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Study on the Optimization of Rankine Cycle Using Ammonia Working Fluid for Ocean Thermal Energy Conversion
Pages: 31-38
Year: Issue:  4
Journal: Ocean Technology

Keyword:  ocean thermal energy conversion(OTEC)Rankine Cycleammonia working fluid;
Abstract: In order to obtain the maximum net output of the Rankine Cycle system under ocean temperature difference, theoretical analysis and numerical simulation were conducted on the Rankine Cycle under various working conditions, with warm seawater of 27 ℃, cold seawater of 5 ℃, evaporating temperature ranging from23 ℃ to 25 ℃ and condensing temperature from 5 ℃ to 9 ℃, so as to derive the change rule among system efficiency, evaporating temperature and condensing temperature, as well as the varying modes of various factors under different temperature range and heat-transfer temperature difference, including net output, circulating seawater flow and the heat interchanging area of the heat exchanger. The results indicate that the system efficiency improves with the decrease of evaporating temperature and the increase of condensing temperature, and the optimal net output appears under appropriate temperature difference. The study conducted in this paper is practical and instructive for working condition selection and optimization of the ocean thermal energy conversion(OTEC) system.
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