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How System Ventilation Requirements for Cooling is calculated?

asked 2017-11-06 19:11:50 -0500

katsuya.obara's avatar

I am modelling system 8 for LEED baseline case using OpenStudio v2.1.0.
I applied create baseline building measure to the proposed case which also use VAV system with water cooled chiller.
However, when I get the result, it seems that system doesn't introduce any outdoor air because system population is 0 as shown below.
image description
However, when I look at Zone Ventilation Parameters, they counted zone population which should require outdoor air as shown below.
image description
For me, this seems contradiction.
Can anyone tell me how these parameters are correlated and what I should change in order to introduce outdoor air?

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answered 2017-11-08 10:07:35 -0500

90.1 Appendix G requires that the baseline model have the same ventilation rates as the proposed model. The Create Baseline Building Measure doesn't add any ventilation to the proposed model, it simply uses whatever ventilation rates you've included for each space type via DesignSpecification:OutdoorAir objects. So if your baseline model has no DesignSpecification:OutdoorAir objects, your proposed model will have no ventilation.

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Asked: 2017-11-06 19:11:50 -0500

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Last updated: Nov 08 '17