Water flows through a shower head steadily at a rate of 20 L/min. An electric resistance heater placed in the water pipe

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Water Flows Through A Shower Head Steadily At A Rate Of 20 L Min An Electric Resistance Heater Placed In The Water Pipe 1 (41.73 KiB) Viewed 22 times

Water flows through a shower head steadily at a rate of 20 L/min. An electric resistance heater placed in the water pipe heats the water from 16°C to 43°C. Taking the density of water to be 1 kg/L, determine the electric power input to the heater, in kW. In an effort to conserve energy, it is proposed to pass the drained warm water at a temperature of 39°C through a heat exchanger to preheat the incoming cold water. If the heat ex-changer has an effectiveness of 0.50 (that is, it recovers only half of the energy that can possibly be transferred from the drained water to incoming cold water), determine the electric power input required in this case. If the price of the electric en-ergy is 8.5 e/kWh, determine how much money is saved during a 10-minute shower as a result of installing this heat exchanger.