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Solar Hot Water Heater

Solar Hot Water Heater. Flat Plate Collector Problem. A flat plate solar collector is used as a solar hot water heater. The collector area equals 20 square meters. The collector is located in a location with annual average daily solar insolation equal to 5.0 kWh/square meter/day.

Solar Hot Water Heater

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1. Solar Hot Water Heater

2. Flat Plate Collector Problem A flat plate solar collector is used as a solar hot water heater. The collector area equals 20 square meters. The collector is located in a location with annual average daily solar insolation equal to 5.0 kWh/square meter/day.

3. 1.    Calculate the amount of solar energy incident on this collector each day.   • Solar Energy = • = 5.0 kWh / sq m / day • 20 sq m • = 100 kWh / day

4. 2. Assuming that the efficiency of the solar collector and the rest of the system equals 50%, calculate the average daily energy produced (as hot water) by this system. Express your answer in kWh/day. • Average Produced Energy/day = • = 100 kWh / day • 0.50 • = 50 kWh / day

5. 3.  Calculate the amount of energy produced by this system each year. Express your answer in kWh. • Annual Energy Production = • = 50 kWh/day • 365 day/year • = 18,000 kWh / year

6. 4. Assuming that the solar energy replaces the heating of hot water by electric energy and that electric energy cost 10¢/kWh, calculate the yearly savings in electricity costs as a result of using the solar hot water system. Express your answer in \$/year. • Money Saved = • = 18,000 kWh • \$0.10/kWh • = \$1,800 / year

7. 5. Suppose this solar hot water system were to cost \$5,400 (installed). Calculate the payback period for this system • Payback = Cost / Savings • = \$5,400 / \$1,800 /year • = 3 years

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