The plumbing in your house is 3/4 in. sch 40 galvanized pipe, and it is connected to an 8 in. sch 80 water main in which the pressure is 15 psig. When you turn on a faucet in your bathroom (which is 12 ft higher than the water main), the water flows out at a rate of 20 gpm.
(a) How much energy is lost due to friction in the plumbing?
(b) If the water temperature in the water main is 608F, and the pipes are well insulated, what would the temperature of the water be leaving the faucet?
(c) If there were no friction loss in the plumbing, what would the flow rate be (in gpm)?
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