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"Bad allocation" error in EnergyPlus 25.1 with hydronic radiant floor + air-to-water heat pump

asked 2025-06-26 17:57:24 -0500

nemo's avatar

updated 2025-06-27 14:40:58 -0500

Hello,

I'm modeling a room with a hydronic radiant floor system (ZoneHVAC:LowTemperatureRadiant:VariableFlow) connected to an electric air-to-water heat pump (HeatPump:PlantLoop:EIR:Heating) in EnergyPlus 25.1. My IDF file fails with a "bad allocation" error during sizing calculations, preventing the simulation from starting.

IDF link: https://jmp.sh/s/BDXqqMIGvMXxGhNaCDBH

Full error log:

Program Version,EnergyPlus, Version 25.1.0-68a4a7c774, YMD=2025.06.26 19:28, * Warning * Version: missing in IDF, processing for EnergyPlus version="25.1" * Warning * No reporting elements have been requested. No simulation results produced. * ~~~ * ...Review requirements such as "Output:Table:SummaryReports", "Output:Table:Monthly", "Output:Variable", "Output:Meter" and others. *** Beginning Zone Sizing Calculations * Warning * Calculated design cooling load for zone=NORTH PERIMETER is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs. * Severe * bad allocation *** Warning: Node connection errors not checked - most system input has not been read (see previous warning). *** Fatal error -- final processing. Program exited before simulations began. See previous error messages.


*** ===== Final Error Summary ===== *** The following error categories occurred. Consider correcting or noting. *** No Reporting Elements requested *** ..No Reporting elements have been requested. You will see no output values from your run. *** ..Add Output:Variable, Output:Meter, Output:Table:SummaryReports, Output:Table:Monthly, Output:Table:TimeBins *** ..objects to your input file to receive output values from the simulation.


*** EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors. *** EnergyPlus Sizing Error Summary. During Sizing: 1 Warning; 1 Severe Errors. *** EnergyPlus Terminated--Fatal Error Detected. 3 Warning; 1 Severe Errors; Elapsed Time=00hr 00min 0.43sec

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Comments

Please post an issue at https://github.com/NREL/EnergyPlus/is... so that EnergyPlus can report a better error message and prevent confusion for future users.

shorowit's avatar shorowit  ( 2025-06-27 14:40:45 -0500 )edit

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answered 2025-06-27 09:51:07 -0500

updated 2025-06-27 14:40:39 -0500

I've seen this "Bad Allocation" error before when using the low-temperature radiant (LTR) object type. It was caused by not having the correct references between the LTR object type and the relatively new LTR Design object type that defines the design data used to size the LTR component. In your IDF, since you're using the Variable Flow LTR object type, you should add the corresponding Variable Flow LTR Design object type. Note that one LTR Design object can be "shared" by multiple LTR objects, if they each have the same design data.

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You're brilliant! You saved me. The problem is solved! Thank you so much!

nemo's avatar nemo  ( 2025-06-28 13:51:21 -0500 )edit

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Asked: 2025-06-26 17:57:24 -0500

Seen: 73 times

Last updated: Jun 28