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Lect17 -- Solar

Hlpwwwreukcoukbuild a concentrated solar water

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Unformatted text preview: tricity Home solar heater panels Solar Panel absorbs sunlight, coils get heated, fluid carries energy to hot water heater. hLp://www.reuk.co.uk/Build- a- Concentrated- Solar- Water- Heater.htm Concentrating solar heater Reflect light to central tube and absorb into black pipe at focus of parabola hLp://www.reuk.co.uk/Build- a- Concentrated- Solar- Water- Heater.htm Heating your home with solar heating •  Typical showers are about 10 minutes at 2 gallons per minute, or 20 gallons. •  Assume four showers, and increase by 50% for other uses (dishes, laundry) and storage inefficiencies: –  20×4×1.5 = 120 gallons ≈ 450 liters •  To heat 450 l from 15 ºC to 50 ºC requires: (4184 J/kg/ºC)×(450 kg)×(35 ºC) = 66 MJ of energy •  Over 24-hour day, this averages to 762 W •  At average insolation of 200 W/m2 at 50% efficiency, this requires 7.6 m2 of collection area –  about 9-feet by 9-feet, costing perhaps $6–8,000 Problems with home solar heaters 1.  2.  3.  4.  5.  6.  7.  8.  Clouds Shadows from trees Less sun in winter when heat is needed most No sun at night w...
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