# Thread: Compressor btus/ compressor horsepower

1. Is there a coversion between compressor btus to comp. horsepower?

2. A comp will pump a different amount of btu's for every different SST it's used for. No conversion.

3. What's an SST?

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what is normally called an R22 5 HP compressor
can produce anyhere from 18,000 btuh to 72,000 btuh
depending on conditions which are
1. Condensing Temp
2. Evap temp (saturated suction temp - SST)

so sorry, no conversion HP to BTUH
Copeland says HP not a factor in compressor design
I think they are telling the truth

you need to look at a curve sheet to understand
this. A Copeland wholesaler will have curve sheets
or you can register at http://www.copeland-corp.com and

5. Thanks alot man. I've been to copeland's site, I think it could have been designed better, tough to navigate.

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## rule of thumb

rule of thumb, and is rough only, 1 hp to 1 ton for air conditioning, 1 ton to 2 hp refrigeration, and 1 ton to 3 hp for freezer

7. Professionals do not use "Rule of Thumb", they use specifics.

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## HP<->TONS

Try to think of it as compression/ratio. Is it harder to compress 2-1 or 9-1 ? Thus, HP. If you are comprssing, let's say, R22, in a walk-in,from 50 deg to 110 degs the diff. is 60. If you are going from 30 to 110 the diff. is 80. Give or take given entropy/enthapy curves... it takes more power to move the juice from 9-1 than from 2-1.

m

[Edited by michael3 on 10-11-2005 at 08:44 PM]

9. ## Re: HP<->TONS

Originally posted by michael3
Try to think of it as compression/ratio. Is it harder to compress 2-1 or 9-1 ? Thus, HP. If you are comprssing, let's say, R22, in a walk-in,from 50 deg to 110 degs the diff. is 60. If you are going from 30 to 110 the diff. is 80. Give or take given entropy/enthapy curves... it takes more power to move the juice from 9-1 than from 2-1.

m
That's cool how you took 3 different ideas to confuse it some more.

10. ## Re: Re: HP<->TONS

Originally posted by jerrycoolsaz
Originally posted by michael3
Try to think of it as compression/ratio. Is it harder to compress 2-1 or 9-1 ? Thus, HP. If you are comprssing, let's say, R22, in a walk-in,from 50 deg to 110 degs the diff. is 60. If you are going from 30 to 110 the diff. is 80. Give or take given entropy/enthapy curves... it takes more power to move the juice from 9-1 than from 2-1.

m
That's cool how you took 3 different ideas to confuse it some more.
ROTFLMAOPMP.

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lets take another approach, 1hp=746 watts, 1watt=3.412 btu
746x3.412=2545.352btus. this only applies to the heat output of the motor.

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