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首页> 外文期刊>Energy Conversion & Management >Payback period investigation of the organic Rankine cycle with mixed working fluids to recover waste heat from the exhaust gas of a large marine diesel engine
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Payback period investigation of the organic Rankine cycle with mixed working fluids to recover waste heat from the exhaust gas of a large marine diesel engine

机译：有机朗肯循环与混合工作流体的回收期研究，以从大型船用柴油机的废气中回收废热

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The aim of this study is to investigate the payback period and the payback-period reduction of the organic Rankine cycle (ORC) with mixtures for waste heat recovery from the exhaust gas of a large marine diesel engine. Working fluids with zero-ozone-depletion potential, such as R236fa, R245fa, 8600, R1234ze, and their mixtures, are selected to analyze the economic and thermodynamic performances in the conversion cycle. The optimal mass fractions of the mixed working fluids R236fa/R245fa, R236fa/R1234ze, and R600/R1234ze for the lowest payback period with the corresponding optimal expander inlet temperature and condenser outlet temperature of the ORC have been obtained. R600/R1234ze possesses the best performance in terms of payback period. Under optimal conditions, the payback period of the ORC with R600/R1234ze is the lowest and is shorter than that with R236fa, R245fa, MOO, R1234ze, R236fa/R245fa, and R236fa/R1234ze by 7.55%, 6.47%, 9%, 9.17%, 0.9%, and 2.88%, respectively. To evaluate the economic potential of mixed working fluids using different types of expander such as turbine, scroll, and screw expanders properly, the relationships between the isentropic efficiencies of the expander and their corresponding optimal expander inlet temperature and optimal mass fraction are obtained. Optimal correlations are proposed to conveniently predict the optimal mass fractions of the mixtures R236fa/R245fa, R236fa/R1234ze, and R600/R1234ze in the ORC and to assess the reduction of their payback periods for the waste heat recovery of a large marine diesel engine. The results highlight the significant potential of the mixtures used in the ORC for performance improvement and demonstrate the importance of mixture assessment for reducing the payback period in further work.
机译：这项研究的目的是研究有机朗肯循环（ORC）与混合气体的投资回收期和投资回收期的减少，该混合物用于从大型船用柴油机的废气中回收余热。选择具有零臭氧消耗潜能的工作液，例如R236fa，R245fa，8600，R1234ze及其混合物，以分析转化循环中的经济和热力学性能。已经获得了最低回收期的混合工作流体R236fa / R245fa，R236fa / R1234ze和R600 / R1234ze的最佳质量分数，以及ORC的相应最佳膨胀机入口温度和冷凝器出口温度。就投资回收期而言，R600 / R1234ze具有最佳性能。在最佳条件下，R600 / R1234ze的ORC的投资回收期最低，比R236fa，R245fa，MOO，R1234ze，R236fa / R245fa和R236fa / R1234ze的投资回收期短7.55％，6.47％，9％，9.17分别为％，0.9％和2.88％。为了正确地评估使用不同类型的膨胀机（例如涡轮膨胀机，涡旋膨胀机和螺杆膨胀机）的混合工质的经济潜力，获得膨胀机的等熵效率与其相应的最佳膨胀机入口温度和最佳质量分数之间的关系。提出了最佳相关性，以方便地预测ORC中混合物R236fa / R245fa，R236fa / R1234ze和R600 / R1234ze的最佳质量分数，并评估其回收大型船用柴油机废热的投资回收期。结果突出显示了ORC中使用的混合物对改善性能的巨大潜力，并证明了混合物评估对于减少进一步工作的投资回收期的重要性。

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