What is the superheat leaving the compressor with a discharge pressure of 165 PSIG and a discharge temperature of 156ºF?

To determine the superheat leaving the compressor, it is necessary to understand the relationship between the discharge pressure and the corresponding saturation temperature of the refrigerant at that pressure. Superheat is defined as the temperature of the refrigerant vapor above its saturation temperature at a given pressure.

In this case, we have a discharge pressure of 165 PSIG. To find the saturation temperature at this pressure, we can reference refrigerant temperature-pressure tables or use a refrigerant property calculator. For many common refrigerants, the saturation temperature at 165 PSIG is typically around 90ºF (consult specific refrigerant data tables for the exact value).

The discharge temperature of the refrigerant is 156ºF. To find the superheat, we use the formula:

Superheat = Discharge Temperature - Saturation Temperature

Using the values:

Superheat = 156ºF - 90ºF = 66ºF

This calculation shows that the correct amount of superheat leaving the compressor is 66ºF, confirming that this answer is accurate based on how superheat is defined and calculated in refrigeration systems.