When does a TXV respond to changes in load conditions?

The correct choice highlights that a TXV, or thermostatic expansion valve, is designed to respond to changes in load conditions by adjusting the flow rate of refrigerant. In situations where the cooling load decreases, the TXV will reduce the flow rate of refrigerant into the evaporator. This adjustment ensures optimal operational efficiency and maintains the proper superheat level, allowing the system to adapt to varying thermal loads effectively.

When the load conditions increase, the TXV reacts by allowing a higher refrigerant flow rate, but in this context, the focus is on the scenario where the load diminishes. It is critical for the TXV to reduce flow to prevent flooding of the evaporator and inefficient cooling performance. Therefore, recognizing that load conditions directly influence the flow adjustments made by the TXV underscores its role in managing refrigerant flow based on demand, ensuring system reliability and efficiency.