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  1. #1
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    refrigeration capacities



    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.



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    Re: refrigeration capacities


  3. #3
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    Re: refrigeration capacities

    Hi, question mark

    Quote Originally Posted by question mark View Post
    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

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

  4. #4
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    Re: refrigeration capacities

    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/Art...Horsepower.PDF

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

  5. #5
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    Re: refrigeration capacities

    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.

  6. #6
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    Re: refrigeration capacities

    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.
    Now in Redvers Sask.

  7. #7
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    Re: refrigeration capacities

    Quote Originally Posted by passandscore View Post
    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/Art...Horsepower.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!
    Now in Redvers Sask.

  8. #8
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    Re: refrigeration capacities

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

  9. #9
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    Re: refrigeration capacities

    it can be a mind bender eh! energy convertions can get confusing.
    Now in Redvers Sask.

  10. #10
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    Re: refrigeration capacities

    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

  11. #11
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    Re: refrigeration capacities

    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!
    Now in Redvers Sask.

  12. #12
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    Re: refrigeration capacities

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

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