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[EnergyPlus_Support] Re: OutdoorAir:Mixer questions



Hi Dr. Li,
I find the "environment tank" analogy very interesting. Particularly, that the relief air is equal to the ODA flowing into the ODA system. In real life as in the simulation more than 1 system may be present, e.g. AHU serves supply air to both office and kitchen zones, but the kitchen has it's own fan:zoneexhaust to the outdoors.

In this case the relief air of the AHU is not equal to the supply air, but the "environment tank" remains balanced as the kitchen also exhausts to it.

Now when kitchen makeup air is the combination of supply air and infiltrated via the office zones, it becomes tricky. As the demands of the kitchen and the offices are independant, it may occure that the flow is unbalanced at any possible timepoint. Should one not wish to use an AFN crack between kitchen and office and office and outdoors, is there a way you would suggest to address the unbalanced flow?

e+ simply issues the warning that the unbalanced air is not flowing in from outdoors and may decrease the accuracy of results.



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