THERM effective U value

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aishwarya sehra

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Mar 26, 2025, 11:58:29 AMMar 26

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Since THERM provides steady-state U-values under fixed boundary conditions, which do not account for the dynamic thermal behaviors and transient effects present in real-world scenarios. Can integrating these static U-values into dynamic energy simulation tools like EnergyPlus lead to inaccuracies?

Kindly suggest.

Reichard, Georg

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Mar 26, 2025, 5:19:24 PMMar 26

to aishwarya sehra, THERM

EnergyPlus does usually do their own U-Value calculations based on the materials that you select for a construction object.

For these materials It also captures properties (thermal mass/heat capacity) to account for transient effects that you mentioned.

I’m not sure how you “integrate” your static THERM values into these objects.
If you use a proxy material in E+, you would need to define some of these properties as educated guesses … or you can define them as “no mass” materials. There are several discussion on this on UnmetHours, such as https://unmethours.com/question/96489/effect-of-no-mass-materials/

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