What does the metering device in a refrigeration system primarily control?

The metering device in a refrigeration system primarily controls the flow of refrigerant. It performs a critical function by regulating the amount of refrigerant that enters the evaporator coil. This regulation is essential because the correct flow ensures that the evaporator can absorb the appropriate amount of heat from the environment to maintain desired temperature levels.

Controlling the flow of refrigerant helps achieve the desired cooling effect efficiently while preventing issues such as flooding the evaporator, which can lead to reduced system efficiency and potential damage. By adjusting the flow based on system demand, the metering device ensures optimal performance and contributes to the overall efficiency of the refrigeration system.

While temperature, pressure, and humidity levels are important aspects of a refrigeration system, they are not directly controlled by the metering device. Instead, these factors are influenced by the proper functioning of the metering device in combination with other system components.