Liquid water and water vapor (steam) are mixed in a mixing chamber to raise the temperature of water. the chamber has two inlets and a single exit and operates at steady state. the following data are provided at the two inlets and one exit. inlet-1 (state-1): p=500 kpa, t=30 deg-c, a = 0.01 m2, vel = 10 m/s, v=0.001004 m3/kg; inlet - 2: (state-2): water vapor at p =500 kpa, vel = 20 m/s, a = 0.1 m2, v = 0.376 m3/kg; exit (state-3): hot water at p= 500 kpa, v=0.0010 m3/kg, a = 0.01 m2

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.