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Performance curve of Fan:ZoneExhaust

I modelled a Fan:ZoneExhaust object. I used EMS and made the airflow variable by linking with a variable volume supply fan. The simulation result shows that the airflow rate and electricity of Fan:ZoneExhaust became variable, but what performance curve is this fan electricity based on?

Unlike Fan:SystemModel and Fan:Variable, Fan:ZoneExhaust does not have an input field of Electric Power Function of Flow Fruction Curve Name.

Keigo's avatar
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Keigo
asked 2022-07-21 21:38:44 -0600
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As described in the Engineering Documentation, "The exhaust fan model is similar to, but simpler than, the models used for air system fans. The electric power calculation is simplified and uses a constant overall efficiency." So the electricity usage is simply calculated as: FanPower = VolumetricFlowRate * PressureRise / TotalEfficiency.

shorowit's avatar
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shorowit
answered 2022-07-24 11:43:35 -0600
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Thank you for your answer. Then, FanPower is directly proportional to FlowRate becuase PressureRise and TotalEfficiency are considered constant values in this object.

Keigo's avatar Keigo (2022-07-24 12:26:31 -0600) edit
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