If one pound of liquid ammonia converts to gas, what percentage of gas is produced across the expansion valve given specific temperature conditions?

When one pound of liquid ammonia expands and converts to gas across the expansion valve, the percentage of gas produced can be attributed to the thermodynamic properties of ammonia and its behavior during the phase change from liquid to vapor. Under specific temperature and pressure conditions, the expansion process allows the liquid ammonia to evaporate, leading to the generation of vapor.

In the case of ammonia, the typical expansion from liquid to gas is characterized by a significant change in volume. The correct response, which indicates approximately 27% gas production, aligns with the general understanding of the pressure-enthalpy chart used for refrigeration cycles. This chart provides critical insights into how much of the liquid will convert to vapor based on the existing conditions in the system.

Through the expansion valve, some portion of the liquid ammonia will vaporize while the rest remains in liquid form. The 27% figure corresponds to a scenario where the system efficiently utilizes the refrigerant's properties, balancing phase change and maintaining operational efficiency.

Understanding these thermodynamic principles is crucial in ammonia refrigeration systems, as they impact the overall efficiency and effectiveness of the refrigeration cycle. Knowing the percentage of gas produced helps in designing and troubleshooting the system for optimal refrigeration performance.