refrigeration capacities

[question mark]

hi guys,

i am just going through the suppliers catalog. have always wondered , but never studied
what is the relationship between compressor horse power and refrigeration capacities in watts ?
would really appreciate some good links for related studies.
many thanks to this website, and people keeping it.
Thanks.

[FreezerGeezer]

Try using the search engine:
http://www.refrigeration-engineer.com/forums/showthread.php?1653-Horsepower-and-Kilowatts

[Josip]

Hi, question mark :)


hi guys,

i am just going through the suppliers catalog. have always wondered , but never studied
what is the relationship between compressor horse power and refrigeration capacities in watts ?
would really appreciate some good links for related studies.
many thanks to this website, and people keeping it.
Thanks.

http://www.rapidtables.com/convert/power/watt-to-hp.htm

Hope this will be of some help to you ...

Best regards, Josip :)

[passandscore]

Horsepower is the U.S. Conventional unit of measure for mechanical power where watts is the SI Metric unit of measure.

1hp = 746W
1W = .0013hp

1 Refrigeration Ton = 2000 Pounds x 144 BTU per Pound / 24 hours =
12,000 BTU's per Hour

With the BTU value you can determine how much mechanical work is going to be needed.

1 Refrigeration ton = 3,515 Watts or 4.6hp
(Heat that needs to be removed) (Mechanical power needed to remove the heat)

http://www.innovativethermal.com/Articles/Definition%20of%20Refrigeration%20Horsepower.PDF

http://www.unit-conversion.info/power.html

[chemi-cool]

Refrigeration capacity has nothing to do with horse power, It has to do with evaporating and condensing temperatures.
HP is only the input power of the electric motor.

[The MG Pony]

colder you go the more Hp you need for a given lift at a fixed capacity

so other then that Hp meands nothing in terms of capacity, just the temp lift we need to push.

[The MG Pony]

Horsepower is the U.S. Conventional unit of measure for mechanical power where watts is the SI Metric unit of measure.

1hp = 746W
1W = .0013hp

1 Refrigeration Ton = 2000 Pounds x 144 BTU per Pound / 24 hours =
12,000 BTU's per Hour

With the BTU value you can determine how much mechanical work is going to be needed.

1 Refrigeration ton = 3,515 Watts or 4.6hp
(Heat that needs to be removed) (Mechanical power needed to remove the heat)

http://www.innovativethermal.com/Articles/Definition%20of%20Refrigeration%20Horsepower.PDF

http://www.unit-conversion.info/power.html

you may wish to look closely at a 1ton window air con ;) you'll find a very small hp compressor hiding in there! Now if we where taling -180 on a brute force single stage system perhaps we'd need near 4hp!

[passandscore]

Yeah, I realized my mistake hours after posting the reply. Disregard comment with apologizes.

[The MG Pony]

it can be a mind bender eh! energy convertions can get confusing.

[question mark]

yea, this is what i wanted to know, surely i didn't draft my question properly
what i wished to know was that how do we input say 1/2 horse power compressor and get 567 watts evopating (input vs output ) capacities, and then how do we make selection for the right txvalve and the orifice size. just looking at suppliers catalogs. what are the different things needs to be considered for selecting condesing units etc.
just wanted to know a little more then just being a part or components changer.
thanks guys

[The MG Pony]

basicaly think of it like a water pump, the higher the lift at a fixed volume, the more powerfull of a pump we need or the more stages we need to reduce the given lift seen to any one of the stages.

to design a system you start at the evap and work your way back.

room load by its self, then you add the product load, then a safety factor of say 25%

then you select the tvx that matches the load and evap you chose, then you size the condensing plant that will handle the load and the ambient temps you'd expect to see

Now for that 1/2Hp @ 567w that is at a low evap temp look at its higher temps and you'll see that number go way up as there is les "lift" compression ratio

Fyi I typed this in the morning befor coffee so take it as you will, now for coffee!

[question mark]

thanks a lot mate , i m also reading it before going to work in 30 seconds , hahah thankss again