Q4. (a) Write the steady flow energy equation for open system flow process. (05 marks) (b) Air at a temperature of 15°C

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Q4 A Write The Steady Flow Energy Equation For Open System Flow Process 05 Marks B Air At A Temperature Of 15 C 1 (119.98 KiB) Viewed 44 times

Q4. (a) Write the steady flow energy equation for open system flow process. (05 marks) (b) Air at a temperature of 15°C passes through a heat exchanger at a velocity of 30 m/s where its temperature is raised to 800°C. It then enters a turbine with the same velocity of 30 m/s and expands until the temperature falls to 650°C. On leaving the turbine, the air is taken at a velocity of 60 m/s to a nozzle where it expands until the temperature falls to 500°C. If the air flow rate is 2 kg/s, calculate the following. (i) Rate of heat transfer to the air in the heat exchanger, (ii) Power output from the turbine assuming no heat loss, and (iii) Velocity at exit from the nozzle, assuming no heat loss. (15 marks) Take the enthalpy of air as h =Cpt, where cp is the specific heat equal to 1.005kJ/kg K and t is the temperature.