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Thread: Oil Accumulation
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20-03-2008, 12:00 PM #1
Oil Accumulation
hi everyone!
i'm very new in refrigeration and sometimes some big problems. this one is one of them well, i hope i could get my solution here.
during the refrigeration cycle, some oil of the compressor flows with the refrigerant.while it is flowing into evaporator from capillary tube, oil accumulation happens in the entry of the evaporator. i wonder how can i prevent the evaporator from oil accumulation.
i'm sorry for terminology
thanks.
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20-03-2008, 01:23 PM #2
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20-03-2008, 01:34 PM #3
Re: Oil Accumulation
question:
Is the compressor and evaporator on the same level?
Problems normally occur on poorly designed systems or if the evap is below the compressor.
Refrigeration engineers solve this through careful design, the rest of us use oil separators!
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20-03-2008, 02:03 PM #4
Re: Oil Accumulation
Until you give us more information as nike has suggested, Let's assume this is a freezer.
Take a look at the defrost operation of this unit to verify all is working well. I always like to see a minimum of 4 defrost cycles in a 24 hour period.
Proper defrost cycles are very important in low temperature applications. Excess frost restricts the airflow and reduces coil loading. This can cause oil to be trapped in the evap possibly causing floodback to the compressor.
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20-03-2008, 02:07 PM #5
Re: Oil Accumulation
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20-03-2008, 02:08 PM #6
Re: Oil Accumulation
thanks for your replies.
well this problem occurs in refrigerators. there is a capillary tube with heat exchanger. capillary and evaporator tubes are jointed by welding. since capillary diameter size is too smaller than the evap tube diameter, the oil accumulates while flowing into the evaporator tube.
by the way compressor is below the evaporator, not on the same level.
how should i design the system? and what is the oil separator?
thanks again and again.
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20-03-2008, 02:11 PM #7
Re: Oil Accumulation
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20-03-2008, 02:20 PM #8
Re: Oil Accumulation
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20-03-2008, 02:29 PM #9
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20-03-2008, 02:45 PM #10
Re: Oil Accumulation
img91.imageshack.us/my.php?image=oilxd8.jpg
well this is what i try to tell
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20-03-2008, 02:45 PM #11
Re: Oil Accumulation
Even the best compressor fitted with separators sometime seize up, I seem them and read about them all the time.
Ohh shi..
Seriously, it was a light hearted response because not much information was given
Forgive me, I shouldn't have. This is serious business, but it's 11.45pm here and not much to do
Sorry ozankalkan, at least I got you to tell us whether the compressor and evap where on the same level or not and find out whether you know what an oil separator is.
edit: this is his image from the above post. Saves people copy and pasting as I can hot link so I hope it makes it up to you.Last edited by paul_h; 20-03-2008 at 03:02 PM.
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20-03-2008, 02:58 PM #12
Re: Oil Accumulation
Last edited by Gary; 20-03-2008 at 03:01 PM.
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20-03-2008, 03:05 PM #13
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20-03-2008, 03:12 PM #14
Re: Oil Accumulation
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20-03-2008, 03:19 PM #15
Re: Oil Accumulation
Would it be possible for a few drops of oil to accumulate as shown in the drawing? Yes. Would this affect the operation? No. It would not be enough to make any difference at all. It is not important.
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20-03-2008, 03:46 PM #16
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20-03-2008, 04:23 PM #17
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Re: Oil Accumulation
Do you maybe know what velocity of refrigerant you have in evaporator and what kind of refrigerant you using? Could you explain evaporator design?
Where is refrigerant injection, at top of evaporator or at bottom?
Do you have parallel circuits or serial circuits in evaporator?
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20-03-2008, 08:41 PM #18
Re: Oil Accumulation
What problem is the oil accumilation at the entry to the evaporator causing? What are the symptoms?
Is the capiliary blocking up?
Cheers Jon
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