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Thread: chilled water PHE
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31-07-2002, 07:59 AM #1
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
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31-07-2002, 08:25 PM #2
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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