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Thread: Subcooling

  1. #51
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    Re: Subcooling



    Quote Originally Posted by chillyblue View Post
    Also in theory then you can only subcool liquid to a temperature to which its surrounding area is. (unless you insulate everything).

    In my example then, i will not be able to subcool the liquid any lower than the air off temperature of the fans that is hitting the receiver(+21degC), because the liquid in the reciever will evaporate and instanly decrease any additional subcooling that had been achieved, altering pressures and temperatures to balance the high side. (discharge pressure 135psi / 24deg C)so in effect subcooling of 3 deg.C would be about the maximum i could achieve without the use of artificial subcooling, or without insulating everything.

    CB
    That would be true... if your high side gauge were reading correctly.

    Allow a jug of R22 to warm to room temperature. Hook your high side gauge to it. The pressure should agree with the temperature.
    Last edited by Gary; 18-04-2008 at 03:45 AM.



  2. #52
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    Re: Subcooling

    Thanks Gary i'll give that a go
    By the way i checked all my thermistors and thermometers yesterday so i know there right.

    CB

  3. #53
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    Re: Subcooling

    Hi Gary,
    where can I buy your books? Do you have web site? You may like to answer via email to colin@reeson.net

  4. #54
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    Re: Subcooling

    Click on my name (to the right of my picture), then click on "Visit Gary's Homepage".

  5. #55
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    Re: Subcooling

    hi can any one explain me about the different process take place when refrigerant flows through a condenser with a picture?

  6. #56
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    Re: Subcooling

    Hi Gary

    Would you be kind enough to explain how I would be able to partially close part of a condenser off, as per your explanation earlier in this thread.
    sparrow.
    Always easy on the eye.

  7. #57
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    Re: Subcooling

    chilly blue
    .
    Remember, just because you
    don’t have bubbles in your sight
    glass doesn’t mean you have subcooled
    liquid at the inlet to your
    expansion valve!
    Measure it using your gauge,
    thermometer and comparator


    Service Matters. This one is
    dedicated to subcooling and a
    clever device that can
    measure minute levels of
    flash gas, an early indicator of
    loss of subcooling.
    Often in the winter
    months you hear the term
    ‘over condensing’. This is a
    myth, as you cannot over
    condense a refrigerant. The
    problems related to low ambient
    are often due to logging of
    refrigerant in the condenser
    leading to low liquid levels in the
    receiver.
    The Gaslok is a clever device
    which can tell the state of the refrigerant
    in the liquid line. It
    does not require invasive installation
    - it is just clamped around
    the outside of the pipe. It passes
    and minutely analyses ultra sonic
    signal through the pipe and
    refrigerant.
    It can detect even a very small
    amount of flash gas in the liquid
    and thus give a good warning
    that the system is not
    performing efficiently.
    Cambridge
    Refrigeration Technology.
    These tests showed that the
    Gaslok can detect down to 5%
    gas in the liquid line - you would
    barely be able to see these few
    bubbles in a liquid line sight
    glass.
    The device could be used in
    two ways:
    To continuously monitor a system
    and to provide an alarm in
    the event of subcooling disappearing;
    As a commissioning tool, for example
    to check that a system is
    adequately charged.
    Gaslok is currently being field
    trialled by A B Technology on its
    own test rig. Further field trials
    are planned.
    The information produced
    will be evaluated to determine
    how the device can be used as a
    useful indicator of system
    problems.
    Whatever the results of the
    trial, we know that this is a useful
    commissioning and diagnosis
    tool because you don’t usually
    get a sight glass where you need
    it - at the expansion valve.
    Service Matters is produced for the IOR Service Engineers Section by Cool Concerns Ltd
    If you have any feedback please contact Stephen Benton
    Email: steve@coolconcerns.co.uk Phone & Fax: 01323 768768
    Always easy on the eye.

  8. #58
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    Re: Subcooling

    Quote Originally Posted by sparrow View Post
    Hi Gary

    Would you be kind enough to explain how I would be able to partially close part of a condenser off, as per your explanation earlier in thi
    s thread.
    sparrow.
    Take some cardboard or PVC foil, and stick to suction side of condenser. Then adjust how much is covered with that till you got desired pressure.

  9. #59
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    Re: Subcooling

    Hi all

    What effects on subcooling would you expirence if

    1. the systems condenser was oversized.

    2. the systems condenser was undersized

    CB

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