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In large buildings, hot water in a water tank is circulated through a loop so that...

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Mechanical Engineering

In large buildings, hot water in a water tank is circulatedthrough a loop so that the user doesn’t have to wait for all thewater in long piping to drain before hot water starts coming out. Acertain recirculating loop involves 300-foot-long, 1-inch--diameterPEX pipes with six 90° threaded smooth bends and two fully opengate valves. The PEX piping is considered to be smooth (roughnessis 0). If the average flow velocity through the loop is 5 ft/s,determine the pump power needed to overcome the loss inwatts to three significant figures. Take the average watertemperature to be 180 F (values for water in the textappendix).

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