The cockpit of a jet plane is to be cooled by a simple air refrigeration system. The data available is as follows: Cock-pit cooling load 20 TR Speed of the plane = 1000 km/h Ambient air pressure = 0.35 bar Ambient air temperature = -15°C Ram efficiency = 90% Pressure ratio in the main compressor = 3 Pressure drop in the heat exchanger = 0.1 bar Isentropic efficiencies of main compressor and cooling turbine = 80% Temperature of air entering the cooling turbine = 30°C Pressure of air leaving the cooling turbine = 1.06 bar Pressure in the cock-pit = 1 bar If the cock-pit is to be maintained at 25°C, find : 1. Stagnation temperature and pressure of air entering the main compressor ; 2. Mass flow rate of air to cock-pit ; 3. Power required to drive the refrigerating system; and 4. C.O.P. of system.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
The cockpit of a jet plane is to be cooled by a simple air refrigeration system. The data available is as follows: Cock-pit cooling load 20 TR Speed of the plane = 1000 km/h Ambient air pressure = 0.35 bar Ambient air temperature = -15°C Ram efficiency = 90% Pressure ratio in the main compressor = 3 Pressure drop in the heat exchanger = 0.1 bar Isentropic efficiencies of main compressor and cooling turbine = 80% Temperature of air entering the cooling turbine = 30°C Pressure of air leaving the cooling turbine = 1.06 bar Pressure in the cock-pit = 1 bar If the cock-pit is to be maintained at 25°C, find : 1. Stagnation temperature and pressure of air entering the main compressor ; 2. Mass flow rate of air to cock-pit ; 3. Power required to drive the refrigerating system; and 4. C.O.P. of system.
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