Which of the following is not a principal component of a simple closed-cycle compression refrigeration system?

In a simple closed-cycle compression refrigeration system, the primary components included are the evaporator, liquid refrigerant control (often a metering device), and the condenser.

The evaporator plays a crucial role by allowing the refrigerant to absorb heat from the environment, which causes it to evaporate and transition into a gas. The liquid refrigerant control regulates the flow of refrigerant entering the evaporator, ensuring that the system operates efficiently by metering the correct amount of refrigerant based on the system's needs. The condenser, on the other hand, is essential for rejecting heat from the refrigerant, allowing it to condense back into a liquid state.

A regenerator, while a component sometimes utilized in more complex heat recovery systems, is not typically part of a simple closed-cycle refrigeration system. The absence of a regenerator simplifies the design and operation of the system, focusing on the basic refrigeration cycle without additional heat exchange processes. Therefore, recognizing that a regenerator is not necessary in this context helps clarify why it is not included as a principal component in a simple closed-cycle compression refrigeration system.