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Passive water heater diagram
Thermosiphoning is considered to be an appropriate technology. This process utilizes natural, renewable resources and the basic laws of thermodynamics to create movement of a heated supply of air or water. The energy source for this process is solar radiation: the energy of the sun is captured in a solar collection device and is transferred to either air or water via conduction. The entire process may be explained by the thermosiphoning effect: When air or water is heated, it gains kinetic energy from the heating source and becomes excited. As a result, the water becomes less dense, expands, and thus rises. In contrast, when water or air is cooled, energy is extracted from the molecules and the water becomes less active. It also becomes more dense, and tends to "sink." Thermosiphoning harnesses the natural density differences between cold and hot fluids, and controls them in a system that produces natural fluid movement.

The passive thermosiphoning of water is the process of heating and moving water within a system without the need or use of electricity. This process functions by utilizing natual phenomena such as solar energy, gravity, and an available water source.

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Solar Charged Lawnmower

Converting a very used gas power lawnmower into a solar charged, low emission, almost silent, lawn cutting machine.

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Community action news

9th Av 30 St bikelane jeh.jpg

Mar 19 New York City news: Composting in NYC [1]

Mar 7 New Zealand: River granted full rights of legal personhood

Mar 5 Sharing cities movement, Barcelona

Mar 5 Norway: Oslo Is (Almost) Car-Free -- And Likes It That Way [2]

Feb 20 Refettorio Gastromotiva, Rio de Janeiro

Read More...


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Joshua M. Pearce
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Blog

Man working in a rice field.
Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism and assimilated by the organism's cells in an effort to produce energy, maintain life, and/or stimulate growth. Historically, people secured food through two methods: hunting and gathering, and agriculture.

Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the development of civilization. In the developed world, industrial agriculture based on large-scale monoculture has become the dominant system of modern farming, although there is growing support for sustainable agriculture (e.g. permaculture or organic agriculture).

Sustainable agriculture is the practice of farming using principles of ecology, the study of relationships between organisms and their environment. It has been defined as "an integrated system of plant and animal production practices having a site-specific application that will last over the long term: satisfy human food and fiber needs; make the most efficient use of non-renewable resources and on-farm resources and integrate, where appropriate, natural biological cycles and controls; sustain the economic viability of farm operations; and enhance the quality of life for farmers and society as a whole.”

Related portal: Permaculture
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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.

Treadmill-a-volt treadmill powered charging

Treadmill power for the Humboldt Bay Center for Sustainable Living  
Troubleshooting the AEF photovoltaic system

Troubleshooting, repairing, testing and maintaining a preexisting off-grid photovoltaic system  
Tule Fog Farm Grassfed Shed

An indoor space for pigs and goats that also restores a previous brownfield while improving the overall natural landscape  
Umbrella solar cooker

A multi-use solar cooker  
Wild Chick Farm

A commercial pastured chicken operation in Arcata, California  
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Water
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