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Thread: suction preesure
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09-09-2005, 07:02 PM #1
suction preesure
how do you work out the suction pressure and head pressure for a system. I am looking for air off of about 10c for a cellar cooling application
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09-09-2005, 07:24 PM #2
Re: suction preesure
forgive me, for i am not a technical man.
if you want air off at 10c, why not use an a/c system? insted of cellar cooling.
cheers
eggs
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09-09-2005, 11:18 PM #3
Re: suction preesure
Considering most celler rooms wants to be at 10 - 12deg C why would you only want air off at 10 deg C?
IF AT FIRST YOU DON`T SUCCEED.
DESTROY ALL EVIDENCE THAT YOU TRIED!
and go get a cuppa
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09-09-2005, 11:30 PM #4
Re: suction pressure
Originally Posted by Ianh
The question is ambiguous, what are you trying to achieve ?Brian - Newton Abbot, Devon, UK
Retired March 2015
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11-09-2005, 08:44 PM #5
Re: suction preesure
Anyone remember 12? Cellar cooling was always 20-24 psi back pressure and about 95 psi head, get yourself a comparator and you can work out for yourself the temperature relationship. Transpose this to any of the 'new' refrigerants and ther's your problem solved !! O.K
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11-09-2005, 11:10 PM #6
Re: suction preesure
Hi Ianh and Paddy , good evening , good morning . good day , how are you ??????
Last edited by botrous; 11-09-2005 at 11:12 PM.
Engineering, sciences, math, physics and my brain will generate "not responding " soon
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01-11-2005, 12:00 PM #7
Re: suction preesure
For 10°C air out of the evaporator you must have an evaporating temperature of 5°C or below (but not 0°C because of frost build up). The best choice is te=2°C like it is in any water chillers. The evaporator must be sized with this evaporating temperature.
Then when te=2°C and the refrigerant say is R22 then with temperature-Pressure chart you can find the corresponding pressure (Pe). If the condenser is air cooled then measure the ambient air and add approx.12°C to it which will be your condensing temp.( if the condenser is sized correctly).
From the temperature-pressure chart find the pressure(Pc).
Suction and discharge pressures depend on the refrigerant used and also to the operating conditions (te,tc).Even Einstein Asked Questions
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