Calculate the superheat at the outlet of the compressor with a discharge temperature of 175°F and discharge pressure of 152 PSIG.

To calculate the superheat at the outlet of the compressor, it is important to understand the relationship between the discharge temperature and the saturation temperature corresponding to the discharge pressure. Superheat is defined as the difference between the actual discharge temperature and the saturation temperature of the refrigerant at the given pressure.

In this case, the discharge pressure is 152 PSIG. To find the saturation temperature, you first need to convert the pressure to absolute pressure by adding atmospheric pressure (approximately 14.7 PSIA for standard conditions), resulting in a total of approximately 166.7 PSIA. Next, you can use a refrigerant pressure-temperature chart or a refrigerant property calculator to find the saturation temperature at 166.7 PSIA.

Assuming that the saturation temperature corresponding to this pressure is approximately 85°F, the superheat would be calculated by taking the actual discharge temperature (175°F) and subtracting the saturation temperature (85°F):

Superheat = Discharge Temperature - Saturation Temperature

Superheat = 175°F - 85°F = 90°F.

Therefore, the calculated superheat of 90°F indicates how much the refrigerant vapor is heated above its saturation temperature at the compressor’s discharge pressure, allowing for better efficiency and preventing