Set constant radiation heat transfer coefficient

asked 2026-01-06 02:14:23 -0600

Jack Lee's avatar

updated 2026-01-06 09:09:22 -0600

Is there a way to set the constant radiation heat transfer coefficient in EnergyPlus?

I know that the convection heat transfer coefficient can be overridden using SurfaceProperty:ConvectionCoefficients. However, the radiative part (exchange with sky, ground, and air) seems to be calculated automatically.

Is it possible for the user to set the radiation heat transfer coefficient?

What I have tried so far: if I use SurfaceConvectionAlgorithm:Outside with SimpleCombinedSurfaceConvectionAlgorithm:Outside with SimpleCombined, it seems possible to treat convection and radiation as a single combined coefficient. But when I override the SurfaceProperty:ConvectionCoefficients, the radiation component still appears to be computed automatically.

Thank you in advance.

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Here are my idf and csv results. When I set SurfaceProperty:ConvectionCoefficients for surface 3, the Surface Outside Face Thermal Radiation to Air Heat Transfer Coefficient value in Output:Variable is automatically calculated. Can the user set the radiation coefficient value?

IDFCSVEPW

Jack Lee's avatar Jack Lee  ( 2026-01-06 02:39:24 -0600 )edit