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Thread: high discharge temperature
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03-08-2013, 08:09 PM #1
high discharge temperature
Hello
Among some causes of too high discharge temperature in many articles there is mentioned low suction pressure. Among some causes of the LSP are named : low evaporator heat loads; frosted evaporator coils; evaporator fan out. How can the latter ones lead to increase of the discharge temperature ?
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03-08-2013, 10:31 PM #2
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04-08-2013, 07:28 AM #3
Re: high discharge temperature
Hi, Yuri B
See this... link within passandscore answer .. a good article
http://www.refrigeration-engineer.co...rge-temprature
Best regards, Josip
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
No job is as important as to jeopardize the safety of you or those that you work with.
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04-08-2013, 09:24 AM #4
Re: high discharge temperature
Thank you for your answers !
But, the suction SH cannot be high, the returning gas is cool, with a capillary expansion device the gas is dense, the motor does less work and is less loaded, why the DT should increase ? The article does not explain this .
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04-08-2013, 10:08 AM #5
Re: high discharge temperature
I think it suggests compression ratio & volumetric efficiency. YOu say cool gas returning, but what is superheat & pressures at that time. Every situation is different so these are basic reasons. If you have a real life scenario we could be able to anylize things better. Leaking valves is another option.
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04-08-2013, 10:26 AM #6
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04-08-2013, 02:22 PM #7
Re: high discharge temperature
Cpillar tube based systems shoud have the exact amount of refrigerant.
Air in the system, partialy blocked drier, over charged system will raise the discharge pressure\temperature.
you should recover the gas, replace drier, weigh the righe amount of refrigerant in.
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04-08-2013, 06:16 PM #8
Re: high discharge temperature
I should say I did not mean a particular case to resolve.
Last edited by Yuri B.; 04-08-2013 at 06:19 PM.
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05-08-2013, 12:44 PM #9
Re: high discharge temperature
Hi, Yuri B.
In attached document, please, try to find your case ....
Troubleshooting Mollier chart.pdf
Best regards, Josip
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
No job is as important as to jeopardize the safety of you or those that you work with.
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09-08-2013, 07:36 AM #10
Re: high discharge temperature
If the discharge temperature elevates without rise the inlet superheat, this would indicate the problem of compressor mechanical trouble.
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09-08-2013, 06:57 PM #11
Re: high discharge temperature
Yes, and the efficiency - already mentioned here - drops in this case. However, worn out valves and what else is something different than "low load".
Last edited by Yuri B.; 09-08-2013 at 07:00 PM.