Ocean Thermal Energy Conversion

Japanese: 海洋温度差発電 - かいようおんどさはつでん

Also known as ocean thermal energy conversion. Power generation using the difference in water temperature between the ocean surface and the ocean floor. Fluids with low boiling points (ammonia, freon, etc.) are vaporized using the heat from the ocean surface to turn a turbine and generate electricity with a generator. The fluid leaving the turbine is then returned to liquid form using cold water from the ocean floor, and the process is repeated. The United States, France, Japan, and other countries are advancing development of this method, and in the United States, 50kW was generated on the island of Hawaii in 1979, while in Japan, Tokyo Electric Power Company succeeded in generating 100kW in the Republic of Nauru in 1981. In Japan, Kyushu Electric Power has a 50kW test facility on Tokunoshima Island, and Saga University has a 75kW test facility in Imari.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

オテック（ocean thermal energy conversion）とも。海面と海底の水温の差を利用した発電。沸点の低い流体（アンモニア，フロンなど）を海面の熱で気化させてタービンを回し発電機で発電する。タービンを出た流体は再度海底の冷水で液体に戻し，これをくり返す。米国，フランス，日本などが開発を進めており，米国では1979年にハワイ島で50kWの発電に，日本では東京電力が1981年ナウル共和国で100kWの発電に成功。日本国内では九州電力が徳之島に50kW，佐賀大学が伊万里に75kWの試験施設を置いている。
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