How Do I set the "Field Set: Surface Name, Fraction of Radiant Energy to Surface" parameter for my "ZoneHVACCoolingPanelRadiantConvectiveWater" using OpenStudioSDK

asked 2026-01-20 16:49:38 -0600

chenkianwee
13 ●3

updated 2026-01-21 09:11:25 -0600

I am trying to model ZoneHVACCoolingPanelRadiantConvectiveWater, I am unable to find any functions to set the parameter "Field Set: Surface Name, Fraction of Radiant Energy to Surface" on the documentation. Has anyone done this before? I believe the ZoneHVACBaseboardRadiantConvectiveWater have similar parameters too. Thanks.

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@chenkianwee what simulation tool are you using? Please mention it in the title or body of your post, as well as add a tag so that others can provide better help. It seems like EnergyPlus based on object types that you mention, with possibly the OpenStudio SDK for "... any functions to set the parameter ...".

Aaron Boranian ( 2026-01-21 07:43:30 -0600 )edit

I have added more details hopefully the question is much more clearer. Thanks !

chenkianwee ( 2026-01-21 09:13:59 -0600 )edit

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answered 2026-01-21 13:13:20 -0600

Denis Bourgeois
3928 ●148 ●9 https://www.rd2.ca

updated 2026-01-21 13:21:21 -0600

Seems entirely automated by OpenStudio (SDK), based on the following weighted area distribution (see here, Lines 170 to 190):

-  5% of radiant energy (not on people) hits floor surfaces
- 40% of radiant energy (not on people) hits ceiling surfaces
- 55% of radiant energy (not on people) hits wall surfaces

You can easily test this with the Example model that comes with the OpenStudio Application. Check the ZoneHVAC:CoolingPanel:RadiantConvective:Water object in the generated in.idf - a tally of surface type-specific area weights will match the above distribution.

Haven't tried, but one should be able to adjust these with an EnergyPlus Measure - or even by editing the generated IDF by hand.

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Seems worth requesting these inputs as an enhancement at https://github.com/NREL/OpenStudio/is...

shorowit ( 2026-01-21 14:50:02 -0600 )edit

@Denis Bourgeois Thanks, looking at the forward translator of openstudiosdk is a very good way to figure out what is available. The default is kind of weird considering radiant ceiling panels are on the ceiling, it is not reasonable that 40% of the radiant energy hits the ceiling surfaces. Definitely needs to do some adjustment and it seems like the only way to do this is to write a energyplus measure that adjust the generated idf file.

@shorowit ya definitely a good request for future radiant panels modeling.

Thanks both for answering the question I have a better idea for my next step

chenkianwee ( 2026-01-21 16:25:25 -0600 )edit

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How Do I set the "Field Set: Surface Name, Fraction of Radiant Energy to Surface" parameter for my "ZoneHVACCoolingPanelRadiantConvectiveWater" using OpenStudioSDK

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How Do I set the "Field Set: Surface Name, Fraction of Radiant Energy to Surface" parameter for my "ZoneHVACCoolingPanelRadiantConvectiveWater" using OpenStudioSDK