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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 347,873 edits and uploaded 27,626 files.
Browse our categories or all 7,451 articles.

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Announcements — more

Aprologo-old.png As we approach our ten-year anniversary, we are looking at how best to support Appropedia in the next ten years. Please share your thoughts with us on the idea of appointing an Executive Director.


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DC circuit analogy: 1 Tank 2 Parallel Blenders

Electricity basics. Some basic definitions, equations and analogies of electricity.
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Photovoltaic vaccine refrigeration at Centro De Salud

Building a solar powered (photovoltaic) vaccine refrigerator with a community hospital in Northern Mexico. Now the sun helps keep the vaccines consistently cold.

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Community action news

Tramway de barcelone 1.jpg
Jan 18 Barcelona Crowdsourced its Sharing Economy Policies. Can Other Cities Do the Same? [1]

Jan 17 Why Women in Brazil Are Turning to the Solidarity Economy [2]

Jan 17 Towards sustainable economies: Here's How Fab Market is Creating a Sustainable Marketplace [3]

Jan 17 India news: Solar power plan set to bring fresh water to out-of-reach villages [4]

Jan 16 Spain: Madrid’s mayor is determined to clean up its air – by pedestrianising its biggest shopping street [5]

Read More...


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Henry David Thoreau
For it matters not how small the beginning may seem to be: what is once well done is done forever.

Henry David ThoreauW
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Hot topics / In the news

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Blog

Planted cattails at Millcreek greywater
Greywater, sometimes also spelled as graywater, grey water or gray water, is all of the effluent water from a household, such as water discharged from lavatories (bathroom sinks), bathtubs, showers, clothes washers, and laundry trays. Greywater is not wastewater from a sink used for food preparation, or water closet (toilet) wastewater.

The water leaving our homes carries nutrients and value. It may also contain pathogens, and/or harsh chemicals and care should be taken with it. However, it is not a great risk compared to blackwater (sewage).

Redirecting the water we use for tasks such as showering allows us to reclaim some of that value to grow plants and recharge the water table. It may be necessary to choose our soaps and detergents more carefully, if we use the greywater for watering and fertilizing plants.

Main portal: Water
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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.

Chris's ENGR305 Solar Food Dehydrator

A hybrid, solar food dehydrator  
Compressed earth brick press

An exploration of compressed earth bricks  
Deidre's vertical vegetable garden

Solar powered vertical vegetable garden  
Devan's vertical axis wind turbine

Experimental Vertical Axis Wind Turbine  
Engr305 peanut sheller project

Peanut sheller made from clay and newspaper  
Engr305 pulser pump

A working model of a Pulser pump  
Engr 305 solar learning station

Instructional Solar Learning Station  
ENGR305 windbelt

Testing new materials for prototype windbelts  
Ethanol from organic sugar beets versus refined cane sugar

Determining the cost inputs and energy outputs of small scale ethanol production  
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Selected categories

Topics
Energy

Solar
Water
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Construction zone — correct mistakes & flag spam as needed

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Under construction
New pages being developed:
  1. Bicycle power
  2. Bike power
  3. Timber
  4. Solar Floatovoltaics
  5. Optimal angle of concentrators for panels at different lattitudes
  6. Solar floatovoltaics lit review
  7. Community solar
  8. Photovoltaic Literature Reviews
  9. Grid Isolated Solar Photovoltaic Systems - Lit Review
  10. Solar Concentrateed Water Heater

Note: Appropedia's newest pages may not yet comply with our policies. Page titles in italics are "redirects," often created when moving a page.

Under construction

Create a new page:

  1. Nutrition
  2. Bacteria‏‎
  3. Human development
  4. Environmental science
  5. Open sustainability
  6. New Urbanism‏‎
  7. Building management systems
  8. Science‏‎
  9. Microgeneration
  10. Environmental design

These red links are invitations for you to contribute your knowledge.

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Newest files - images and documents that can be added to pages more

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We want your projects, current works, observations and wisdom! See Contributing content. Improve articles by clicking "edit" at top of the page or section. Our philosophy is: Be Bold and contribute!

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