1. In 1862, Carnegie Kirk attained a temperature of -40.0°C with a reversed Stirling cycle refrigerator. Assuming the environmental temperature was 20.0°C, determine the reversed Stirling ASC coefficient of performance for his unit.
2. A reversed Stirling cryogenic refrigerator is used to produce a temperature of -200.°C in an environment at 20.0°C. Determine the reversed Stirling ASC coefficient of performance of this unit.