Open Cycle OTEC System with Fresh Water Product-Effects of Noncondensable Gases on Performance of a Condenser-

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  • 淡水化機能を有するオープンサイクル海洋温度差発電システム―凝縮器における不凝縮ガスによる凝縮量への影響―
  • タンスイカ キノウ オ ユウスル オープンサイクル カイヨウ オンドサ ハツデン システム ギョウシュクキ ニ オケル フギョウシュク ガス ニ ヨル ギョウシュクリョウ エ ノ エイキョウ
  • -Effects of Noncondensable Gases on Performance of a Condenser-
  • -凝縮器における不凝縮ガスによる凝縮量への影響-

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Abstract

An open-cycle ocean thermal energy conversion (OC-OTEC) system is one of energy conversion methods to generate electricity from ocean thermal energy. For OC-OTEC system, steam evaporated from the surface seawater due to flash evaporation drives the turbine. At that time, dissolved gas such as air is introduced into the low-pressure system (OC-OTEC system) as the non-condensable gas, which degrades the performance of condensation heat transfer. <br>In this paper, a small scale OC-OTEC experimental unit experimentally investigates the effect of non-condensable gas on the heat transfer performance in a condenser. The experimental results are discussed in comparison with theoretical estimation by Sparrow-Lin method. It is shown that the condensation is occupied by heat and mass transfer near a condensation surface and that the condensation efficiency is affected by exhaust quantity of non-condensable gas at relative high concentration ratio of condensable gas.

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