Which device regulates how much liquid refrigerant enters the evaporator to achieve the desired cooling?

Which device regulates how much liquid refrigerant enters the evaporator to achieve the desired cooling?

• A. Metering devices
• B. Condenser
• C. Compressor
• D. Diffusers

Answer: (A)

Metering devices regulate how much liquid refrigerant enters the evaporator, which determines the cooling effect. They throttle the high-pressure liquid as it moves from the condenser into the evaporator, causing a pressure and temperature drop that allows liquid to expand and partly flash into vapor inside the evaporator. This control keeps the evaporator from being flooded with liquid or starved of refrigerant, helping maintain the proper superheat and steady cooling capacity. The condenser’s job is to reject heat and condense refrigerant from vapor to liquid; the compressor circulates refrigerant and raises its pressure; diffusers aren’t used to control the amount of refrigerant entering the evaporator.

Metering devices regulate how much liquid refrigerant enters the evaporator, which determines the cooling effect. They throttle the high-pressure liquid as it moves from the condenser into the evaporator, causing a pressure and temperature drop that allows liquid to expand and partly flash into vapor inside the evaporator. This control keeps the evaporator from being flooded with liquid or starved of refrigerant, helping maintain the proper superheat and steady cooling capacity. The condenser’s job is to reject heat and condense refrigerant from vapor to liquid; the compressor circulates refrigerant and raises its pressure; diffusers aren’t used to control the amount of refrigerant entering the evaporator.