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  1. #1
    wcam3's Avatar
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    Changing length of the evaporating coil



    Dear members,
    I am upgrading my existing cooling unit. Presently the unit has 750 BTU compressor, which I am increasing to 3600 BTU. The evaporating coil is presently of SS, 5/16" (8 mm) dia.
    Coil length is 8 metres
    Evaporating coil temperature is -7 degrees
    The ambient temperature is around 40 degrees
    The condensing temperature is around 55 degrees

    Please suggest by how many times I have to increase the length of the evaporator coil to match the new compressor rating.
    If any one can suggest the method to calculate the length of the evaporator coil based on these parameters, I would be highly obliged

    Thanks and regards
    Giridhar

    PS: The present design is working perfectly.



  2. #2
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Changing length of the evaporating coil

    Quote Originally Posted by wcam3 View Post
    PS: The present design is working perfectly.
    So why the change ?
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    Re: Changing length of the evaporating coil

    I agree with Brian. Why not rather install a new system in parallel with the existing, perfectly-functioning system? Surely this is a lot less risky?
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  4. #4
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    Re: Changing length of the evaporating coil

    Quote Originally Posted by desA View Post
    I agree with Brian. Why not rather install a new system in parallel with the existing, perfectly-functioning system? Surely this is a lot less risky?
    There is a space constraint to put a parallel system. I plan to replace the present compressor with the new one.

    Thanks

  5. #5
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    Re: Changing length of the evaporating coil

    I repeat the question, why?
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    Re: Changing length of the evaporating coil

    Quote Originally Posted by wcam3 View Post
    There is a space constraint to put a parallel system. I plan to replace the present compressor with the new one.

    Thanks
    You cannot replace compressor and evaporator only. You need to match every component of system, therefore you cannot done that by changing parts of system. Especially not by 5 times increase in capacity!
    Forget about that!
    Last edited by nike123; 02-09-2009 at 06:41 AM.
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    Re: Changing length of the evaporating coil

    As per above...
    You need to change the following:
    Compressor
    Condenser
    Evaporator
    Condenser fans
    Evap fans
    All piping
    All valves
    Distributor
    Expansion valve
    Liquid receiver
    Suction accumulator

  8. #8
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    Re: Changing length of the evaporating coil

    i also strongly recomend changing electrical cables so you dont overload the one you have

  9. #9
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    Re: Changing length of the evaporating coil

    Hi there,

    Everything said perfectly by others.
    Increasing compressor power means increasing everything else like mentioned above.
    I suggest you think again before making such changes.
    Cheers
    Even Einstein Asked Questions

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