What term describes the device that meters the flow of refrigerant into the evaporator?

The term that describes the device responsible for metering the flow of refrigerant into the evaporator is the expansion valve. The primary function of the expansion valve is to control the amount of refrigerant that enters the evaporator based on the system's cooling demands. By doing this, it ensures that the refrigerant expands and cools adequately as it absorbs heat from the surrounding area within the evaporator.

The expansion valve lowers the pressure of the refrigerant, allowing it to transition from a liquid state to a gas state, which is essential for effective heat absorption. Proper metering of the refrigerant flow is crucial for maintaining efficient system operation, preventing both undercooling and overheating situations.

Other devices mentioned serve different roles within a refrigeration system. The compressor, for instance, is responsible for circulating the refrigerant and increasing its pressure after it leaves the evaporator. The receiver collects and stores surplus refrigerant to ensure that the system has enough refrigerant on hand, while the accumulator acts to store excess refrigerant vapor and prevent liquid refrigerant from reaching the compressor. Each component is vital, but the one specifically focusing on controlling refrigerant flow into the evaporator is indeed the expansion valve.