Which component controls the flow rate based on the superheat at the evaporator outlet?

The Thermostatic Expansion Valve (TXV) is designed to regulate the flow of refrigerant into the evaporator based on superheat readings at the evaporator outlet. It plays a crucial role in ensuring that sufficient refrigerant enters the evaporator to absorb heat while preventing liquid refrigerant from returning to the compressor, which could cause damage.

As the evaporator absorbs heat, the refrigerant vaporizes, and the TXV continually monitors the temperature and pressure of the refrigerant exiting the evaporator. By doing so, it maintains the desired superheat, which is essential for efficient system operation and to ensure the compressor operates within its safe parameters. If the superheat is too low, the TXV will increase refrigerant flow to the evaporator, and if it is too high, it will reduce the flow, effectively managing the system’s performance.

In contrast, the other components have different functions; for instance, the suction line accumulator stores excess refrigerant to prevent liquid refrigerant from reaching the compressor but does not control flow based on superheat. The receiver drier primarily functions to remove moisture and contaminants from the refrigerant, and the compressor is responsible for moving the refrigerant through the system but does not regulate flow based on superheat. Understanding