Agas within a piston-cylinder assembly undergoes the following thermodynamic cycle with no changes in kinetic or potential energy: 1 bar, v 2 m3 to v2 0.2 m2, u2-u process 1-2: compression with pv - constant, from p - 100 kj. process 2-3: constant volume to p3 p process 3-1: constant pressure and adiabatic process. a)-sketch the cycle on a p-v diagram (with the p, v values for each state).b)- calculate the net work of the cycle and heat transfer for process 2-3, in kj. c)-is this a power or refrigeration cycle?

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.