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Revision as of 21:00, 12 July 2012 by RichardF (Talk | Contributions) (blog label)

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Sharing knowledge to build rich, sustainable lives.

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

You are welcome to add to and edit Appropedia -
your site to find, co-create and improve the solutions we need. Our vision and mission.

Contributors have made 371,017 edits and uploaded 29,667 files.
Browse our categories or all 7,986 articles.

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Announcements — more

Buckminsterfuller.png Today only - Special invite for Appropedians to the Buckminster Fuller Institute Celebration in San Francisco on April 16th. If you are in the San Francisco Bay Area, check it out, this celebration will be quite excellent.


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The First Rice Hull House
Rice Hulls in Construction. The rice hulls are unique within nature. They contain approximately 20% opaline silica in combination with a large amount of the phenyl propanoid structural polymer called lignin. This abundant agricultural waste has all of the properties one could ever expect of some of the best insulating materials. Recent ASTM testing conducted R&D Services of Cookville, Tennessee, reveals that rice hulls do not flame or smolder very easily, they are highly resistant to moisture penetration and fungal decomposition, they do not transfer heat very well, they do not smell or emit gases, and they are not corrosive with respect to aluminum, copper or steel. In their raw and unprocessed state, rice hulls constitute a Class A or Class I insulation material, and therefore, they can be used very economically to insulate the wall, floor and roof cavities of a super-insulated Rice Hull House. This paper also explains how the structure of such a house can be fashioned out of a variety of engineered lumber products derived from sugarcane rind.
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Asthma inhaler spacers

Spacer for asthma medications made from a 500cc plastic bottle.

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Bill Mollison talking about the future.
You don't have a snail problem, you have a duck deficiency.

Bill MollisonW
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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Engr305 Appropriate Technology Projects: Below are selected service learning projects from Engr305 Appropriate Technology, which is a course on appropriate technology at Humboldt State University taught by instructor Lonny Grafman.

Papasan Chair Solar Cooker

A solar cooker and chair when not in use  
Parabolic basket and tin can solar cooker

Solar cooker out of local invasive species and waste materials  
Plastering CCAT Earthbag Terrace

A sturdy, natural plaster covering to the EarthBag gardening terrace being built in front of CCAT  
Rocket stove biomass charcoal

Use of biomass waste charcoal briquettes for rocket stove  
Rowan's portable pedal power generator

A pedal power generator  
Small greenhouse rainwater catchment

A rainwater catchment system for a greenhouse  
Solar Charged Lawnmower

An electric lawnmower that utilizes solar power as an energy source  
Solar heating box

A passive solar heating box  
Sunbrella

An umbrella in the rain, a solar cooker in the Sun  
Sunny Brae Middle School Garden

A garden at Sunny Brae Middle School  
Sunny Brae rainwater catchment system

A residential rainwater catchment system  
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New pages being developed:
  1. Jellybox improvement based on 12. Equipotentiality
  2. Jellybox improvement based on 8. Counterweight
  3. Jellybox improvement based on 39. Inert environment
  4. Jellybox improvement based on 38. Use strong oxidisers
  5. Jellybox improvement based on 36. Phase transition
  6. Jellybox improvement based on 34. Rejecting and regenerating parts
  7. Jellybox improvement based on 29. Use pneumatic or hydraulic systems
  8. Jellybox improvement based on 28. Replacement of a mechanical system
  9. Jellybox improvement based on 24. Mediator
  10. Jellybox improvement based on 22. Convert harm into benefit

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