Divide by zero in Site:GroundDomain:Slab

[mjwitte]

Issue overview

User file with Site:GroundDomain:Slab fails with NANs when run weather file FIN_US_Espoo.Tapiola.029851_TMYx.2009-2023.epw, but not with other weather files.

   ** Severe  ** DualSetPointWithDeadBand: Unanticipated combination of heating and cooling loads - report to EnergyPlus Development Team
   **   ~~~   ** occurs in Zone=ROOM During Warmup, Environment=RUN PERIOD 1, at Simulation time=01/01 00:03 - 00:06
   **   ~~~   ** LoadToHeatingSetPoint=NAN, LoadToCoolingSetPoint=NAN

The problem is a divide by zero here in SimulateGroundDomain:

EnergyPlus/src/EnergyPlus/PlantPipingSystemsManager.cc

Lines 334 to 335 in ec7398a

	thisDomain.HeatFluxWeightingFactor = thisDomain.TotalEnergyWeightedHeatFlux / thisDomain.TotalEnergyUniformHeatFlux;
	thisDomain.TotalEnergyWeightedHeatFlux = 0.0;

Details

Some additional details for this issue (if relevant):

• Version of EnergyPlus 24.2
• Helpdesk ticket number16778

Checklist

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

• Defect file added in EnergyPlusDevSupport\DefectFiles\
• 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)