Adiabatic Surfaces in EnergyPlus

asked 2020-09-28 10:33:43 -0500

Roheet gravatar image

updated 2020-10-01 09:51:38 -0500

Hi. I am running a simplified model to optimize envelope characteristics. Actually I have a building with 9 zones (3*3 on facade). I wonder if I can consider just one of them in the middle and simulate just that zone instead of all, and consider interior walls as adiabatic? Model(2) instead of (1) in the picture :

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If It is OK, Why the energy outputs for the middle zone are different?

Many thanks for your response in advance @Neal Kruis, @Annie Marston @Aaron Boranian

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@Moheet there are two posts asking about adiabatic walls in EnergyPlus already on Unmet Hours here and here. Do these answer your question?

Aaron Boranian gravatar imageAaron Boranian ( 2020-09-28 11:44:33 -0500 )edit

@Aaron Boranian Yes, correct. I've read the related topics. They are different from my question

Roheet gravatar imageRoheet ( 2020-09-28 12:04:46 -0500 )edit

@Moheet what specific outputs are you comparing between the two cases? And you are right, the two posts don't ask the exact same question as you but they explain the calculations that are used for the "Adiabatic" boundary condition (Model 2) that are different from those used for the "Surface" boundary condition (Model 1).

Aaron Boranian gravatar imageAaron Boranian ( 2020-09-28 12:12:09 -0500 )edit

@Aaron Boranian Thanks for your prompt response. Annual Energy for the middle zone is calculated. So as you mentioned these two are different and are not replaceable. Right? I just tried to simplify my model!

Roheet gravatar imageRoheet ( 2020-09-28 12:19:52 -0500 )edit

Reasonably there may be some small differences. What about internal gains, scheduling, sola control systems, HVAC and related controls? Did you checked they are the same for the two? Are the other 8 zones conditioned too?

Ag gravatar imageAg ( 2020-10-02 10:15:14 -0500 )edit