Quote:
Originally Posted by BradC
A refrigerant as listed by ASHRAE has a defined number. R290 is pure propane. Full stop. End of story.
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I do agree when it comes to R290 it is refrigerant and it is pure dry propane. But people as DIY want to use BBQ "propane" which is mix of something...
Quote:
Originally Posted by BradC
R22a is not an ASHRAE sanctioned mnemonic by any stretch and what you get in the bottle is anybody's guess. Same with Envirosafe and all the rest of the substitute blends.
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R22a PT chart looks like R290 . We can guess it is just propane.
Quote:
Originally Posted by BradC
As for charging as a vapor, you only stand to add non-condensibles if you have them in your bottle in the first place.
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When you charge system with BBQ propane you get what you have there propane, butane, some other gasses I guess including non-condensibles like air.
Charging as liquid is industry standard, especially with blends.
Quote:
Originally Posted by BradC
R290 PT curve approximates R22, but the pressures are quite a bit lower.
This PT has R22 in Blue and R290 in Orange. Pressure in PSI, Temp in C
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Sorry I wanted to say R22a PT chart looks very close to R290 PT chart. I can assume that R22a is pure propane (hope refrigerant grade and dry)
We can use R290 chart when it comes to R22a because R290 chart is more complete.