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Thread: oil cooling problem
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14-03-2010, 05:58 AM #1
oil cooling problem
Dear All,
I started one screw compressor that is designed in condition -10 C as evaporating temp. and +35 as condensing temp. also this compressor is designed with fixed Vi
The pressure of liquid seperator (suction press) was 7 bar(a) in start.
The compressor worked at partial load (about 10% capacity) about 5min. after that high discharge temp. alarm turned up.
I think inner pressure of compessor at oil input of compressor has extra pressure rather discharge press. so oil circulation not been did correctly.
Please advise if you have idea
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14-03-2010, 11:28 AM #2
Re: oil cooling problem
chichi ,
If compressor is differential oil feed it may cause this due to low oil flow, because little pressure difference between suction & discharge .
If lubricated and oil injection cooling by oil pump it should work fine .
Either load machine up or restrict suction valve on machine to achieve bigger pressure difference until plant settles down .
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15-03-2010, 07:41 AM #3
Re: oil cooling problem
thanks a lot for your kind advice
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15-03-2010, 07:42 AM #4
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15-03-2010, 09:00 AM #5
Re: oil cooling problem
Hi, chichi
sometimes at very low partial load you can have a high oil temp .... RANGER1 gave you a good suggestion ... the best is to increase capacity a little to achieve more refrigerant to flow through compressor in your case suction gas had a very high temperature and flow was reduced - right way to get high oil temp ....(take care not to come to high discharge pressure)
Best regards, Josip
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