Solar panels on roof receive water at 15 degree celsius. During the day panels supply 3.8kg of hot water 65 degree C every hour. Solar power incident on roof during this heating period is 170W/m^2. Solar panels have total area 8m^2. Calculate efficiency of solar panel if specific heat capacity of water = 4200J/(kg Degree C)
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solar panels recive solar enrgy no water
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