Data from tests of a Peerless end suction Type 1440 pump operated at 1750 rpm with a 14.0 in. diameter impeller are: flowrate [gpm] total head [ft] power input[hp]
290 204 30
440 203 35
550 200 40
790 187 45
920 175 50
1280 135 60
Plot the performance curves for this pump; include a curve of efficiency versus volume flow rate. Locate the best efficiency point and specify the pump efficiency, head rise, and flow rateat this point.

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.