What is the normal compressor inlet pressure?

The normal compressor inlet pressure generally refers to the pressure at which the refrigerant enters the compressor for effective operation. In industrial refrigeration systems, the inlet pressure is commonly measured in pounds per square inch gauge (PSIG).

Choosing a pressure of 154 PSIG indicates a typical working pressure for many industrial applications, as it is suitable for ensuring the refrigerant can efficiently absorb heat from the evaporator and then be compressed. This aligns with the operational parameters necessary for adequate refrigeration performance in many systems.

The other options presented are temperatures rather than pressures, which would not provide relevant context to the concept of compressor inlet pressure. Temperature readings like 30°F, 40°F, and 34°F refer to specific points in the refrigeration cycle but do not represent the necessary pressure input for a compressor to function effectively. Understanding the distinction between pressure and temperature in this context is crucial for someone studying industrial refrigeration operations.