ABE-TSM436_Lecture5 - Solar Heating Question of the Day How...

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2/3/2010 1 Solar Heating Question of the Day: How much energy is needed for heating your home per year? How can the solar energy be utilized for heating? NCSU Solar House NCSU Solar House
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2/3/2010 2 Topics of the Day * Thermal radiation * Active solar heating- Solar water heater * Types of solar heat collectors * Passive solar heating
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2/3/2010 3 Solar Technologies Technologies that have been developed to take advantage of solar energy: ¾ Active solar heating - hot water ¾ Passive solar heating and daylighting ¾ Solar process heat and space heating and cooling. ¾ Concentrating solar power – solar thermal engines ¾ Photovoltaic (solar cell) systems
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2/3/2010 4 Thermal Radiation Where: α = the absorptance ρ = the reflectance τ = the transmittance ρ = 0, blackbody τ = 0, opaque surface 1 = + + τ ρ α α ρ τ ¾ Thermal radiation: 0.1 – 100 μ m in wavelengths
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2/3/2010 5 Radiant Emitter ¾ Lower-temperature surfaces are primarily emitters of long-wavelength radiation ¾ Higher-temperature surfaces are primarily emitters of short-wavelength radiation ) ( 2898 ) ( ) ( 6 . 5215 ) ( max max K T m R T m = = μλ 67 . 491 ) ( 5 9 67 . 459 ) ( ) ( + = + = C F R o o o (°K) = (°C) + 273.15 (°F) = 9/5 x (°C) + 32
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2/3/2010 6 Emittance Where: E B = emitted energy by blackbody ε = emittance of the real surface E = emitted energy by real surface ¾ Emittance can vary with T and conditions of the surface ¾ For each wavelength: B E E = λλ α=
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2/3/2010 7 Transmittance of Glass (Boyle, 2004)
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2/3/2010 8 Solar Water Heater Solar water heaters is also called solar domestic hot water systems. Solar water heating systems include storage tanks and
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ABE-TSM436_Lecture5 - Solar Heating Question of the Day How...

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