17 Location: Plant type: To prove the viability of this technology, Okinawa Prefecture has built an OTEC demonstration facility at its Deep Sea Water Research Center on Kume Island, which lies approximately 100 km west of Okinawa Island. The island enjoys a subtropical, temperate climate throughout the year, with an average temperature of 22.7℃. In addition to the generation of electricity, the cold water from this facility is used in agriculture, aquaculture, and other industrial applications.OTEC process overview Kume Island, Okinawa, Japan Ocean Thermal Energy Conversion (OTEC) Capacity: 50 kW Completion: 2013from the warm surface seawater (normally 25℃- 30℃) to the working fluid causes the fluid to vaporize. The vapor drives a turbine to generate electricity. Then, the vapor is transferred to a condenser where it is returned to a liquid state as the result of the transfer of heat to cold seawater that has been taken up from ocean depths of 600 - 1,000 meters and is 5℃ - 7℃. This OTEC technology is regarded as one of the most effective methods for utilizing the ocean’s thermal energy, and it is most suitable in tropical and subtropical regions, where the temperature differences between deep seawater and surface seawater is the greatest.There is considerable interest in capitalizing on OTEC’s potential as a clean, renewable source, and rapid progress in the research Plant InformationThe OTEC plant on Kume IslandOkinawa Prefecture’s efforts to achieve a low carbon societyOkinawa Prefecture is promoting clean energy with the aim of becoming a low-carbon society in the 21st century. Ocean thermal energy conversion (OTEC) technology is particularly well suited for this purpose, and is expected to both reduce the environmental impact that power generation has in the prefecture and lessen the prefecture’s dependence on imported fossil fuels. OTEC, a renewable energy source for the futureAn OTEC system utilizes the temperature differences between warm surface seawater and cold deep seawater to generate electricity. Chlorofluorocarbon (CFC), a low-boiling-point working fluid, is pumped into an evaporator, where the transfer of heat Okinawa Prefecture Deep Sea Water Research CenterYokogawa’s CENTUM VP Utilized at World’s Only Fully Operational Ocean Thermal Power Generation Facility
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