Potential Installation of Ocean Thermal Energy Conversion Systems with Combined Use of Deep Sea Water

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  • NIWANO Ryo
    Graduate School of Environment and Information Sciences, Yokohama National University
  • HONDO Hiroki
    Graduate School of Environment and Information Sciences, Yokohama National University
  • MORIIZUMI Yue
    Graduate School of Environment and Information Sciences, Yokohama National University
  • TAHARA Kiyotaka
    The Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology

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Other Title
  • 海洋深層水の複合利用を考慮した海洋温度差発電の導入可能性

Abstract

<p>The present study assesses life cycle CO2 (LCCO2) reduction costs of ocean thermal energy conversion (OTEC) systems with combined use of deep sea water by area considering the natural and social conditions in different areas of Japan. This study considers sea surface temperature, climate, region scale, type of grid power and location as regional conditions. The assessment reveals that the LCCO2 reduction cost greatly varies from 860 to 323,000 [JPY/t-CO2] depending on the areas. Areas where LCCO2 reduction costs are less than 30,000 [JPY/t-CO2] are the medium and large scale remote islands of Okinawa, the Okinawa main island, the largescale remote islands of Kyushu, and the large-scale remote islands of Shikoku, where the installation of OTEC systems are promising. There are the two main reasons for the small LCCO2 reduction costs in these areas; first, the amount of power generation is large because of the low latitude. Second, the effect of combined use of deep sea water is large because these areas have large cooling demand due to the low latitude or the large regional scale.</p>

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