Output "Standard Rated Net COP" in OpenStudio different from "Input Rated COP" in EnergyPlus report

asked 2016-02-03 09:24:04 -0500

updated 2020-01-27 18:47:02 -0500

I'm setting efficiency (COP) of some DX Cooling Coil Single Speed in the AirLoop Packaged Rooftop Heat Pump equipment for compliance Baseline of ASHRAE 90.1.

I'm setting the Rated COP field to the desired efficiency according to the standard.

However, when opening the EnergyPlus results, in the report Equipment Summary, the Standard Rated Net COP is different, lower than what I had set the input.

This only happens in the DX Cooling Coils, but does not happen in DX Heating Coils, where the outputs are the same as inputs.

Could someone help me understand why this difference and how to properly adjust the inputs according to the standard.

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The rated COP at OS (same as E+) input is Gross (subtract fan heat gain) while standard rated COP is included fan heat.

ngkhanh's avatar ngkhanh  ( 2016-02-03 09:53:22 -0500 )edit

Thank's @ngkhanh !

Do you know if the fan Rated included in rated COP is the Fan AirLoop or Fan of the internal condenser equipment?

Geraldo Pithon's avatar Geraldo Pithon  ( 2016-02-03 10:09:29 -0500 )edit

All fan were subtracted consumption, are supply air loop fan. Condenser fan was included in COP them-self.

ngkhanh's avatar ngkhanh  ( 2016-02-03 12:07:06 -0500 )edit