EER to COP conversion

Ciaran McCabe

Director

Passive Dynamics Sustainability Consultants

LEEDuser Basic Member

12 thumbs up

January 7, 2016

Hi, I am trying to document the efficiency for comms room AC units and a data centre down flow AC units. As we are in Europe the efficiency is quoted by manufacturers in EER. ASHRAE 90.1 2007 Table 6.8.1D refers to COP. Does anyone have an accepted conversion. e.g an EER will have a COP of ???

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 01/07/2016 - 14:32

COP = (EER)/3.413

Ciaran McCabe

Director

Passive Dynamics Sustainability Consultants

LEEDuser Basic Member

12 thumbs up

Thu, 01/07/2016 - 14:45

Thanks. Is there any exemptions for smaller AC units. I have some AC units that have an EER of 3.57 and this would equate to a COP of 1.046 which is less than the minimum performance for LEED (2.49). I can't get units with a COP of 2.49 as this would mean an EER of 8.5 which is not available in the marketplace ? Is my interpretation wrong ?

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 01/08/2016 - 20:32

I am not aware of any exceptions for small air conditioners. The EER of the units you mention is well below what is legal in the US. These minimum efficiencies are mandatory for LEED projects.