What happens to a TXV when there is an increased load to the evaporator coil?

When there is an increased load to the evaporator coil, the thermal expansion valve (TXV) responds by allowing more refrigerant to enter the coil. This process is critical for maintaining the system’s efficiency and performance.

A TXV functions as a metering device, regulating the flow of refrigerant into the evaporator based on the cooling demand. As the load increases—often indicated by a rise in the temperature of the suction line—this typically reflects the need for more cooling. The TXV senses the change in pressure and temperature at the outlet of the evaporator and adjusts its aperture accordingly, enabling a greater volume of refrigerant to flow into the evaporator. This adjustment ensures that the evaporator can absorb the extra heat, thereby optimizing the cooling process and preventing the system from overloading or experiencing a drop in efficiency.

Understanding this function of the TXV is essential for troubleshooting and maintaining cooling systems effectively, ensuring they respond appropriately to varying demands.