Carbon dioxide gas is compressed at steady state from a pressure of 16 lb;/in? and a temperature of 32°F to a pressure of 50 Ib:/in? and a temperature of 120°F. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 3000 lb/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with c, = 0.21 Btu/lb-°R and neglect potential energy effects. Determine the flow area at the inlet, in ft?, and the power required by the compressor to work, in horsepower.

Calculate the compressor work in kJ required to compress 1 kg of an ideal gas from an initial volume and pressure of 0.65m3 and 101.3kpa to a final pressure of 517kpa. Compression is with n=1.35. A. 133.6           B. 105.8            C. 148.3           D. 142.7

1. Combustion gases enter the nozzle of a jet engine at 3.8 bar and 820°C. The nozzle is well insulated and the gases expand down to an exit pressure of 1.1 bar. Determine the temperature and the velocity of the gases at exit from the nozzle assuming the velocity at inlet is negligible. For the combustion gases take c, = 1.15 KJ/Kg. K and the ratio of specific heats = 1.32

Argon gas flows through a well-insulated nozzle at steady state. The temperature and velocity at the inlet are 550°R and 150 ft/s, respectively. At the exit, the temperature is 460°R and the pressure is 40 Ibf/in?. The area of the exit is 0.0085 ft?. Use the ideal gas model with k = 1.67, and neglect potential energy effects. Determine the velocity at the exit, in ft/s, and the mass flow rate, in Ib/s.