Thermodynamic and thermoeconomic evaluation of integrated hybrid solar and geothermal power generation cycle

IF 7.1 Q1 ENERGY & FUELS
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引用次数: 0

Abstract

The present investigation examines geothermal and solar energy for electricity generation. The proposed cycle can generate electricity independently or jointly using geothermal and solar sources. Organic Rankine Cycles (ORCs) have been employed due to their positive effects, including improved efficiency, comprehensive performance and economic analysis, adaptability, and the benefits of using ORCs with refrigerants in the hybrid power generation system. The proposed system is designed to include two evaporators, each working at distinct temperature levels, with one running at a high temperature and the other at a low temperature. Consequently, the system is outfitted with a pair of turbines functioning at elevated and moderate pressures. The analysis of the performance of the suggested cycle was conducted considering both energy and exergy perspectives; this leads to the determination of the efficiency of the first and second laws of thermodynamics. As a result, the exergy loss amount was calculated, and the exergy utilization efficiency for each component was determined. To assess the financial implications of the end product, a comprehensive study including electricity and exergy economic factors was conducted. A sensitivity analysis for many different aspects of the design factors and a parametric study, such as the difference in temperature at the pinch point and the temperature of the evaporator and their effects on energy and exergy performance, as well as the cost, are done. Findings revealed that the high-pressure turbine is directly related to the highest second-law efficiency. In contrast, the low-pressure turbine had the highest value for the exergy economic component. The average cost of energy production, obtained by evaluating power generation through low-pressure and high-pressure turbines, was calculated as 27.23 S/Gj. The system presented in this article can expand and adapt to diverse case analyses and can be effectively applied under various climatic conditions.

太阳能和地热综合混合发电循环的热力学和热经济评价
本调查研究了地热和太阳能发电。所提议的循环可独立发电,也可联合使用地热和太阳能发电。有机郎肯循环(ORC)具有积极的作用,包括提高效率、全面的性能和经济分析、适应性以及在混合发电系统中使用带制冷剂的有机郎肯循环的好处。拟议的系统设计包括两个蒸发器,每个蒸发器在不同的温度水平下工作,一个在高温下运行,另一个在低温下运行。因此,该系统配备了一对涡轮机,分别在较高和较低的压力下工作。对所建议的循环性能进行分析时,既考虑了能量角度,也考虑了放能角度,从而确定了热力学第一和第二定律的效率。因此,计算了放能损失量,并确定了每个组件的放能利用效率。为了评估最终产品的财务影响,进行了一项包括电力和放能经济因素在内的综合研究。对设计因素的许多不同方面进行了敏感性分析,并进行了参数研究,如夹点温差和蒸发器温度及其对能量和放能性能以及成本的影响。研究结果表明,高压涡轮机与最高的二律效率直接相关。相比之下,低压涡轮机的放能经济成分值最高。通过评估低压涡轮机和高压涡轮机的发电量,计算得出能源生产的平均成本为 27.23 S/Gj。本文介绍的系统可扩展并适应不同的案例分析,可在各种气候条件下有效应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.80
自引率
3.20%
发文量
180
审稿时长
58 days
期刊介绍: Energy Conversion and Management: X is the open access extension of the reputable journal Energy Conversion and Management, serving as a platform for interdisciplinary research on a wide array of critical energy subjects. The journal is dedicated to publishing original contributions and in-depth technical review articles that present groundbreaking research on topics spanning energy generation, utilization, conversion, storage, transmission, conservation, management, and sustainability. The scope of Energy Conversion and Management: X encompasses various forms of energy, including mechanical, thermal, nuclear, chemical, electromagnetic, magnetic, and electric energy. It addresses all known energy resources, highlighting both conventional sources like fossil fuels and nuclear power, as well as renewable resources such as solar, biomass, hydro, wind, geothermal, and ocean energy.
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