Performance analysis of an orgarnic Rankine cycle for a solar-boosted ocean thermal energy conversion system according to working fluids
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Ocean Thermal Energy Conversion is a power generation cycle that utilizes temperature differences between warm surface seawater and cool deep seawater. A study on Solar-boosted Ocean Thermal Energy Conversion (SOTEC) that utilizes not only ocean thermal energy, but also solar thermal energy as a heat source has been recently researched. In SOTEC, the temperature of surface seawater is boosted using a solar thermal collector. The working fluids and cycle configuration are important factors that affect the thermal performance of an organic Rankine cycle in SOTEC. The simple Rankine cycle and the Rankine cycle with an open feedliquid heater were considered in this study. Working fluids were selected depending upon working conditions, environment, and safety factors. Exergy analysis is an important criterion for the thermal performance evaluation of cycles. This study performed exergy analysis on cycles based on SOTEC. This analysis showed that RE245fa2 has the best thermodynamic performance among the working fluids tested. The exergy efficiency of RE245fa2 was 64.76% in the simple Rankine cycle and 67.79% in the Rankine cycle with an open feedliquid heater. In the Rankine cycle with an open feedliquid heater, an increase in thermodynamic performance could be expected in a SOTEC system, compared to the simple Rankine cycle.
Abstract
Ocean Thermal Energy Conversion is a power generation cycle that utilizes temperature differences between warm surface seawater and cool deep seawater. A study on Solar-boosted Ocean Thermal Energy Conversion (SOTEC) that utilizes not only ocean thermal energy, but also solar thermal energy as a heat source has been recently researched. In SOTEC, the temperature of surface seawater is boosted using a solar thermal collector. The working fluids and cycle configuration are important factors that affect the thermal performance of an organic Rankine cycle in SOTEC. The simple Rankine cycle and the Rankine cycle with an open feedliquid heater were considered in this study. Working fluids were selected depending upon working conditions, environment, and safety factors. Exergy analysis is an important criterion for the thermal performance evaluation of cycles. This study performed exergy analysis on cycles based on SOTEC. This analysis showed that RE245fa2 has the best thermodynamic performance among the working fluids tested. The exergy efficiency of RE245fa2 was 64.76% in the simple Rankine cycle and 67.79% in the Rankine cycle with an open feedliquid heater. In the Rankine cycle with an open feedliquid heater, an increase in thermodynamic performance could be expected in a SOTEC system, compared to the simple Rankine cycle.
참고문헌 (15)
- F. Sun, "Optimization design and exergy analysis of organic Rankine cycle in ocean thermal energy conversion", Journal of the Applied Ocean Research, 35, pp.38~46 (2012)
- R. Soto, "Thermal power plant efficiency enhancement with ocean thermal energy conversion", Journal of the Applied Thermal Engineering, 62(1), pp.105~112 (2014)
- M. H. Yang, "Analysis of optimization in an OTEC plant using organic Rankine cycle", Journal of the Renewable Energy, 68, pp.25~34 (2014)
- L. A. Vega, "Ocean thermal energy conversion primer", Journal of the Marine Technology Society, 6(4), pp.25~35 (2003)
- H. J. Kim, "Feasibility study on the commercial plant of ocean thermal energy conversion (OTEC-K50)", Proceedings of the Twenty-second International Offshore and Polar Engineering Conference, pp.763~768 (2012)
- N. Yamada, "Performance simulation of solar-boosted ocean thermal energy conversion plant", Journal of the Renewable Energy, 34(7), pp.1752~1758 (2009)
- B. F. Tchanche, "Low-grade heat conversion into power using organic Rankine cycles - A review of various applications", Journal of the Renewable and Sustainable Energy Reviews, 15(8), pp.3963~3979 (2011)
- 김준성, "작동유체 및 사이클에 따른 해양온도차발전용 유기랭킨사이클의 성능분석", 한국마린엔지니어링학회지, 39(9), pp.881~889 (2015), 한국마린엔지니어링학회[DOI]
- 김준성, "핀치포인트온도차에 따른 해양온도차발전용 유기랭킨사이클의 성능분석", 한국마린엔지니어링학회지, 40(6), pp.476~483 (2016), 한국마린엔지니어링학회[DOI]
- Y. A. Cengel, "hermodynamics" (2011), McGraw-Hill Education Korea
- B. F. Tchanche, "Heat resources and organic Rankine cycle machines", Journal of the Renewable and Sustainable Energy Reviews, 39, pp.1185~1199 (2014)
- S. H. Shin, "A study of ocean thermal energy conversion systems using Kalina cycle and regenerative Rankine cycle", Journal of the Korean Solar Energy Society, 19(3), pp.101~113 (1999)
- 김남진, "해양 온도차발전 시스템의 열역학 사이클에 대한 연구", 한국태양에너지학회 논문집, 26(2), pp.9~18 (2006), 한국태양에너지학회
- D. Wang, "Performance analysis of double organic Rankine cycle for discontinuous low temperature waste heat recovery", Journal of the Applied Thermal Engineering, 48, pp.63~71 (2012)
- H. Aydin, "Off-design performance analysis of a closed-cycle ocean thermal energy conversion system with solar thermal preheating and superheating", Journal of the Renewable Energy, 72, pp.154~163 (2014)