OpenStudio System Sizing Settings

I was modeling a simple air loop in OpenStudio, in the exported EnergyPlus IDF file, the "Sizing:System" object shows that the "100% Outdoor Air in Cooling" and the "100% Outdoor Air in Heating" were automatically set to "Yes". I think this would lead to significant over sizing of the cooling and heating coils. However, I did not find a place in the OpenSutdio user interface that I can specify these two fields to "No".

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Clicking the dotted line separating the Supply and Demand sides of the air loop exposes the drop-down fields to change these inputs in the Edit pane:

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ericringold

answered 2015-08-11 11:36:26 -0500

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Yes the fact that we are oversizing because of this setting has not gone unnoticed. Is it time to reconsider this default?

Kyle Benne (2015-08-11 16:32:31 -0500) edit

@Kyle Benne - Interesting question IMO; this simple control (ON/OFF) is helpful for systems that use a large % of OA (gyms, auditoriums, etc.) as well as for identifying an upper-limit on potential equipment size. That being said, having it default to ON may not be the best if that majority of users either don't require/understand this control setting.

NickC (2015-08-17 15:33:00 -0500) edit

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OpenStudio System Sizing Settings

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OpenStudio System Sizing Settings