If using a TXV, which type of evaporator is typically employed?

A TXV, or thermostatic expansion valve, is commonly used in direct expansion (DX) systems. In a DX evaporator, the refrigerant is directly expanded in the evaporator coil, allowing it to absorb heat from the surrounding environment, such as air or water, resulting in a cooling effect. The TXV effectively modulates the flow of refrigerant entering the evaporator based on the cooling load and the temperature conditions, ensuring that the evaporator operates efficiently and preventing issues such as underfeeding or flooding with refrigerant.

In contrast, flooded evaporators rely on constant liquid refrigerant flow, and typically do not use TXVs because they operate at a different principle, where refrigerant is kept in a liquid state throughout the evaporator. Other evaporator types, such as overfeed or gravity systems, also differ in their operational principles and would not utilize a TXV for optimal performance. This specific application of a TXV with a DX evaporator underscores the importance of matching control devices with appropriate refrigeration systems for efficient operation.