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Modeling an economizer in OpenStudio with a unitary system

asked 2015-08-07 15:59:46 -0500

I was trying to model an air loop in OpenStudio which contains an outdoor air system and a Unitary system. When I try to enable economizer control in the outdoor air system, I am supposed to add a mixed air setpoint manager at the mixed air node as shown in the picture. In the mixed air setpoint manager, I am supposed to set the fan inlet and outlet node. However, these nodes are internal to the unitary system and not visible to me in the diagram. In this situation, is there a way to know the node names? and do they even show up in the node selection drop down list?

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answered 2015-08-07 17:07:24 -0500

updated 2015-08-07 17:08:06 -0500

In OpenStudio you can leave all the SetpointManager:MixedAirs off of the loop and they will automagically be created for you upon translation to IDF. At this time, the nodes inside of the unitary system are accessible to the translator and can be setup correctly. This should be working correctly for unitary systems as of 1.7.0 or greater, per the closure of this issue by @Kyle Benne.

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Thanks for the quick reply. I found that the problem with my model as shown in the diagram is that a setpoint manager is missing at the air loop outlet. Once I added that setpoint manager, the translator automatically added the mixed air setpoint manager at mixed air node.

TiejunWu's avatar TiejunWu  ( 2015-08-07 23:34:09 -0500 )edit

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Asked: 2015-08-07 15:59:46 -0500

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Last updated: Aug 07 '15