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  1. #1
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    propane V/s propylene



    can any body tell me that whether propane or propylene will be a better refrigerant for using in a system at -35 degree evaporating temperature??



  2. #2
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    Re: propane V/s propylene

    Assuming -35F and 90F condensing temp


    R-1270 R-290
    Evap -34 -34 F
    Cond 90F 90 F

    Liquid Enthalpy -13.206 261.59 btu/lb
    Vapor enthalpy 97.731 368.2 btu/lb
    Vapor entropy 1.4085 1.3649 BTU/lb-R
    Suction pressure 23.62 18.562 PSIA
    Condening press 199.8 165.58 PSIA

    Compression ratio 8.46 8.92

    Refrigeration effect 110.937 106.61 btu/lb
    Mass flow rate 108.1695 112.5598 lb/hr/ton

    Ideal Compression
    Discharge enthalpy 143.61 141.35 btu/lb

    Compressor work 45.879 43.15 btu/lb
    4962.71 4856.96 btu/hr/ton

    Efficiency 1.95 1.91 hp/ton

    Ideally propane is sightly better, The compression ratio of propane is higher than propylene so the compressor efficiency is lower. Infact they are almost identical.

    You will have to look at the compressor efficiency curves to get a better answer.
    Last edited by Dacosta; 11-02-2010 at 06:51 PM.

  3. #3
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    Re: propane V/s propylene

    Sorry my post killed my formatting

  4. #4
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    Re: propane V/s propylene

    Hi, Dacosta

    ... you can always edit your post and change formatting to make it easier for reading


    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.

  5. #5
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    Re: propane V/s propylene

    Thanks i can edit now but it still takes out all my spaces to put it into nice column like format.

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