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How can I turn off solar heat gains?

asked 2017-10-20 20:01:06 -0500

carlobianchi89's avatar

updated 2017-10-21 07:43:01 -0500

I am using the EMS in EnergyPlus and customizing surface variables such as Dry Bulb Temperature, Wet Bulb Temperature and Wind Speed. I am imposing a Surface Dry Bulb Temperature that takes into account the convective and radiative heat exchanges between the external surface and the environment. If I run the simulation with EnergyPlus, though, the heat gain from the sun is taken into account as well, using the radiation data in the EPW file. How can I turn it off? I can easily regulate the convective heat exchange, customizing the convection coefficient on each surface, but what can I do with the radiative heat exchange? If I set to 0 the incoming radiation I eliminate this contribution, but I also eliminate the sun contribution in terms of light and that's not ideal.

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answered 2017-10-26 11:07:39 -0500

For opaque surfaces, in the Material object for the outermost material layers, set Solar Absorptance to zero to eliminate solar gains from the outside surface heat balance. Likewise to eliminate external thermal radiant exchange (with sky and surroundings), set Thermal Absorptance to near zero.

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Asked: 2017-10-20 20:01:06 -0500

Seen: 157 times

Last updated: Oct 26 '17