What should I use to calculate COP? EER or IEER?

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I would like to input "Rated Cooling COP" of "AirConditioner:VariableRefrigerantFlow". The engineer provides both EER and IEER for the unit. Which one should I use to calculate COP? As I know, IEER shows the performance of part load. However, the EER of this unit only shows the unit performance when VRF is operating 99%-100% of its full-size. I think most of the time, the unit will operate less than 98% of its full-size. Does it mean that I should use IEER to calculate the COP but not EER? Thanks.

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Yan

asked 2015-09-17 16:55:55 -0500

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__AmirRoth__

updated 2015-11-10 14:48:08 -0500

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You need to use EER at the rating condition to get the Rated Cooling COP.

As part as capturing part load performance, that's what performance curves are all about!

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Julien Marrec

answered 2015-09-17 16:58:50 -0500

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You have to take in account that EER most of the time refers to packet performance. It includes compressors plus fans. COP often refers to compressor performance only. The best way for my is to get the technical data from the manufactured. It will show you at full load consumptions for compressor and fans. So you can be sure that you are modeling correct. For the part load you have to use the part load curve.