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EnergyPlus Crashes with Desiccant System

asked 2024-04-10 05:00:02 -0500

Keigo's avatar

updated 2025-07-11 16:31:04 -0500

I want to model desiccant system, but EnergyPlus crashes. There is not so much information in the err file, and I got stuck. I'm not sure if the crash is due to a bug or my wrong setting. Any advice on how to resolve the crash would be appreciated. AirLoop and part of PlantLoop are as follows. The idf file (V24-1-0) is here.

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So far I have tried the following:

  • I tried with V23-2-0 and V24-1-0. Both crashed.
  • Desiccant system (the red part in the airloop in my sketch) was added to the AirLoop PAU_3-14_Tenant. Before I added the desiccant system, the simulation completed successfully.
  • CHP Hot HWloop was also added for regeneration air heating. I think Generator:MicroCHP is not the cause of the crash. It crached even if I changed the heating coil to Coil:Heating:Electric and removed CHP HWloop.
  • Precooling coil upstream of the desiccant system is not the cause of the crash. I tried removing it, but it still crashed.
  • It crashes during Air System Sizing, so I tried hardsizing everything. I ran simulation for Weather File Run Period only and did not run Sizing Calculation, System Sizing Calculation and Plant Sizing Calculation, but it still crashed.
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answered 2025-07-09 22:49:28 -0500

Keigo's avatar

updated 2025-07-10 01:13:37 -0500

Self-resolved. I updated the idf file to V25-1-0, and it no longer crashes. An err file was generated.

   ** Severe  ** Missing maximum humidity ratio setpoint (MaxHumRat) for 
   **   ~~~   ** Dehumidifier:Desiccant:System: PAU_3-14_TENANT DESICCANT SYSTEM
   **   ~~~   ** Node Referenced=PAU_3-14_TENANT HEAT RECOVERY SUPPLY OUTLET
   **   ~~~   ** use a Setpoint Manager to establish a "MaxHumRat" setpoint at the process air control node.
   **  Fatal  ** Previous severe set point errors cause program termination

The cause was that I was careless and put a setpoint manager for max humidity ratio to a wrong node. The simulation completed successfully after the location of the setpoint manager was revised.

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Asked: 2024-04-10 05:00:02 -0500

Seen: 202 times

Last updated: Jul 10