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Thread: Ideal gas pressures
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15-11-2009, 02:34 PM #1
Ideal gas pressures
HI,
Can somebody please let me know the ideal refrigerant pressures High and Low for R407c, R410a, R22, R134a......
Thanks
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15-11-2009, 04:59 PM #2
Re: Ideal gas pressures
Depends what they are being used for.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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15-11-2009, 08:53 PM #3
Re: Ideal gas pressures
non inverter AC systems and fridges
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15-11-2009, 09:18 PM #4
Re: Ideal gas pressures
If you look at your gauges or better still get one of those slide rule thingies there will be a chart of pressures and temperatures. Change the temperature and the pressure will change also. Have a look at this and get a feel for how different evaporating or condensing temperatures will alter the presssures.
So a room ac system cooling a room at 30C will have a different suction pressure to one running in a room at 18C.
Your question is impossible to answer accurately without specific system operating conditions.
I may well be wrong in guessing your motives for asking but there is no chart of correct pressure to see if a system is working ok. Its not that simple.
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16-11-2009, 08:00 AM #5
Re: Ideal gas pressures
ONE......HUNDRED......AND.........EIGHTY!!!!!!!!!!!!!!!
opps sorry wrong forum..my bad
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16-11-2009, 09:20 AM #6
Re: Ideal gas pressures
Varies with design conditions . However a compression ratio below 10 should be safe or ideal pressure.
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16-11-2009, 01:12 PM #7
Re: Ideal gas pressures
Ok Thanks, I wasnt meaning an exact pressure and also I was meaning a fridge operating at 2 or 3 degrees, and an AC system controlling at 21 degrees for example.
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16-11-2009, 06:53 PM #8
Re: Ideal gas pressures
As Monkey said above, use your PT tables to find the expected working pressures/temperatures.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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17-11-2009, 04:56 AM #9
Re: Ideal gas pressures
For reading the pressure temperature chart you need the suction pressure and discharge pressure.
And the pressure depends on ambient prevailing also.
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17-11-2009, 11:03 AM #10
Re: Ideal gas pressures
good onya multi your right,one woulds think that everything is related at different pressures to achieve evaporating temperature,
triple top for me
cheersmmm to beer or not to beer...........lets drink breakfast
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17-11-2009, 09:35 PM #11
Re: Gas pressures
hi colsy welcome to fridges. for the reqired temp, use an evaporating temp/pressure about 10c lower than the temperature required. its a useful rule of thumb. regardless of the refrigerant used, the evaporating temperature will mostly follow that rule, so find the refrigerant you're interested in on a comparator, find the temperature you want the product to be stored at, reduce this by 10c and convert to pressure.
et voila as they say in france; there you have it.
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23-11-2009, 12:48 PM #12
Re: Gas pressures
Thanks for that bill, thats exactly whay I was asking to know.
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