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Interaction between ZoneAirBalance:OutdoorAir and ZoneAirMassFlowConservation

asked 2015-07-10 12:21:00 -0500

updated 2017-05-03 19:22:27 -0500

I am slightly confused about the ZoneAirBalance:OutdoorAir object, it seems that the main purpose is to combine infiltration and ventilation air in quadrature rather than as a simple sum. Is that right? If so, is this calculation compatible with the ZoneAirMassFlowConservation object? What about ZoneMixing objects? Are these objects compatible?

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@macumber by 'ZoneAirMassFlowBalance' do you mean ZoneAirMassFlowConservation?

Eric Ringold's avatar Eric Ringold  ( 2015-07-10 17:30:11 -0500 )edit

Yes :-) I'll edit the question

macumber's avatar macumber  ( 2015-07-10 17:33:06 -0500 )edit

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answered 2015-07-10 18:49:27 -0500

updated 2015-07-10 18:53:02 -0500

Regarding the question of whether the ZoneAirBalance:OutdoorAir object is compatible with ZoneMixing objects: I just opened the SingleFamilyHouse_TwoSpeed_ZoneAirBalance.idf example file, which contains a ZoneAirBalance object, and added a ZoneMixing object to supply a constant flow to the living zone from the garage zone.

The model with ZoneMixing runs successfully, and affects the output for 'Zone Combined Outdoor Air Current Density Volume Flow Rate', thus seeming to indeed be compatible. However, I have not confirmed that the results make sense in relation to the zone air balance calculation, just that they ran without error and did 'something'. I'll try to get deeper into it later; hope this helps!

Edit: the two idfs can be found here.

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Thanks Eric this is really helpful!

macumber's avatar macumber  ( 2015-07-11 09:36:35 -0500 )edit

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Asked: 2015-07-10 12:21:00 -0500

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Last updated: Jul 10 '15