Which type of refrigeration system is classified as a closed cycle mechanical refrigeration system?

The classification of refrigeration systems can often be understood by examining how they operate. A closed cycle mechanical refrigeration system utilizes a refrigerant that circulates through the system, undergoing phase changes to absorb and reject heat effectively.

The compression system is considered a closed cycle mechanical refrigeration system because it relies on mechanical work—typically provided by a compressor—to compress refrigerant vapor. This compression raises the refrigerant's pressure and temperature, allowing it to release heat when condensing into a liquid. The cycle continues with the liquid refrigerant evaporating to absorb heat from the space being cooled, which then returns to the compressor as vapor. This cyclical process of compression, condensation, expansion, and evaporation encapsulates the definition of a closed loop system, where the refrigerant continuously circulates within the boundaries of the system.

In contrast, other systems presented in the options, such as absorption, chilled water, and direct expansion systems, may involve different mechanisms and setups that can include open components or multiple fluids, thus not being classified strictly as closed cycle mechanical systems. A comprehension of these distinctions makes it clear that the compression system fits the criteria for a closed cycle mechanical refrigeration system, demonstrating its effectiveness and reliability in refrigeration applications.