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03-07-2008, 03:10 AM #1
heat exchanger between subcooling and superheat line
Does anyone use heat exchanger between subcooling line and superheat line? It works or not? I remember there is a discussion post about this in forum. But I couldnt find it now. Thanks.
David
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03-07-2008, 05:17 AM #2
Re: heat exchanger between subcooling and superheat line
Here is a link to one thread.
http://www.refrigeration-engineer.co...ad.php?t=11946
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03-07-2008, 03:20 PM #3
Re: heat exchanger between subcooling and superheat line
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03-07-2008, 03:47 PM #4
Re: heat exchanger between subcooling and superheat line
It works, but as most people due, irresponsibly increase superheat to increase subcooling as much as they can. This is the best way to have a high efficiency, quickly dying, compressor. It will suck rarefied, superheated vapour at high temperature, and the motor will soon burn.
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03-07-2008, 04:51 PM #5
Re: heat exchanger between subcooling and superheat line
I think this is way oversimplified. I agree it is not the best idea to install a SG/LL HE on a system running at -40C evaporating and 50C condensing. However there is many systems running at operating conditions where a SG/LL HE can be aplied with great success. If very high condensing is experienced only a short time every year, then a SG/LL HE can be combined with a demand cooling system for lowering the suction gas temperature those days ambient is very high.
The efficiency of the compressor is also an important factor under these circumstances. An ineficcient compressor leads to even higher discharge temperatures than a more efficient compressor does.
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03-07-2008, 05:12 PM #6
Re: heat exchanger between subcooling and superheat line
Agreed, but these days I've seen too many pirates, who simply downsize the compressor and gets the extraquid with a SG/LL HE, causing 25K subcooling and 40K superheating, with a discharge temperature in excess of 130-140°C.
For example icecream makers of an important italian brand.
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03-07-2008, 07:32 PM #7
Re: heat exchanger between subcooling and superheat line
Originally Posted by NoNickName
The lowest common denominator everyone sees is cost, because they don't understand the long term effects and usually don't want to listen to someone.
If all else fails, ask for help.
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03-07-2008, 08:20 PM #8
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04-07-2008, 03:27 AM #9
Re: heat exchanger between subcooling and superheat line
Thank you everyone. Great discussion. Let me digest them before I can make new comments. Thanks.
Happy holiday!
David
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04-07-2008, 08:42 AM #10
Re: heat exchanger between subcooling and superheat line
Holiday you said??? What's a holiday??
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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04-07-2008, 06:37 PM #11
Re: heat exchanger between subcooling and superheat line
Peter, I think this long weekend is holiday. July 4.
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