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  1. #1
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    Talking About system balancing



    Hello,

    I am thinking about system balancing.

    What we do with capillary tube if we use the same compressor for another unit with smaller heat exchanger, should we lengthen or shorten it to get maximum capacity.
    For charging I usually adjust the superheat.

    Appreciate any logical explanation.



  2. #2
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    Re: About system balancing

    .

    When you use a capillary tube you charge the refrigerant to an exact weight
    and that is because the capillary tube has no control.

    The weight of refrigerant is designed to be just enough so the liquid is
    turned back to vapour inside the evaporator just before it exits the evaporator.

    If there was too much liquid, the liquid would spill out of the evap and flood back to the comp.
    If there was too little liquid, there would not be enough inside the evaporator so performance will suffer.

    The balance is having the correct amount for when the system is at normal operating temperature.

    If you change the size of the heat exchanger all your calculations will be wrong.

    Your capillary may still be ok but you would put less refrigerant in.

    It is not a straight forward, easy to answer solution though, because you
    would have to redesign the system and then run on test to prove all is ok.

    Regards

    Rob

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

  3. #3
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    Re: About system balancing

    Hi
    in order to design a balanced system ; compressor should be selected 7% evaporator capacity. You cannot use the same compressor for a smaller capacity heat exchanger as that would lead into liquid flood back into the compressor

    Regards,
    Sendhil

  4. #4
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    Re: About system balancing

    Thank you Rob and Sendhil for your comment.

    I am working in repair company for commercial refrigerator, and dealing with quick fixing. Howeaver also interesting in design, could you give any link about detailed design.

  5. #5
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    Re: About system balancing

    Quote Originally Posted by sendhilkmar View Post
    Hi
    in order to design a balanced system ; compressor should be selected 7% evaporator capacity. You cannot use the same compressor for a smaller capacity heat exchanger as that would lead into liquid flood back into the compressor

    Regards,
    Sendhil
    Not if you charge less refrigerant
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

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