Compressed air

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Compressed air, in some alternative technology contexts, can be one of the basic utilities next to water, electricity and biogas.

• small wind installations, mechanically coupled to an air compressor
• energy storage
• to power pneumatic motors
• compressed air water pump
• various ventilation uses (e.g. air exchange in greenhouses, biomass drying, Passivhaus etc.)
• inflatable structures (greenhouses)
• cooling (possibly via vortex tube)
• generate compressed air via (solar) heat engine that directly powers an air compressor

• Compressed air energy storage and use system

• http://en.wikipedia.org/wiki/Compressed_Air