Thermodynamic and economic analysis of ocean thermal energy conversion system using zeotropic mixtures

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-11-12 DOI:10.1016/j.csite.2024.105408

Yanmei Zhang , Jiawei Deng , Zilong Deng

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Abstract

Zeotropic mixtures offer a promising strategy for enhancing the thermodynamic efficiency and economic feasibility of ocean thermal energy conversion (OTEC) systems. This study investigates two binary mixtures containing R32: R32/R125 and R32/R134a. Through the development of comprehensive thermodynamic and economic models, the research examines the impact of mass fraction and evaporation temperature on the efficiency and cost-effectiveness of the OTEC system. The results indicate that, especially at high evaporation temperatures, the R32/R134a mixture—characterized by significant temperature glide—substantially increases the total energy production capacity of the OTEC system. Compared to pure R32, the OTEC with R32/R134a (mass fraction of R32 is 0.55) has a net output power increase of 9.87 kW and a reduction in LCOE of about 61.4 %. In addition, the advantages of R32/R125 mixtures over pure working fluids are not significant due to the small glide temperature. Ultimately, this investigation enhances the overall performance of OTEC systems, thereby supporting sustainable energy solutions for island communities.

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使用各向同性混合物的海洋热能转换系统的热力学和经济分析

各向同性混合物为提高海洋热能转换（OTEC）系统的热力学效率和经济可行性提供了一种前景广阔的策略。本研究调查了两种含有 R32 的二元混合物：R32/R125 和 R32/R134a。通过开发综合热力学和经济模型，研究探讨了质量分数和蒸发温度对 OTEC 系统效率和成本效益的影响。研究结果表明，特别是在高蒸发温度下，R32/R134a 混合物具有显著的温度滑动特性，可大幅提高 OTEC 系统的总能源生产能力。与纯 R32 相比，使用 R32/R134a 的 OTEC（R32 的质量分数为 0.55）净输出功率增加了 9.87 千瓦，LCOE 降低了约 61.4%。此外，由于滑行温度较低，R32/R125 混合物与纯工作液相比优势并不显著。最终，这项研究提高了 OTEC 系统的整体性能，从而为岛屿社区的可持续能源解决方案提供了支持。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.