Originally Posted by
Rob White
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R125 has a boiling point at 0 barg of about -50degc
R134 has a boiling point at 0 barg of about -26degc
I struggled to find a chart for 421A but found an obscure
reference to it boiling at about -38degc ( which is 50 + 26 / 2) ish.
I would imagine that if the heat exchanger had a very small temperature
differences over it, it would boil at a constant temperature but if the Delta T
over the evaporator is high then the glide would be more noticeable.
So in answer to your question I would say "no" but the heat exchange would have to be aggressive.
Regards
Rob
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