Exergoeconomic and multi-objective optimization analyses of an organic Rankine cycle integrated with multi-effect desalination for electricity, cooling, heating power, and freshwater production

Mohammed Ramy H.; Ibrahim Mostafa M.; Abu-Heiba Ahmad

摘要

Efficient utilization of waste heat to run a power and desalination systems is a key technology to mitigate the energy-water crisis. Organic Rankine Cycle (ORC) is one of the promising systems that can exploit low-grade waste heat. So, this paper introduces a novel ORC-based poly-generation system driven by waste heat to produce electrical, cooling, and heating power. The poly-generation system is integrated with multi-effect desalination (MED) system for freshwater production as well. Energy, exergy, and exergo-economic (3E) investigations are made to assess the feasibility of integration of the proposed novel ORC to MED cycle. The new ORC has an adjustable three-way valve to control the seasonal requirement of electrical, heating, and cooling power. Performance of the suggested multi-generation ORC/MED is evaluated by calculating the plant electrical efficiency (eta(elec)), energy utilization factor (EUF), overall exergy efficiency (eta(ex)), total product unit cost (c(p,tot)), electricity cost (C-elec), total water price (TWP), and exergo-economic factor (fk). It is found that the base case of the proposed multi-generation ORC/MED plant could produce electrical power of 8.055 MW at a cost of 1.035 (sic)/kWh, cooling power of 5.239 MW, heating power of 7.579 MW, and freshwater of 66.55 m(3)/h for 0.4136 $/m(3). While the eta(elec), EUF, eta(ex), andcp,tot are 13.38%, 53.27%, 37.22%, and 2.877 $/GJ, respectively. The parametric study indicates that adjusting the ratio of electric power generation to cooling power production has a significant impact on the thermo-economic efficiency of the ORC/MED plant and does not have any effect on the freshwater production. The multi-objective optimization analyses show that the electrical power, cooling power and EUF of the optimized case improve by 16%, 306.6% and 50%, respectively, and the cp,tot and Celec decrease by 16% and 9.5%, respectively.

机译：有效利用废热量运行电力和海水淡化系统是减轻能源水危机的关键技术。有机朗肯循环（ORC）是可以利用低级废热的有希望的系统之一。因此，本文介绍了一种由废热驱动的新型兽人的多代系统，以产生电气，冷却和加热功率。多相发电系统与多效脱盐（MED）系统集成，也具有用于淡水产量的。能源，暴风和exergo-经济（3E）调查，评估拟议的新兽人融合到MED周期的可行性。新的ORC具有可调节的三通阀，可控制电气，加热和冷却功率的季节性要求。通过计算植物电效率（ETA（ELEC）），能量利用因子（EUF），总体高效（ETA（EX）），总产品单位成本（C（P）来评估建议的多代兽人/医学的性能，Tot）），电力成本（C-ELEC），总水价（TWP）和Exergo-经济因素（FK）。结果发现，所提出的多代兽人/ MED植物的基础壳体可以以1.035（SIC）/ kWh，冷却功率为5.239 mW，加热功率为7.579 mW，淡水和淡水66.55 m（3）/ h为0.4136 $ / m（3）。虽然ETA（ELEC），EUF，ETA（EX），ANDCP，TOT分别为13.38％，53.27％，37.22％和2.877美元/ gj。参数研究表明，调节电力发电与冷却功率产生的比率对兽人/药物植物的热经济效率产生重大影响，并且对淡水产生没有任何影响。多目标优化分析表明，优化壳体的电力，冷却功率和EUF分别提高了16％，306.6％和50％，CP，Tot和Celec分别降低了16％和9.5％。

Exergoeconomic and multi-objective optimization analyses of an organic Rankine cycle integrated with multi-effect desalination for electricity, cooling, heating power, and freshwater production

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