# 7. A gas refrigeration system as shown in Fig.??, using air as the working fluid has a pressure ratio of 5. Air enters the compressor at 0 °C. The high pressure air is cooled to 35 °C by rejecting heat to the surroundings. The refrigerant leaves the turbine at -80 °C and then it absorbs heat from the refrigerated space before entering the regenerator. The mass flow rate of air is 0.4 kg/s. Assuming isentropic efficiencies of 80 % for the compressor and 85 % for the turbine and using constant specific heats at room temperature, determine 0.434] 21.4 kW 0.48 (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, (c) the COP of the cycle, and (d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle Use the same compressor inlet temp. as given, the same turbine inlet temperature as calculated, 27.7 kW, 0.599 and the same compressor and turbine efficiencies.

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