how would you tell the saturation temperature of a refrigerant gas?

Question

in an evaporator at the expansion valve bulb the temperature is 10 degrees at say 30psi ( 2 bar ) is there a certain saturation temperature corresponding to the pressure of the refrigerant and can this be read of my gauges.. eg 2bar would be -10 with 134a

Answer 1

Not sure I understand what you are asking.
You can choose to specify either temperature or pressue at the saturation point, but not both.

If the refrigerant is boiling, that's a 2-phase solution. The mixture will range from all liquid to all gas without a change in pressure or temperature. It will be saturated vapor by definition.

For common refrigerants it is probably simpler to look up the information - it should be published or at least available from the manufacturer.

Answer 2

my table says that R-134a at 2 bars saturated is -10.18 degrees C. This is about 17.7 degrees F