What effect does an increase of heat on the bulb of a TXV have on the valve?

When heat is added to the sensing bulb of a thermostatic expansion valve (TXV), it causes the diaphragm inside the valve to react to that increase in temperature. The sensing bulb is filled with a refrigerant that expands as it absorbs heat. As the bulb warms up, the refrigerant inside expands and creates more pressure, which pushes against the diaphragm. This action allows the TXV to open more, increasing the flow of refrigerant into the evaporator.

This response is crucial in controlling and optimizing the refrigeration process, as it ensures that the evaporator receives the necessary amount of refrigerant based on the load conditions. Therefore, with an increase in heat, the valve stays open or opens more, allowing for more refrigerant to flow, thereby enhancing the cooling capacity and efficiency of the system.

Understanding this relationship is essential for those working with industrial ammonia refrigeration systems, as it relates directly to system performance and the ability to maintain appropriate temperatures.