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  1. #1
    Join Date
    Jul 2002
    Location
    india
    Age
    50
    Posts
    9
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    0

    chilled water PHE



    all dears.
    good day

    may you all please get me some suggessions for the following?

    i have installed one PHE for chilled water generation and it was running fantastic for last 8 months .

    but for last few days it is not giving proper and of course rated parameters.

    the details of the PHE are as follows.

    alfa laval PHE ( semiwelded NH3 to water application)
    125 TR at the rate of 50 CMH and
    water in = +8 Deg C
    water out = + 2 Deg C
    EPR of danfoss is installed to control the evaporation temp. at -1 Deg C
    no oil is stuck in the phe or the surge drum.
    compressor is giving a capacity of 133 TR at - 1 to +40 Deg C

    the problem i am facing is
    even the EPR is there ,the evaporation temp. is falling down to
    -10 Deg C which i fear will cause the water to frost in side of the plates and will crack the plates.

    i have carried the following activities.
    1.cleaned the filter of the EPR
    2.replaced the CVP
    3.drained out the oil; but didnt get any oil trace in side of the system

    i am expecting smoe kind of suggessssions from you experts.

    have a nice time ever.

    waiting eagerly,

    priti



  2. #2
    Join Date
    Jun 2001
    Location
    N.Ireland
    Age
    50
    Posts
    1,632
    Rep Power
    24
    Hi, Priti,
    Just I few quick sugestions.

    1/Refrigerant charge
    2/Expansion valve/level control problem
    3/Reduced water flow due to dirt blocking a pump strainer
    4/Damaged pumped.

    I would try to establish pump flow rates on the Glycol/Brine side. If you have a flow meter on your system this is very simple, otherwise you are depending on commisioning data, such as temps in and out of the chiller and pump Amperes.
    Regards. Andy.

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