A house built on a riverside is to be cooled in sum mer by utilizing the cool water of the...

A house built on a riverside is to be cooled in sum mer by utilizing the cool water of the river. A 15-m-long section of a circular stainless-steel duct of 20-cm diameter passes through the water. Air flows through the underwa ter section of the duct at 3 m/s at an average temperature of 15°C. For an overall fan efficiency of 62 percent, determine the fan power needed to overcome the flow resistance in this section of the duct.