Which component is NOT found in a simple closed-cycle compression refrigeration system?

In a simple closed-cycle compression refrigeration system, the primary components include the compressor, condenser, expansion valve, and evaporator. Each of these plays a distinct role in the refrigeration cycle, which relies on the compression and expansion of refrigerants to transfer heat from one place to another.

The absorber is the component identified that is not present in this type of refrigeration system. Instead, the absorber is fundamental to absorption refrigeration systems, where it works in conjunction with a generator, condenser, and evaporator. In this context, the absorber extracts refrigerant vapor and dissolves it in an absorbent solution, which is a different methodology compared to the mechanical compression of vapor in a closed-cycle system.

In contrast, the liquid receiver, evaporator, and compressor are essential components in closed-cycle systems. The liquid receiver stores refrigerant in its liquid state from the condenser before it flows to the expansion device. The evaporator allows the refrigerant to absorb heat as it vaporizes, thereby cooling the area to be refrigerated. The compressor pumps the refrigerant through the system, maintaining the flow and facilitating the heat exchange process.

Understanding these components' roles clarifies why the absorber is absent in a simple closed-cycle compression refrigeration system, distinguishing it from the other components integral to