compressor discharge temps

[Welder]

Any advice on R22,R407c and R410A expected compressor discharge temps?

[Sandro Baptista]

Welder,
It all depends on the pressure ratio, discharge/suction pressure and superheat temperature...and also of the compressor type and brand.

it could be between 50ºC...120ºC but also it could be out of this range...like I said all depend of the operating conditions.

[Aik]

If I not mistaken, besides compressor type it also depends on type of oil...

[Sandro Baptista]

yes, also agree. However I think that have a 2nd order importance.

[Tesla]

Hi Welder
Not to sure about the other refrigerants but I was taught (when I was younger) for R22, 12 or 502 the rule of thumb was around 21°C above ambient for the condensing temp. I'm sure some members could give an example range for the others for general ambient conditions how ever extreme ambients could differ a little.

[Sandro Baptista]

Hi Welder
Not to sure about the other refrigerants but I was taught (when I was younger) for R22, 12 or 502 the rule of thumb was around 21°C above ambient for the condensing temp. I'm sure some members could give an example range for the others for general ambient conditions how ever extreme ambients could differ a little.

Tesla,

You really can a rule of thumb only because for the same condensing temperature if the suction pressure is equivalent at 0ºC it will be xxºC of discharge temperature; now if it is -30ºC it will be a bigger bigger discharge temperature.

[Sandro Baptista]

You really can call a rule of thumb only...

[Tesla]

Sandro Baptista I only wrote a general rule of thumb for gerneral conditions and it can be applied to varying evap temps. As these three gases have their temp ranges - low, med and high. With your age you should know this as a general rule of thumb. Welder is asking what the expected cond temps are and I have written what I would expect for one of the gases. Can we not give what might be expected for the other gases for general conditions even if there may be exceptions?

[Sandro Baptista]

Tesla, he asked about discharge temperature and it varies a lot with the operating conditions that's why we should indicate a range of temperatures. If he want more accurancy then he should gives precise parameters.

Even if he asked about expected condensing temperature that's depends on the weather conditions and condenser selection criteria. In conclusion that could vary a lot.

[Welder]

ok Suction 5 deg ambient 12 deg?

[Sandro Baptista]

12ºC ambient...what's the condensing temperature you want to use? it depends on the DT.

[Welder]

27? condensing

[Sandro Baptista]

-5ºC(saturated temperature)/+27ºC(saturated temperature) measure at inlet and outlet of the compressor.

Considered type of compressor: piston

R22 » +55ºC
R407C » +60ºC
R410A » +50ºC

Hope this helps
Note: Approximate temperatures. suction superheated temperature considered = 6K

[nike123]

Sandro Baptista I only wrote a general rule of thumb for gerneral conditions and it can be applied to varying evap temps. As these three gases have their temp ranges - low, med and high. With your age you should know this as a general rule of thumb. Welder is asking what the expected cond temps are and I have written what I would expect for one of the gases. Can we not give what might be expected for the other gases for general conditions even if there may be exceptions?

General rule of thumb would be 20-30K and not 21K exactly. ;)

[Brian_UK]

With those refrigerants listed I would assume that you are looking mainly at AC equipment.

If you are worried about the maximum temperatures then compare notes with the manufacturers fault finding instructions.

When you get to the page with F??, High Discharge Temperature, it will give you the tripping temperature.

[Welder]

Ok thanks gents.I have checked the unit suction is 0 discharge is 50 C ,ambient is 8.6 c.R22 Does that sound about right?

[Sandro Baptista]

It seems okay comparing with the preview discharge temperatures indicated and having in account that the pressure ration is a little less.