What is the purpose of an expansion valve in the refrigeration cycle?

The function of the expansion valve in the refrigeration cycle is vital for the proper operation of the system. It regulates the flow of refrigerant into the evaporator while simultaneously reducing the pressure of the refrigerant. This process is essential because, as the refrigerant enters the evaporator, it must be at a low pressure to properly absorb heat from the surrounding environment.

By lowering the pressure, the expansion valve allows the refrigerant to evaporate at a lower temperature, which enhances the heat absorption capability when it circulates through the evaporator. As the refrigerant passes through the expansion valve, it transforms from a high-pressure liquid to a low-pressure liquid/gas mixture, ensuring that the refrigerant is in the correct state to efficiently absorb heat and perform its cooling function.

This precise control is crucial for maintaining system balance and efficiency, which contributes significantly to the overall effectiveness of the refrigeration cycle.