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http://dx.doi.org/10.5916/jkosme.2015.39.9.881

Performance analysis of an organic Rankine cycle for ocean thermal energy conversion system according to the working fluid and the cycle  

Kim, Jun-Seong (Department of Marine System Engineering, Graduate School of Korea Maritime and Ocean University)
Kim, Do-Yeop (Nuclear Power Equipment Research Center, Korea Maritime and Ocean University)
Kim, You-Taek (Division of Marine System Engineering, Korea Maritime and Ocean University)
Kang, Ho-Keun (Division of Marine System Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.39, no.9, 2015 , pp. 881-889 More about this Journal
Abstract
Ocean thermal energy conversion is an organic Rankine cycle that generates power using the temperature difference between surface water and deep water. This study analyzes the thermodynamic efficiency of the cycle, which strongly depends on the working fluid and the cycle configuration. Cycles studied included the classical simple Rankine cycle, Rankine cycles with an open feedwater heater and an integrated regenerator, as well as the Kalina cycle. Nine kinds of simple refrigerants and three kinds of mixed refrigerants were investigated as the working fluids in this study. Pinch-point analysis that set a constant pinch-point temperature difference was applied in the performance analysis of the cycle. Results showed that thermodynamic efficiency was best when RE245fa2 was used as the working fluid with the simple Rankine cycle, the Rankine cycles with an open feedwater heater and an integrated regenerator, and when the mixing ratio of $NH_3/H_2O$ was 0.9:0.1 in the Kalina cycle. If the Rankine cycles with an open feedwater heater, an integrated regenerator, and the Kalina cycle were used for ocean thermal energy conversion, efficiency increases could be expected to be approximately 2.0%, 1.0%, and 10.0%, respectively, compared to the simple Rankine cycle.
Keywords
Ocean thermal energy conversion; Organic rankine cycle; Working fluid;
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