In air-conditioning systems, which of the following components is primarily responsible for refrigerant flow control?

The component primarily responsible for refrigerant flow control in air-conditioning systems is the expansion valve. The expansion valve regulates the flow of refrigerant into the evaporator, allowing for a precise control of the refrigerant's pressure and temperature. As refrigerant passes through the expansion valve, it undergoes a pressure drop, which cools it before it enters the evaporator coil. This process is crucial because it ensures that the refrigerant is in the optimal state to absorb heat from the indoor air, facilitating efficient cooling.

The expansion valve plays a vital role in maintaining the desired temperatures within the system and managing the refrigerant cycle effectively. By controlling the amount of refrigerant that enters the evaporator, it helps to optimize the heat exchange process, enhancing the overall efficiency of the air-conditioning system.