해양복합온도차발전용 복수기 증기 취출 유동 해석 (Flow analysis of steam extraction from condenser for C-OTEC)

서지정보

· 발행기관 : 한국유체기계학회
· 수록지 정보 : 한국유체기계학회 논문집 / 24권 / 2호 / 46 ~ 57페이지
· 저자명 : 김일진, 곽다희, 전어진, 허균영, 김형대, 정훈

초록

The concept of C-OTEC (Combined-Ocean Thermal Energy Conversion) was proposed to run a heat engine using the temperature difference between the steam exhausted into the condenser of an existing power plant and the deep sea water. To vaporize a working fluid of the heat engine, saturated steam in the condenser needs to be extracted to the evaporator of C-OTEC. Installation of steam guide vanes inside the condenser is considered to effectively extract steam from the condenser to the C-OTEC evaporator. In the present study, three-dimensional computational fluid dynamics analysis of flow inside the condenser with various sizes of steam guide vanes is conducted. Influences of the steam guide vane size upon flow and pressure distributions in the condenser are analyzed using the conventional CFD method while fluid flow and pressure drops inside small complicated channels of plate-type heat exchanger units in the C-OTEC evaporator is equivalently simulated using the porous medium approach. It is found from the analysis results that as the steam guide vane diameter increases, the steam extraction rate as a figure of merit linearly increases while the condenser pressure rise as a penalty exponentially increases. As a result, an optimal size of the steam guide vane for the condenser analyzed in the present study is proposed.

영어초록

The concept of C-OTEC (Combined-Ocean Thermal Energy Conversion) was proposed to run a heat engine using the temperature difference between the steam exhausted into the condenser of an existing power plant and the deep sea water. To vaporize a working fluid of the heat engine, saturated steam in the condenser needs to be extracted to the evaporator of C-OTEC. Installation of steam guide vanes inside the condenser is considered to effectively extract steam from the condenser to the C-OTEC evaporator. In the present study, three-dimensional computational fluid dynamics analysis of flow inside the condenser with various sizes of steam guide vanes is conducted. Influences of the steam guide vane size upon flow and pressure distributions in the condenser are analyzed using the conventional CFD method while fluid flow and pressure drops inside small complicated channels of plate-type heat exchanger units in the C-OTEC evaporator is equivalently simulated using the porous medium approach. It is found from the analysis results that as the steam guide vane diameter increases, the steam extraction rate as a figure of merit linearly increases while the condenser pressure rise as a penalty exponentially increases. As a result, an optimal size of the steam guide vane for the condenser analyzed in the present study is proposed.

참고자료

· 없음