ABE-TSM436_Lecture5

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

This preview shows pages 1–9. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2/3/2010 2 Topics of the Day * Thermal radiation * Active solar heating- Solar water heater * Types of solar heat collectors * Passive solar heating
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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=
2/3/2010 7 Transmittance of Glass (Boyle, 2004)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 24

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

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online