21. In a steady flow air enters the system at a pressure of 10 bar and 200°C with a velocity of 100 m/s and leaves at 1.5 bar and 25°C with a velocity of 50 m/s. The temperature of the surroundings is 25°C and pressure is 1 bar. Determine reversible work and actual work assuming the process to be adiabatic. Determine also the irreversibility and effectiveness of the system on the basis of one kg of air flow. Take for air : e, = 1 kJ/kg K; R = 287 J/kg K. (Ans. 200.65 kJ ; 178.75 kJ/kg, 21.90 kJ/kg ; 0.894]

Elements Of Electromagnetics
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21. In a steady flow air enters the system at a pressure of 10 bar and 200°C with a velocity of 100 m/s and leaves
at 1.5 bar and 25°C with a velocity of 50 m/s. The temperature of the surroundings is 25°C and pressure is
1 bar. Determine reversible work and actual work assuming the process to be adiabatic.
Determine also the irreversibility and effectiveness of the system on the basis of one kg of air flow.
Take for air : e, = 1 kJ/kg K ; R = 287 J/kg K.
(Ans. 200.65 kJ ; 178.75 kJ/kg, 21.90 kJ/kg ; 0.894]
Transcribed Image Text:21. In a steady flow air enters the system at a pressure of 10 bar and 200°C with a velocity of 100 m/s and leaves at 1.5 bar and 25°C with a velocity of 50 m/s. The temperature of the surroundings is 25°C and pressure is 1 bar. Determine reversible work and actual work assuming the process to be adiabatic. Determine also the irreversibility and effectiveness of the system on the basis of one kg of air flow. Take for air : e, = 1 kJ/kg K ; R = 287 J/kg K. (Ans. 200.65 kJ ; 178.75 kJ/kg, 21.90 kJ/kg ; 0.894]
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