What is the saturation temperature of a refrigerant at a suction pressure of 32 PSIG?

To determine the saturation temperature of a refrigerant at a given suction pressure, you typically refer to a pressure-temperature chart specific to that refrigerant. In this case, a suction pressure of 32 PSIG means that we first need to express this pressure in absolute terms. PSIG is gauge pressure, so we add atmospheric pressure, which is generally around 14.7 PSI, resulting in an absolute pressure of approximately 46.7 PSIA (32 PSIG + 14.7 PSI).

When looking up this absolute pressure in a refrigerant saturation table, you can find the corresponding saturation temperature. For many common refrigerants, a suction pressure of 32 PSIG (or 46.7 PSIA) typically aligns with a saturation temperature around 19°F. This relationship indicates the temperature at which the refrigerant will boil under that pressure, which is critical for understanding how refrigeration cycles operate.

The other temperature choices provided do not correspond to the saturation temperature for that pressure, as they would be either too high or not aligned with the physical properties observed in standard refrigerant tables. Thus, the selection of 19°F as the saturation temperature at a suction pressure of 32 PSIG demonstrates a proper understanding of refrigerant properties and vapor-liquid