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Convert EER to rated COP in HVACTemplate:System:UnitarySystem

asked 2014-12-29 02:51:05 -0500

Xandrika's avatar

updated 2015-07-11 13:07:18 -0500

As I understood the rated COP is the values that define efficiency of the system. I/O reference says that: The gross COP should NOT account for the supply air fan. However, in South Asia manufactures use more the EER and the Indian Star Labeling as efficiency indicator. Is there a way to convert EER into COP? If so, HOW?

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answered 2014-12-29 10:30:10 -0500

The EER you are referencing is actually a metric (SI) version of EER and is expressed in W/W. To remove the fan I would suggest you use the equation:

COP= (EER + R) / (1 - R)

"Where R is the ratio of supply fan power to total equipment power at the rating condition. Typical values of fan power ratio R for a commercial rooftop unit vary from about 0.05 to 0.17, depending on specific product design choices. For this analysis, a ratio of 0.12 is assumed as being representative of the broad class of products" (PNNL-20405)

For EER that is Btu/W the equation above would be expressed as:

COP= (EER/3.413 + R) / (1 - R)

Computing the value for R for the specific piece of equipment is best.

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Asked: 2014-12-29 02:51:05 -0500

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Last updated: Dec 29 '14