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solar air conditioning
Solar air conditioning refers to any air conditioning (cooling) system that uses solar power.
This can be done through passive solar, solar thermal energy conversion and photovoltaic conversion (sunlight to electricity). The U.S. Energy Independence and Security Act of 2007〔(【引用サイトリンク】 url = http://www.thomas.gov/cgi-bin/query/z?c110:H.R.6.ENR: )〕 created 2008 through 2012 funding for a new solar air conditioning research and development program, which should develop and demonstrate multiple new technology innovations and mass production economies of scale. Solar air conditioning might play an increasing role in zero-energy and energy-plus buildings design.
==History==
In the late 19th century, the most common fluid for absorption cooling was a solution of ammonia and water. Today, the combination of lithium bromide and water is also in common use. One end of the system of expansion/condensation pipes is heated, and the other end gets cold enough to make ice. Originally, natural gas was used as a heat source in the late 19th century. Today, propane is used in recreational vehicle absorption chiller refrigerators. Hot water solar thermal energy collectors can also be used as the modern "free energy" heat source.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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