ZoneCrossMixing and ZoneMixing vector error when source is a zone and space heat balance is active

[mjwitte]

Issue overview

For ZoneCrossMixing and ZoneMixing when space HB is active, if the source is a zone (not a space) it will hit a vector error here, because fromSpaceIndex is 0:

EnergyPlus/src/EnergyPlus/ZoneEquipmentManager.cc

Line 5863 in eb6665f

auto &fromSpaceHB = state.dataZoneTempPredictorCorrector->spaceHeatBalance(thisCrossMixing.fromSpaceIndex);

Details

Some additional details for this issue (if relevant):

• Version of EnergyPlus 24.2.0-2fda8439ae
• Discovered during Space Sizing and HVAC Part 4 #10566 development.

Checklist

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

• Defect files attached:
  5ZoneAirCooledWithSpacesHVAC-Mix-Zone.idf.txt
  5ZoneAirCooledWithSpacesHVAC-XMix-ZoneZone.idf.txt

• 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)