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Thread: operation pressure
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12-07-2010, 04:04 PM #1
operation pressure
Dear alls,
I would like to know how to determine the operation pressure (Low/High pressure) of a refrigeration cycle using R22 or R134a.
At my company, we control LP/HP of air-conditioner using R22 at: 4~4.2/18~20kgf/cm2. in near future, we will change R22 to R134s, so how to control the LP/HP of refrigeration cycle? Pls help me!
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12-07-2010, 11:04 PM #2
Re: operation pressure
Hi, do not think in pressures but in temperatures.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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13-07-2010, 07:11 AM #3
Re: operation pressure
Just check the R134a Pressure- Temperature charts and findout the LP/HP of R134a Corresponding to the R22 operating pressures/ Temperatures.
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13-07-2010, 07:37 AM #4
Re: operation pressure
What do you control on the AC's with the pressures you mention?
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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13-07-2010, 01:01 PM #5
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13-07-2010, 01:46 PM #6
Re: operation pressure
You running at -6,5 to -5 degree C evaporation and 46,5 to 51 degree C condensation. Your pressure with R134a should read 2,3~2,4/12,1~13,5 bar.
This is your smallest problem probably, the largest is that you loose a lot of cooling power when change to a crappy refrigerant. I assume you keep your machinery.
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13-07-2010, 03:16 PM #7
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13-07-2010, 03:31 PM #8
Re: operation pressure
Temperature will be same if your compressor is big enough.
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14-07-2010, 06:09 PM #9
Re: operation pressure
why the change from R22 to R134a ?
if it is because of the fase-out, you will be better to confert to R407C, you will loose about 3% performence.
Ice
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16-07-2010, 01:59 PM #10
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16-07-2010, 05:36 PM #11
Re: operation pressure
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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16-07-2010, 08:02 PM #12
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