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  1. #1
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    Coefficient of performance



    If the condensing temperature and evaporating temperature is constant but the power of the compressor ( driven by gas turbine ) changed . Can be assume that the coefficient of performance is constant ?



  2. #2
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    Re: Coefficient of performance

    .

    No.

    The coefficient is a calculation of the energy imparted through the
    compression process divided into the energy absorbed or rejected
    through the heat exchanger.

    COP = RE/WD
    COP = THR/WD

    RE being refrigeration effect, heat absorbed by evap.
    THR being total heat rejected in cond.
    WD being work done in compression process.

    Rob

    .
    .. ... -. .----. - / -- --- .-. ... . / -.-. --- -.. . / --. --- --- -..

  3. #3
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    Re: Coefficient of performance

    Quote Originally Posted by Rob White View Post
    .

    No.

    The coefficient is a calculation of the energy imparted through the
    compression process divided into the energy absorbed or rejected
    through the heat exchanger.

    COP = RE/WD
    COP = THR/WD

    RE being refrigeration effect, heat absorbed by evap.
    THR being total heat rejected in cond.
    WD being work done in compression process.

    Rob

    .

    ok

    If coefficient of performane is 2 . It means the refrigerant removes 2 units of heat for each unit of energy consumed , right ?

    So If the work input is 1 kW the refrigeration effect is 2 kW

    Now , if the work input 2 kW , is the refrigeration effect will be 4 kW ??

    If that true , It means that the coefficient of performance is constant ????

  4. #4
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    Re: Coefficient of performance

    Quote Originally Posted by chemicalENG View Post
    ok

    If coefficient of performane is 2 . It means the refrigerant removes 2 units of heat for each unit of energy consumed , right ?

    So If the work input is 1 kW the refrigeration effect is 2 kW

    Now , if the work input 2 kW , is the refrigeration effect will be 4 kW ??

    If that true , It means that the coefficient of performance is constant ????
    OK, sorry in that context "yes".

    COP is a ratio, nothing more so inputs and outputs can change but
    the ratio could remain constant.

    Rob

    .
    .. ... -. .----. - / -- --- .-. ... . / -.-. --- -.. . / --. --- --- -..

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