1. Reversed Stirling cycle air conditioners were used to cool deep mines until about 1930. If the temperature in the mine was 150.°F and the temperature of the air outside the mine was 60.0°F, determine the reversed Stirling ASC coefficient of performance for the air conditioner.
2. A reversed Stirling cycle heat pump is driven by a 14.0 hp electric motor. It produces a heat transfer rate of 75.0 × 103 Btu/h into the high temperature region at 80.0°F from an environment at 50.0°F. Determine
a. The actual coefficient of performance of the heat pump.
b. The reversed Stirling ASC coefficient of performance for this unit.