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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
frank721
Thanks for your suggestion. there is no other device between the accumulator and compressor. But you bring a good point: kink in the line. In fact, the diameter of outlet of accumulator is 7/8" and diameter of inlet of compressor is 5/8", but they are connected with a smaller tube of 1/4"
is it the reason that cause the big pressure drop?
Are you serious? A 1/4" connecting line? :eek:
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
desA
Are you serious? A 1/4" connecting line? :eek:
I read that several times and it just didn't register that anyone would actually do that... lol
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
frank721
In fact, the diameter of outlet of accumulator is 7/8" and diameter of inlet of compressor is 5/8", but they are connected with a smaller tube of 1/4"
is it the reason that cause the big pressure drop?
Yes... that would definitely do it.
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
Yuri B.
Hi Frank.
What temp air off evap ?
hi, my evaporator is used for liquid cooling like cooling system in the desktop now. so, there is no air off evap
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
Gary
Are there any devices between the evaporator and the accumulator?
Quote:
Originally Posted by
Gary
After reading your other thread, I am even more confused. This is either an A/C system or it is a cooler system that you are trying to convert to an A/C system. Which is it?
Quote:
Originally Posted by
desA
Are you serious? A 1/4" connecting line? :eek:
Quote:
Originally Posted by
Gary
I read that several times and it just didn't register that anyone would actually do that... lol
yes, it is 1/4" really.
there is a needle valve between the evap and accumulator. but it is fully open. pressure drop is not significant when fully open.
it seems that we have found the cause of the 2 bar pressure drop:7/8" to 1/4"
thanks a lot, my friends:)
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1 Attachment(s)
Re: Pressure drop through the suction line accumulator?
For discussing conveniently, i post the schematic of the evaporator. i measured the pressures at Point 1 and 2.
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Re: Pressure drop through the suction line accumulator?
frank if suction line diameter is fixed by size of accumulator port,what the hell happened.when anyone has a vague out i call it the autoduhh syndrome it can happen any time.
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Re: Pressure drop through the suction line accumulator?
interesting picture whats it of frank
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Re: Pressure drop through the suction line accumulator?
I think your compressor is going to suffer the world of pain, sooner, rather than later... :(
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Re: Pressure drop through the suction line accumulator?
That's a flooded evaporator... and a whole different ball game.
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Re: Pressure drop through the suction line accumulator?
Interesting drawing, looks like a oil recovery bottle on a flooded ammonia evaporator.
If not ammonia, could be anyones guess.
I can see why you have a 2 bar delta P from evap to compressor, with 3/8 dry suction.
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Re: Pressure drop through the suction line accumulator?
OK, I went back and read the original ost again, its R134A. Could still be a scavenge oil recovery line that rises up in vessel to control level, the 1/4 "line would restrict flow and limit it. Also the 3/8 dry suction may be intentional to restrict carry over.
What controls liquid feed to flooded evaporator ?
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
lowcool
frank if suction line diameter is fixed by size of accumulator port,what the hell happened.when anyone has a vague out i call it the autoduhh syndrome it can happen any time.
the inlet of accumulator is fixed, but you can use adaptor to reduce the diamter:confused:
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
desA
I think your compressor is going to suffer the world of pain, sooner, rather than later... :(
why do you think so? sooner not later?:eek:
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
Gary
That's a flooded evaporator... and a whole different ball game.
as i said before, this system is taken over from other people. so i want to figure out the problem.
do u have any suggestion on this so-called flooded evaporator?
thanks a lot:)
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
Magoo
OK, I went back and read the original ost again, its R134A. Could still be a scavenge oil recovery line that rises up in vessel to control level, the 1/4 "line would restrict flow and limit it. Also the 3/8 dry suction may be intentional to restrict carry over.
What controls liquid feed to flooded evaporator ?
what do u mean by "scavenge oil recovery line that rises up in vessel to control level"?
can u elaborate it?
before the evaporator, there is a manual valve to control the feeding liquid.
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
frank721
why do you think so? sooner not later?:eek:
My concern is about liquid slugs getting into the compressor, if the system is not controlled carefully.
If that's all taken care of & guaranteed as a non-event, then rest easy - if not, then you may want to research further.
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Re: Pressure drop through the suction line accumulator?
dunno here we go years ago came across this sort of cascade system and i reckon that something like this was used on the expansion recovery,over run what ever circuit,come suction accumulator what ever to keep the feed up to the refrigerant pump.must say it was a little bit bigger on sizing but.ammonia blokes should have an idea
anybody else good for ideas
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Re: Pressure drop through the suction line accumulator?
The 1/4 inch pipe you mentioned is usually a support pipe . I have in one instance noticed that one of the pipe tilts if you test the accumulator indepedently . So to my knowledge it is a support pipe . Just check with manufacturer . Besides, give me the following data to select the right model for you to compare.
Refrigerant
evap capacity
condensing temp
evaporation temp .
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
desA
My concern is about liquid slugs getting into the compressor, if the system is not controlled carefully.
If that's all taken care of & guaranteed as a non-event, then rest easy - if not, then you may want to research further.
ok, then what do u think shoud be taken care?
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
lowcool
dunno here we go years ago came across this sort of cascade system and i reckon that something like this was used on the expansion recovery,over run what ever circuit,come suction accumulator what ever to keep the feed up to the refrigerant pump.must say it was a little bit bigger on sizing but.ammonia blokes should have an idea
anybody else good for ideas
thanks, any experience on R134a?
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Re: Pressure drop through the suction line accumulator?
Quote:
Originally Posted by
D.D.KORANNE
The 1/4 inch pipe you mentioned is usually a support pipe . I have in one instance noticed that one of the pipe tilts if you test the accumulator indepedently . So to my knowledge it is a support pipe . Just check with manufacturer . Besides, give me the following data to select the right model for you to compare.
Refrigerant
evap capacity
condensing temp
evaporation temp .
Refrigerant : R134a
evap capacity:1~1.5kW
condensing temp:40~50 degree C
evaporation temp:15 degree C
Thanks a lot! by the way how to transfer cooling capacity in unit of "tons of R22" to "kW of R134a"?