What is the expected behavior of refrigerant as it passes through the expansion device?

As refrigerant passes through the expansion device, it undergoes a drop in pressure and temperature. The purpose of the expansion device, whether it be an expansion valve or a capillary tube, is to allow the refrigerant, which is in a high-pressure liquid state after leaving the condenser, to expand. When the refrigerant expands, its pressure decreases, and in accordance with thermodynamic principles, this drop in pressure leads to a reduction in temperature. This cooling effect is essential for preparing the refrigerant to absorb heat in the evaporator, thereby facilitating the overall refrigeration cycle.

Understanding this process is crucial for effectively managing refrigeration systems. The behavior of refrigerants as they traverse the expansion device is a foundational concept in ammonia refrigeration and impacts system efficiency and performance.