Air at 1 bar and 25°𝐶 enters a compressor at low velocity, discharges at 3 bar, and enters a nozzle in which it expands to a final velocity of 600 𝑚/𝑠 at the initial conditions of pressure and temperature. If the work of compression is 240 𝑘J/kg of air, the amount of heat removed during the compression will be:
A. −90 kJ/kg
B. −80 kJ/kg
C. −70 kJ/kg
D. −60 kJ/kg
Answer:D
Air at 1 bar and 25°𝐶 enters a compressor at low velocity, discharges at 3 bar, and enters a nozzle in which it expands to a final velocity of 600 𝑚/𝑠 at the initial conditions of pressure and temperature. If the work of compression is 240 𝑘J/kg of air, the amount of heat removed during the compression will be:
A. −90 kJ/kg B. −80 kJ/kg C. −70 kJ/kg D. −60 kJ/kg