バロメトリック型オープンサイクル海洋温度差発電システムの動作特性

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  • Performance Characteristics of Barometric Type Open-Cycle OTEC System
  • バロメトリックガタ オープン サイクル カイヨウ オンドサ ハツデン システム

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Open Cycle-Ocean Thermal Energy Conversion (OC-OTEC) system has a merit to use a heat exchanger of direct contact type without a heat transfer tube. Therefore, it is expected that capital cost of OC-OTEC is reduced by use of this simply designed heat exchanger. However, non-condensable gas are released in a system, because in a direct contact evaporator, the steam driving a turbine is generated by surface sea water including air, and existing air causes the reduction of system performance. From above point of view, we carried out experimental study on operating characteristics and the effect of structure of a heat exchanger and an existing of non-condensable gas on the performance of the direct contact heat exchanger in an experimental apparatus of barometric type OC-OTEC.<br> As the results, the performance of the direct contact evaporator is to be satisfied. However, we can not get the satisfied results in a direct contact condenser. Therefore, we conduct the further experiments through the improvement of the structure of condenser and the control of the existing of non-condensable gas. Finally, we defined that the major factor affecting the system performance is the existing of non-condensable gas, but its effect can ignore when its concentration is below 8%.

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