0.22359993078865406,0.040507348499998756
+-3,0.21904393780419062,0.0393049254633848
+-2,0.2145123901760269,0.038093374383691224
+-1,0.21000320440637657,0.036874719813637796
+0,0.20551287772920454,0.035649538050854086
+1,0.20103758057622914,0.03442161409493974
+2,0.19658786890159344,0.03318480596512727
+3,0.19216390349494594,0.031939464477977984
+4,0.18775806141243687,0.030689294100602258
+5,0.18337221719056557,0.029433552146105962
+6,0.17903208650292057,0.028157582916574646
+7,0.17470463452900237,0.02688263367167814
+8,0.17048685743587452,0.025545419256832468
+9,0.1663059406290256,0.02419330976026105
+10,0.16213264579147624,0.022845777978628613
+11,0.15796990114171103,0.02150051783028696
+12,0.1538175277169986,0.020158245387420278
+13,0.14967395822141574,0.01882136291958618
+14,0.14554286452247295,0.017486475612832945
+15,0.14142250383812638,0.01615525312325488
+16,0.13731423432157253,0.014826620250179971
+17,0.13321734077617234,0.013501563990726533
+18,0.12913109223577152,0.012182404004897028
+19,0.12505576707747823,0.01086749662234873
+20,0.12099133338489505,0.00955693776132666

workshop/model/solph-offset.ipynb

@@ -144,22 +144,22 @@
     "hp_thermal_power = 9.1  # kW\n",
     "\n",
     "slope = input_data[\"slope\"][:-1]\n",
-    "offset = input_data[\"offset\"][:-1]/1e3\n",
+    "offset = input_data[\"offset\"][:-1]\n",
     "demand = input_data[\"Heat load (kW)\"][:-1]\n",
     "\n",
     "\n",
     "heat_pump = solph.components.OffsetConverter(\n",
     "        label=f\"heat pump\",\n",
-    "        inputs={bus_electricity: solph.Flow(\n",
-    "            nominal_value=5,\n",
-    "            min=0.0,\n",
-    "        )},\n",
-    "        outputs={bus_heat_35C: solph.Flow(\n",
-    "            nominal_value=hp_thermal_power,\n",
-    "            nonconvex=solph.NonConvex(),\n",
-    "            min=0.5,\n",
-    "        )},\n",
-    "        coefficients=[offset, slope]\n",
+    "        inputs={bus_electricity: solph.Flow()},\n",
+    "        outputs={\n",
+    "            bus_heat_35C: solph.Flow(\n",
+    "                nominal_value=hp_thermal_power,\n",
+    "                nonconvex=solph.NonConvex(),\n",
+    "                min=0.5,\n",
+    "            )\n",
+    "        },\n",
+    "        conversion_factors={bus_electricity: slope},\n",
+    "        normed_offsets={bus_electricity: offset}\n",
     ")\n",
     "\n",
     "es.add(heat_pump)"

workshop/model/tespy-partload-performance.ipynb

@@ -909,13 +909,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The final step to provide the data for the `OffsetConverter` of `oemof-solph` is to change the output structure.\n",
-    "`oemof-solph` expects the coefficients (offset and slope) per ambient temperature level and inverted, i.e. the heat\n",
-    "output as function of the electricity input. We can build a new dataframe, that holds the information and exports it\n",
-    "into csv format and export that information. \n",
+    "The final step is to export the data for the `OffsetConverter` of `oemof-solph`.\n",
+    "`oemof-solph` expects a conversion factor and the normed offset per ambient temperature level for the input and\n",
+    "output flows except a single reference flow. The reference flow will be the heat output of the heat pump. Therefore,\n",
+    "we need to calculate the electricity conversion factor and normed offset as a function of the heat output with the\n",
+    "`least_squares` function, dump the results into a new `DataFrame` and export to csv.\n",
     "\n",
     "```{caution}\n",
-    "The x and y axes are swapped. Before, the heat load was on the x-axis, the compressor power input on the y-axis.\n",
+    "`oemof-solph` expects a normed offset, that is the offset value divided by the rated heat output.\n",
     "```"
    ]
   },
@@ -928,10 +929,11 @@
     "export_df = pd.DataFrame(index=temperature_range, columns=[\"slope\", \"offset\"])\n",
     "\n",
     "for key, data in results.items():\n",
-    "    y = -data.index.values.astype(float)\n",
-    "    x = data[\"compressor-power\"].values.astype(float)\n",
+    "    x = -data.index.values.astype(float)\n",
+    "    y = data[\"compressor-power\"].values.astype(float)\n",
     "    export_df.loc[key] = least_squares(x, y)\n",
     "\n",
+    "export_df[\"offset\"] /= -Q_design\n",
     "export_df.to_csv(\"coefficients-offset-converter.csv\")"
    ]
   }