An average householder uses 160 litres day-1 hot water at a temperature of 55oC, and the specific heat of water is 4.1868 kJ kg-1oC-1 and the inlet temperature of the water to the house is 10°C. Estimate the total energy requirement for hot water supply. If a 2 m2 solar collector is installed to save electricity for hot water supply, the efficiency of the solar panel is 55%. Assuming the mean availability of solar energy throughout the year is 115 Wm-2, the cost of electricity is 5.87p kWh-1, the total cost of the installation is £2000, and it has a life span of 20 years, is the scheme cost effective at a 0% discount rate?
I got the total energy required to heat the water as 11.47GJ/Annum and that its not cost effective as the solar panles will provide 34.7% of the heating requirement which is equilivent to £1300 over 20 years, thus as it cost £2000 to install, its not worth it.
Is this correct? I feel i have done it wrong
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