Air enters a compressor at 100 kPa and 27 oC and exits at 700 kPa and 227 oC. The compressor is adiabatic and the volumetric flow rate at the exit of the compressor is 17 L/s. For this compressor changes in kinetic and potential energies are negligible. If the compressor operates at steady state, find the input power to the compressor in kW.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.