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RE: [EnergyPlus_Support] e+ calculation of AHU minimum damper position in multizone system with VAV termi




Dear Jean,

I am not quite certain that I understand your question ? but I?ll give an answer and you can tell me if I?ve helped?

·         As you know the amount of outdoor air is calculated by the E+ sizing objects and can also be manually entered.

·         As in real life, if you provide a specific amount of outdoor air to a single air system which serves several zones, the fraction of outdoor air which is part of the air loop (e.g., 10%) at the fan is the same fraction delivered to every zone.  In this example, 10% of the airflow to every zone is outdoor air.

·         If you truly need to have very different outdoor air fractions in each zone, you must define a separate air loop for these zones with the correct amount of outdoor air in each zone.

·         Alternatively, a DOAS is commonly used to provide the minimum outdoor air flow to each zone (plus a zone heating / cooling component such as radiator, fan coil, etc.)




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