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Changing composition of atmosphere in EnergyPlus (e.g. increasing CO2 concentration) to simulate effect on envelope convection

asked 2017-11-10 14:27:41 -0600

Lueker gravatar image

updated 2017-11-13 13:51:19 -0600

As a "fun" project, I'm seeking to simulate the thermal performance of a building envelope in a theoretical atmosphere composed entirely of CO2.

Can EnergyPlus model the resulting effects on interior/exterior convective heat transfer coefficients, say, for blustery conditions in my CO2 atmosphere?

Perhaps a weather file can be manipulated, or convection inputs adjusted, to simulate the effects of this atmosphere?

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answered 2017-11-16 15:02:28 -0600

EPW files are essentially rearranged TMY files, and I don't see anything in the TMY-2 data elements or TMY-3 user guide that correlate to atmospheric composition of air vs. CO2 and resulting change in convection coefficient values. As such, I would recommend adding the SurfaceProperty:ConvectionCoefficients object to your IDF, which can allow users to set interior and exterior convection coefficients using multiple options:

Note that this convection coefficients object can only be applied to a single surface.

The SurfaceProperty:OtherSideCoefficients object is another option, but it can only override exterior surface convective heat transfer coefficients and/or air temperatures.

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Asked: 2017-11-10 14:27:41 -0600

Seen: 71 times

Last updated: 22 hours ago