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Windmillprint-crop.jpg Yes it is possible to print a windmill with a 3D printer for a fraction of the cost of manufacturing one conventionaly. Learn more about open-source 3-D printing of open source appropriate technology for sustainable development.


Solar heater
Solar hot water describes active and passive solar technologies that utilize the sun’s freely abundant solar thermal energy in order to heat water for a desired application. It is one of the most efficient ways to heat water (in terms of energy/waste), as it requires no energy conversion, unlike electric-resistance heating or fuel burning. It is a simple transfer and concentration of heat energy from one place to another. Another interpretation of the efficiency of the practice is that the solar energy is free, and only dependent on the extent of the technology used, and its cost and efficiency. In other words, the energy is free, only the collection, conversion, and storage devices cost.

If you have ever felt hot water trickle out of a garden hose that’s been sitting in the sun, you’ve experienced solar hot water in action. Essentially, a solar hot water system is made up of a solar thermal collector, a well-insulated storage container, and a system for transferring the heat from the collector to the container vis-à-vis a fluid medium, which in some circumstances is the water to be used itself.

Open_source_3-D_printing_of_OSAT

Open source 3D printers, such as the Rep Rap, are being used to create open source appropriate technologies such as the DremelFuge.

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People, their buildings and the ways they organise themselves are central to permaculture. Thus the permaculture vision of permanent (sustainable) agriculture has evolved into one of permanent (sustainable) culture.

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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HSU Chiapas Program 2010: Humboldt State University's 2010 summer immersion in Appropriate Technology and Spanish Language & Culture took place in San Cristóbal de las Casas, Chiapas, Mexico. In 2010, we worked with Otros Mundos and various community members in San Cristobal de las Casas and near Acteal to collaboratively build three improved cookstoves, three rainwater catchment systems, windbelt prototypes, microhydro power feasibility studies, and a biogas digestor.

Practivistas Chiapas 2010 Projects
HSU Chiapas improved cookstoves
Improved cookstoves at Otros Mundos and in a rural community
(en español)  
HSU Chiapas micro hydro feasibility study
Microhydro feasibility study in a few rural communities
(en español)  
HSU Chiapas Windbelt ASE
Windbelts at Otros Mundos
(en español)  
HSU Chiapas biodigester
Biodigester at a demo house in San Cristobal  
HSU Chiapas rainwater catchment
Rainwater catchment systems at a demo house and in a rural community
(en español)  

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