Compressor Rating

[XC] gomeler · 02-11-2006, 08:41 AM

How efficient are compressors on their powerdraw versus output? My compressor is rated at 7.3 amps @ 115 volts = 839.5 watts. There is no way this is a 1hp+ compressor (746 W per HP) What is the efficiency rating on a compressor? ~60%?
One other question, is it possible to have too large of a condenser? I'm tearing into a dehumidifier and I'd just like to use the entire condenser/evaporator unit that came in it, 4 rows deep by 14 rows high. Trying to avoid making mistakes on this build, any help is appreciated.

SoddemFX · 02-11-2006, 10:28 AM

For the power are you looking at max run amps or locked rotor amps?

If you have a certain compressor the amount of power it draws at say -40C evaporation temperature will be much less than if it has an evaporating temp of +5C with the same refrigerant.

Ive always assumed the IHP of a compressor to be given by the running power at a certain evap temperature multiplied by the coefficient of performance (COP) for the refrigerant at that temperature. <-Is this correct?

Tom

_HL4E_HalfLife_ · 02-11-2006, 10:36 AM

Quote:

Originally Posted by gomeler

How efficient are compressors on their powerdraw versus output? My compressor is rated at 7.3 amps @ 115 volts = 839.5 watts. There is no way this is a 1hp+ compressor (746 W per HP) What is the efficiency rating on a compressor? ~60%?
One other question, is it possible to have too large of a condenser? I'm tearing into a dehumidifier and I'd just like to use the entire condenser/evaporator unit that came in it, 4 rows deep by 14 rows high. Trying to avoid making mistakes on this build, any help is appreciated.

7.3amps would be in the area of a 1/2hp to 3/4hp. Look up the specs on it ,it might tell you all you need to know.And yes too large of a condensor can hurt ur system (you may not get a continues stream of liquid at the outlet.)