What is the typical gas tax/flash/gas percentage in operating an ammonia refrigeration system with the evaporator at 10°F and the condenser at 85°F?

The typical gas tax or flash gas percentage in an ammonia refrigeration system is influenced by the temperatures of the evaporator and the condenser. In this scenario, with an evaporator temperature of 10°F and a condenser temperature of 85°F, the system operates under conditions that yield a gas percentage that reflects the efficiency of the compression and the handling of refrigerant vapor.

A flash gas percentage of around 15% is common in applications where the evaporator and condenser temperatures are aligned with this specific range. At higher evaporator temperatures or lower condenser temperatures, the flash gas percentage could indeed be lower or higher, respectively. However, in this case, the selected value of 15% aligns well with standard operational efficiency metrics for ammonia refrigeration systems operating within these temperature limits.

This percentage indicates how much of the ammonia vapor is not effectively being returned as liquid refrigerant, affecting the overall efficiency and performance of the system. Thus, the answer of 15% accurately reflects the typical operation of such refrigeration systems under the given conditions.