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Revision as of 11:59, 14 December 2011 by RichardF (Talk | Contributions) (copyedit)

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Sharing knowledge to build rich, sustainable lives.

Appropedia is for collaborative solutions
in sustainability, appropriate technology, poverty reduction, and permaculture.

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To catch the rain cover.png You made it happen! Get a paperback on Amazon or digitally at http://www.tocatchtherain.org.


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Surrey Hills house
Surrey Hills house. In 2001, my partner Lena and I were faced with the prospect of living in a dark and dingy 1930’s duplex “one of a pair” solid brick dwelling built in 1930, renovating it, or buying another house. The old house had a maze of small pokey rooms. We viewed the high cost of selling and buying property, where a lot of money goes to the “middlemen and the taxman”, as a waste of money. We were really keen to make maximum use of the sun for heating and natural lighting, and decided to go ahead with renovating. We prepared a detailed brief covering our requirements, with a strong focus on low environmental impact features. After discussing the project with Andreas and Judy Sederof from Sunpower Design, we felt confident that we could achieve what we wanted, although the site and the existing dwelling presented challenges. It soon became clear to us that the expertise and ideas that experienced “sustainable and solar efficient” architects provide is invaluable.
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CCAT's Vermicomposting Bin

Build your own Vermicomposting System!

The Sun photographed by the Atmospheric Imaging Assembly (AIA 304) of NASA's Solar Dynamics Observatory (SDO).
Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on earth. Only a minuscule fraction of the available solar energy is used.

Solar powered electrical generation relies on heat engines and photovoltaics. Solar energy's uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, solar hot water, solar cooking, and high temperature process heat for industrial purposes.To harvest the solar energy, the most common way is to use solar panels.

Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.

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