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Performance curve of Fan:ZoneExhaust

asked 2022-07-21 21:38:44 -0500

Keigo's avatar

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.

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answered 2022-07-24 11:43:35 -0500

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.

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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 -0500 )edit

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Asked: 2022-07-21 21:38:44 -0500

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Last updated: Jul 28 '22