You are an engineer working for an aquaculture firm that is raising brackish water fish. Natural sea water contains approximately 3.5 g/L of salt; brackish water ranges in salt concentration from 0.5 - 2.0 g/L salt. You need to supply an aquaculture tank with a continuous supply of water containing 3 g/L of salt at a flow rate of 2,000 L/hr. You would like to blend the water from a well containing 1.25 g/L of salt with water from a well containing 3.75 g/L of salt. Calculate the required volumetric flow rate from each well assuming steady state conditions.

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.