EnergyPlus Crashes with Fan:SystemModel with Discrete speeds

[Ski90Moo]

Issue overview

Please see https://unmethours.com/question/100609/how-to-implement-fansystemmodel-with-discrete-speeds/

Details

Some additional details for this issue (if relevant):

• Platform (Operating system, version) Windows 11
• Version of EnergyPlus (if using an intermediate build, include SHA) 24.2
• Unmethours link or helpdesk ticket number https://unmethours.com/question/100609/how-to-implement-fansystemmodel-with-discrete-speeds/

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added (list location of defect file here)https://www.dropbox.com/t/mZ59GtQHkCVlT7E5
• Ticket added to EnergyPlus Defect Complexity (Github Project)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)

Workaround:

Autosizing cooling and heating air flow rate inputs mayy avoid this crash.

[rraustad]

Crash is here in GetVRFInput before the fan is sized and before massFlowAtSpeed is allocated: