Consider a steady state heat flow through a 12 feet x 14 feet brick wall of thickness 15 inches and thermal conductivity 1.5 btu/(hr-ft-f). on a day when the temperature of the outdoor is 32 f, the house is maintained at 78 f. the temperatures of the inner and outer surfaces of the brick wall are to be 68 f and 41 f, respectively. determine the rate of entropy generation in the wall and the total rate of entropy generation associated with this heat transfer process

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.