As shown in Fig. P4.68, a power washer used to clean the
Chapter 4, Problem 4.68(choose chapter or problem)
As shown in Fig. P4.68, a power washer used to clean the siding of a house has water entering through a hose at (20 ^{\circ} \mathrm{C}\), 1 atm and a velocity of 0.2 m/s. A jet of water exits with a velocity of 20 m/s at an average elevation of 5 m with no significant change in temperature or pressure. At steady state, the magnitude of the heat transfer rate from the power washer to the surroundings is 10% of the electrical power input. Evaluating electricity at 8 cents per \(\mathrm{kW} \cdot \mathrm{h}\), determine the cost of the power required, in cents per liter of water delivered. Compare with the cost of water, assuming 0.05 cent per liter, and comment.
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