Abstract This paper proposes two configurations of combined flash-binary geothermal systems for simultaneous power production and water purification. The binary cycles which are combined together in “Series” and “Parallel” configurations are Organic Rankin Cycle (ORC) and Humidification Dehumidification (HDH) desalination system. Some zeotropic mixtures are also utilized as the working fluids of the ORC unit. Based on the thermodynamic analysis, a single-objective Particle Swarm Optimization (PSO), and then a multi-objective Particle Swarm Optimization (MOPSO) are performed on the systems whose two objectives are total output work, W tot , and produced freshwater, m pw . The single-objective optimization results show that the utilization of the zeotropic mixtures in both of the configurations gives higher output work. However, although the use of zeotropic mixtures does not affect the Parallel system's water purification, it leads to lower freshwater production in the Series system. The maximum amounts of W tot and m pw in the single-objective optimization are 5.72 (MW) and 3.93 (kg/s), which are obtained from the Series and the Parallel configurations respectively. The multi-objective optimization, however, gives more reliable outcomes. According to the results of the MOPSO algorithm, the maximum amount of the 1st optimization objective, W tot , for both systems, is 5.87 (MW) and also the maximum value of the 2nd objective, m pw , for both configurations is 11.42 (kg/s). On the other hand, the multi-objective optimization demonstrates that the Series configuration has a better performance than the Parallel system.

中文翻译：

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组合闪蒸二元地热加湿除湿海水淡化系统的多目标元启发式优化

摘要 本文提出了两种组合闪蒸二元地热系统的配置，用于同时发电和水净化。在“串联”和“并联”配置中组合在一起的二元循环是有机兰金循环 (ORC) 和加湿除湿 (HDH) 脱盐系统。一些共沸混合物也用作 ORC 装置的工作流体。基于热力学分析，在两个目标是总输出功 W tot 和生产的淡水 m 的系统上执行单目标粒子群优化 (PSO)，然后执行多目标粒子群优化 (MOPSO)密码。单目标优化结果表明，在两种配置中使用非共沸混合物可提供更高的输出功。然而，尽管使用非共沸混合物不会影响并联系统的水净化，但会导致串联系统中的淡水产量降低。单目标优化中的最大 W tot 和 m pw 为 5.72 (MW) 和 3.93 (kg/s)，分别从串联和并联配置中获得。然而，多目标优化提供了更可靠的结果。根据 MOPSO 算法的结果，两个系统的第一个优化目标 W tot 的最大值为 5.87 (MW)，并且两个配置的第二个优化目标的最大值 m pw 为 11.42 (kg /s)。另一方面，多目标优化表明串联配置比并联系统具有更好的性能。