Ideal gas pressures

[colsy]

HI,

Can somebody please let me know the ideal refrigerant pressures High and Low for R407c, R410a, R22, R134a......

Thanks

[Brian_UK]

Depends what they are being used for.

[colsy]

non inverter AC systems and fridges

[monkey spanners]

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.

[multisync]

ONE......HUNDRED......AND.........EIGHTY!!!!!!!!!!!!!!!

opps sorry wrong forum..my bad:off topic:

[D.D.KORANNE]

Varies with design conditions . However a compression ratio below 10 should be safe or ideal pressure.

[colsy]

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.

[Brian_UK]

As Monkey said above, use your PT tables to find the expected working pressures/temperatures.

[Sridhar1312]

For reading the pressure temperature chart you need the suction pressure and discharge pressure.
And the pressure depends on ambient prevailing also.

[lowcool]

good onya multi your right,one woulds think that everything is related at different pressures to achieve evaporating temperature,
triple top for me
cheers

[bill1983]

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.

[colsy]

Thanks for that bill, thats exactly whay I was asking to know.