Determine the angle of incidence of radiation on a collector surface located in adelaide at 12 pm (solar time) on february 3rd. the collector surface is tilted at 45° from the horizontal, and its orientation is 40° east of north. answer should be with 1 decimal point precision. use angle of incidence calculator or the provided formula. (1). 10.6 (2). 30.5 (3). 32.9

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.