ESCO Air Conditioning Practice Exam

The purpose of a thermostatic expansion valve (TXV) is to optimize refrigerant flow based on the cooling load. The TXV functions by adjusting the flow of refrigerant into the evaporator coil according to the temperature and pressure of the refrigerant. This is crucial for achieving efficient cooling because it ensures that the right amount of refrigerant is delivered to the evaporator based on the current demand for cooling.

When the cooling load increases, the TXV allows more refrigerant to flow into the evaporator, ensuring that it can absorb more heat and maintain the desired indoor temperature. Conversely, when the cooling load decreases, the TXV restricts the flow of refrigerant, preventing unnecessary energy loss and improving overall system efficiency. By accurately regulating the refrigerant based on the load, the TXV helps maintain optimal performance and energy efficiency in air conditioning systems.