Outdoor Air Summary Report is 40% of the Outdoor Air setted?
Why Outdoor Air Flow in the Outdoor Air Summary Report is always 40% of the Outdoor Air setted?
I have a model with system Package Rooftop and the Outdoor Air System is setted for a minimum and a maximum of 153 cfm. Althought, when I calculate the flow in the Outdoor Air Summary Report (ACH x Zone Volume / 60), this is 63 cfm (40%) of I had setted in the Outdoor Air System. This occur in all systems of the model.
Is your airloophvac or fan hard sized?
Hi @Julien Marrec. Thank's for your time. I only seted outdoor air flow hard sized, both in Air Loop as in Outdoor Air System. The fan is configured to autosized.
Are you hardsizing your supply air flow as well, in the OS:AirLoopHVAC?
@gokulram, the Design Supply Air Flow Rate is AutoSized, but the Desgin Outdoor Air Flow Rate is Hard Sized. I inserted a new figure in the question to represent this condition.
I am not sure how that is happening. I am guessing that it maybe the Supply Airflow that is limiting the Outdoor Airflow to that number. I would check the System Summary Report for the value of the Supply Airflow to this AirLoop, and see if it is higher than the outdoor air. If it's not, then the outdoor airflow will be limited by the maximum value of the supply air. Usually autosizing supply air should take care of this, but it is worth a check! Let me know if this helps.