What would be the % of flash/tax gas produced if one pound of liquid Ammonia would convert to gas across the expansion valve with 95ºF condensing temperature and -40ºF evaporating temperature?

To determine the percentage of flash/tax gas produced from the expansion of one pound of liquid ammonia through an expansion valve, we must consider the thermodynamic properties of ammonia at the given condensing and evaporating temperatures.

At a condensing temperature of 95ºF, ammonia exists in a liquid phase, while at -40ºF, it is in a gaseous state. When the liquid ammonia passes through the expansion valve, it experiences a drop in pressure and temperature, which causes it to partially vaporize. The percentage of the gas produced can be derived from the enthalpy values of ammonia at these specific conditions.

Using the properties from ammonia tables, one can assess the specific enthalpy of the saturated liquid at 95ºF and the saturated vapor at -40ºF. The ratio of the enthalpy change can then be used to calculate the percentage of vapor produced.

The underlying calculation would typically yield around 27% for the amount of flash/tax gas produced, aligning with the first choice. This percentage reflects the efficiency of the phase change occurring in ammonia due to the thermodynamic process initiated by the expansion valve, showing how much of the liquid can convert to gas under the specified conditions. Hence, the answer indicates