View Full Version : operation pressure
thanhck
12-07-2010, 04:04 PM
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!
Brian_UK
12-07-2010, 11:04 PM
Hi, do not think in pressures but in temperatures.
sendhilkmar
13-07-2010, 07:11 AM
Just check the R134a Pressure- Temperature charts and findout the LP/HP of R134a Corresponding to the R22 operating pressures/ Temperatures.
Peter_1
13-07-2010, 07:37 AM
What do you control on the AC's with the pressures you mention?
thanhck
13-07-2010, 01:01 PM
Hi, do not think in pressures but in temperatures.
can you explain clearly?
I'm a beginer so i have lot of difficult with refrigerant cycle:(
toprunner
13-07-2010, 01:46 PM
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.
thanhck
13-07-2010, 03:16 PM
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.
Thanks, I'm more clearly. but temperature running of evaporator of chiller and Air conditioner are different or not?
toprunner
13-07-2010, 03:31 PM
Temperature will be same if your compressor is big enough.
icecube51
14-07-2010, 06:09 PM
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
thanhck
16-07-2010, 01:59 PM
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
My company change from chiller Mc. Quay (R-22) to chiller Trane (R134a)!!!!!
Peter_1
16-07-2010, 05:36 PM
.....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.
Crappy refrigerant? Wait a year or two and you will have to change your point of view completely. R134a will become THE refrigerant for cooling and chiller applications due to its low GWP. R404a and R507c will be banned or highly taxed in the near future
icecube51
16-07-2010, 08:02 PM
Crappy refrigerant? Wait a year or two and you will have to change your point of view completely. R134a will become THE refrigerant for cooling and chiller applications due to its low GWP. R404a and R507c will be banned or highly taxed in the near future
Hear Hear, spoken in truth.
when you start to now the wonders of R134a, you never want anything else.
Ice
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