What function does an accumulator serve in a refrigeration cycle?

An accumulator plays a crucial role in a refrigeration cycle, particularly in systems utilizing a low-pressure evaporator. Its primary function is to temporarily store excess liquid refrigerant, ensuring that only vapor reaches the compressor. This is vital for maintaining the efficiency and safety of the system. If liquid refrigerant were to enter the compressor, it could cause damage, known as liquid slugging, which could lead to compressor failure. By preventing liquid refrigerant from entering the compressor, the accumulator protects the compressor from potential harm and allows for optimal performance of the refrigeration cycle.

The other answer choices refer to functions that do not accurately describe the role of an accumulator within the refrigeration system. For example, while it might seem logical to think that the accumulator could cool the refrigerant (as suggested in one option), cooling is typically more associated with the evaporator. Pumping refrigerant, as indicated in another option, is a function of the compressor rather than the accumulator. Similarly, measuring pressure is a role reserved for pressure gauges, not the accumulator. Thus, the correct understanding of the accumulator's function is essential for effectively managing and maintaining refrigeration systems.