Thermodynamic analysis and optimization of a transcritical carbon dioxide rankine cycle for ocean thermal energy conversion SCOPUS KCI

Title
Thermodynamic analysis and optimization of a transcritical carbon dioxide rankine cycle for ocean thermal energy conversion
Author(s)
Kim, J.-S.; Yi, J.-H.; Kim, Y.-T.
KIOST Author(s)
Yi, Jin Hak(이진학)
Publication Year
2018
Abstract
Ocean thermal energy conversion is a power cycle that generates power using the temperature difference between the surface water and deep water of the ocean. In this study, the performance analysis of a transcritical carbon dioxide Rankine cycle for ocean thermal energy conversion and optimization using genetic algorithms are conducted. A simple Rankine cycle and a Rankine cycle with a feed-liquid heater are considered, and a solar-boosted ocean thermal energy conversion system is applied to construct a transcritical cycle. From the results of the analysis, the exergy efficiency increased as the turbine inlet temperature increased, and the heat source outlet temperature was lower in the transcritical cycle. The exergy efficiency due to the turbine inlet pressure and the intermediate pressure of a Rankine cycle with a feed-liquid heater were nonlinear, and there was an optimization point. Then, the genetic algorithm calculated the optimal values by reflecting all of the independent variables in the transcritical cycle. From the results of the optimal value analysis, it was found that the exergy efficiency of a Rankine cycle with a feed-liquid heater was improved compared to that of a simple Rankine cycle. © 2018 The Korean Society of Mechanical Engineers.
ISSN
1226-4881
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/1052
DOI
10.3795/KSME-B.2018.42.11.721
Bibliographic Citation
Transactions of the Korean Society of Mechanical Engineers, B, v.42, no.11, pp.721 - 733, 2018
Publisher
Korean Society of Mechanical Engineers
Subject
Carbon dioxide; Energy conversion; Exergy; Genetic algorithms; Liquids; Oceanography; Optimal systems; Rankine cycle; Surface waters; Temperature; Thermal energy; Thermoanalysis; Turbines; Intermediate pressures; Ocean thermal energies; Temperature differences; Thermo dynamic analysis; Transcritical carbon dioxide; Transcritical cycle; Turbine inlet pressure; Turbine inlet temperature; Ocean thermal energy conversion
Keywords
Carbon Dioxide Rankine Cycle; Genetic Algorithm; Ocean Thermal Energy Conversion; Transcritical Cycle
Type
Article
Language
Korean
Document Type
Article
Publisher
Korean Society of Mechanical Engineers
Related Researcher
Research Interests

Ocean Energy-Tidal Current Energy Converter System,Infrastructure Management-Structural Health Monitoring,Offshore Wind,해양에너지-조류발전시스템,시설물 유지관리-구조건전성 평가,해상풍력

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