Relation between HP and Ton refrigeration??

Discussion in 'HVAC Heating & Cooling' started by shahnaimath, Sep 3, 2011.

  1. shahnaimath

    shahnaimath New Member

    Messages:
    25
    Location:
    Saudi Arabia
    Hello...

    Is there any conversion for HP(Horse power) to TON Refrigeration..

    I came to know that 1 Hp = 0.81 TR = 746Kw,

    But I need HP of motor here.. the above related Hp I suppose is for Compressor refrigerant i.e R22
  2. nukeman

    nukeman Nuclear Engineer

    Messages:
    704
    Location:
    VA
    1 ton = 12,000 BTU/hr

    1 HP = 2544 BTU/hr

    1 ton = 4.716 HP

    However, the actual work that the compressor does depends on the design (EER, SEER, etc.). 1 ton means that it moves 12,000 BTU/hr of heat, but the amount of electrical energy required to move that amount of heat totally depends on the design of the system.
  3. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    A btu is the amount of energy it takes to raise the temperature of one pound of water, one degree. From the "old days" air condioning was also measured in tons, meaning the cooling power of one ton of ice over a 24 hour period. Somehow, it came to pass that one ton of air conditioning equated to 12,000 BTU. This is in the Book of Algore, or something like that.
    I don't think you could make a direct correlation of tons of A/C to HP of a motor, because that ignores the efficiency of the system. In the 8 SEER world, a 2 ton unit may well have used a 25,000 or 26,000 BTU compressor. In the 10 SEER world, that became more like 22,000, and in the 13 SEER world, it is not unusual to find a 2 ton unit using a 18,000 BTU compressor.
  4. nukeman

    nukeman Nuclear Engineer

    Messages:
    704
    Location:
    VA
    The "ton" unir comes from this:

    latent heat of fusion for ice at 32F (energy it takes to make it a solid) = 144 BTU/lb

    1 ton = 2000 lb

    2000 * 144 BTU/lb = 288,000 BTU to make 1 ton of ice

    To create 1 ton of ice a day:

    288,000 BTU / 24hr = 12,000 BTU/hr
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