Energyplus water heater sizing -99999.0

asked 2022-08-11 14:34:28 -0600

xchen's avatar

updated 2022-08-12 10:42:07 -0600

Aaron Boranian's avatar

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In the energyplus html report, I noticed that the Equipment Summary section reports Input for service water heating as "-99999.0". What does this mean?

The water heater is modeled as autosized. But in other models that I have water heater autosized, this report will show an autosized input rate not -99999.0.

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@xchen are you running just a design day simulation, or both design days plus a run period (usually annual simulation) using the EPW weather file?

Aaron Boranian's avatar Aaron Boranian  ( 2022-08-12 10:43:10 -0600 )edit

Both design days and a run period using a epw weather file.

xchen's avatar xchen  ( 2022-08-12 16:10:34 -0600 )edit

I looked up the EnergyPlus repo on github and it seems to be a flag for autosize. https://github.com/NREL/EnergyPlus/bl... // Test for #9001: Make sure BackupElementCapacity is reset when equal to DataSizing::Autosize which is -99999.0 // or a negative number because this results in negative electricity consumption.

xchen's avatar xchen  ( 2023-10-11 17:35:38 -0600 )edit
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