6. A simple air cooled system is used for an aeroplane to take a load of 10 tons. Atmospheric temperature and is 25°C and 0.9 atm respectively. Due to ramming the pressure of air is increased from 0.9 atm. to 1 atm. The pressure of air leaving the main compressor is 3.5 atm and its 50% heat is removed in the air-cooled heat exchanger and then it is passed through a evaporator for future cooling. The temperature of air is reduced by 10°C in the evaporator. Lastly the air is passed through cooling turbine and is supplied to the cooling cabin where the pressure is 1.03 atm. Assuming isentropic efficiency of the compressor and turbine are 75% and 70%, find a) Power required to take the load in the cooling cabin b) COP of the system. The temperature of air leaving the cabin should not exceed 25°C. pressure

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