What role does a capillary tube play in a refrigeration system?

A capillary tube serves an essential function in a refrigeration system by regulating the flow of refrigerant. This device is a long, narrow tube that creates a pressure drop between the high-pressure side of the system (the condenser) and the low-pressure side (the evaporator). As the refrigerant passes through the capillary tube, the reduction in pressure allows for the efficient expansion and conversion of refrigerant from a liquid to a gas. This regulation ensures that the correct amount of refrigerant enters the evaporator, facilitating optimal heat absorption and maintaining efficient cooling performance.

By managing the refrigerant flow, the capillary tube plays a crucial role in the overall operation of the refrigeration system, helping maintain the desired temperature and efficiency levels. The design and function of capillary tubes make them suitable for small refrigeration systems, particularly those that do not require the complexity of more sophisticated expansion devices like thermostatic expansion valves.