how and where to specify outdoor air in OS?

asked 2019-02-11 19:56:08 -0500

Ranjani gravatar image

updated 2019-02-11 22:09:49 -0500

Hello everyone,

I am working on an energy model that has 50% of fresh air and 50% for return air. I changed the input from 1 to 0.5 under OS:Sizing: System - Minimum System Air Flow Ratio, but not sure if that reduced the OA % to 0.5.

Here are my questions- - How and were to specify % OA in Open studio? - Which report should I check to see if the changes have been applied?


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I cannot think of any other options to vary the outdoor air %. For your second question, you could look at "Air system Outdoor Air Flow fraction" in other output variables tab to verify your inputs.

akr gravatar imageakr ( 2019-02-13 08:34:14 -0500 )edit

@akr thanks for your reply. I did check the engineering checks for cooling in 'Air Loop Summary report', it shows only 12-13% even though I enter 0.5 under "OS:Sizing: System - Minimum System Air Flow Ratio" Is that correct or which other reports can I check? Thanks

Ranjani gravatar imageRanjani ( 2019-02-17 09:21:09 -0500 )edit

Check under OS:Controller:OutdoorAir where there is option to assign based on schedule. I haven't done this yet, so I'm only guessing the possible solution per my knowledge.

akr gravatar imageakr ( 2019-03-04 14:41:36 -0500 )edit