Tayters

05-12-2012, 11:05 PM

I've been asked to work out the COP of a VRF system.

I've gone through the design manual (Fujitsu) and following the example you need to work out capacity of indoor at design conditions to get the diversity, then follow the outdoor unit tables at the diversity just worked out (maybe interpolate to get the correct value) and design conditions to get outdoor capacity.

Lovely, then I can work out COP quite easily but do I have to take into accout the multiplying factors for pipe length and defrosting. This is the bit I'm not sure on.

To work out COP I just divide outdoor capacity by input power. Would I have to get my outdoor capacityat design conditions, multiply by the correction value then use this as the capacity but keep input power the same?

I've attached the pages from the manual (sorry seperate due to the size) if that helps this all make a bit of sense.

Many thanks,

Andy9839

I've gone through the design manual (Fujitsu) and following the example you need to work out capacity of indoor at design conditions to get the diversity, then follow the outdoor unit tables at the diversity just worked out (maybe interpolate to get the correct value) and design conditions to get outdoor capacity.

Lovely, then I can work out COP quite easily but do I have to take into accout the multiplying factors for pipe length and defrosting. This is the bit I'm not sure on.

To work out COP I just divide outdoor capacity by input power. Would I have to get my outdoor capacityat design conditions, multiply by the correction value then use this as the capacity but keep input power the same?

I've attached the pages from the manual (sorry seperate due to the size) if that helps this all make a bit of sense.

Many thanks,

Andy9839