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ZoneHVAC:PackagedTerminalAirConditioner with Variable speed fan

asked 2018-10-04 10:29:41 -0500

Charalampos Angelopoulos's avatar


I want to design a system with a ZoneHVAC:PackagedTerminalAirConditioner object and control the fan speed based on the cooling demand, so for instance if the cooling demand is greater than XXX [W] operate the fan in 75% of its maximum speed, otherwise in 40%. However, based on the I/O document I can use either a FAN:ConstantVolume or a Fan:OnOff which don't allow me to control them based on the cooling demand. Is there any way to control the system in this way?

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answered 2018-10-04 20:29:32 -0500

You are correct in that the PTAC does not allow a variable-speed fan. You might look at the AirloopHVAC:UnitarySystem object since that object can use a variable-speed fan and can be either connected as zone equipment or used as a single-zone air loop.

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Thank you for the help!

Charalampos Angelopoulos's avatar Charalampos Angelopoulos  ( 2018-10-05 03:49:41 -0500 )edit

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Asked: 2018-10-04 10:29:41 -0500

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Last updated: Oct 04 '18