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Set a space as Unconditioned

asked 2015-07-17 12:18:08 -0500

updated 2015-11-12 15:01:02 -0500

How do you set a space as unconditioned in OS?

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answered 2015-07-17 12:26:19 -0500

I typically create an "unconditioned" thermal zone without thermostats or ZoneHVACEquipment and then assign all unconditioned spaces to it.

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@MatthewSteen, I assume you only put in same zone when they are similar adjacent spaces. There may be many times you don't want them in the same zone either because they are not adjacent, or they have very different (internal or external) loads.

David Goldwasser gravatar image David Goldwasser  ( 2015-07-17 13:49:40 -0500 )edit

I was thinking to not assigning the space to a HVAC system.

obuchely gravatar image obuchely  ( 2015-07-17 15:01:09 -0500 )edit

@David Goldwasser - I see your point but have not typically considered the inter-space heat transfer to be significant enough in a commercial (internal load driven) building to warrant that level of detail. It's a simplification but one I think is reasonable. If I were doing an existing building model I would probably take these small details into consideration.

MatthewSteen gravatar image MatthewSteen  ( 2015-07-17 17:54:51 -0500 )edit

@obuchely - that will work. According to EnergyPlus a zone is considered "conditioned" if it has a piece of equipment assigned to it (Fan:ZoneExhaust, ZoneHVACEquipment:*, etc.) just be mindful that each space must (I think) be assigned to a thermal zone or it will cause an EnergyPlus error.

MatthewSteen gravatar image MatthewSteen  ( 2015-07-17 17:56:09 -0500 )edit

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Asked: 2015-07-17 12:18:08 -0500

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Last updated: Nov 12 '15