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Hybridisation of solar and geothermal energy in both subcritical and supercritical Organic Rankine Cycles

机译：亚临界和超临界有机朗肯循环中太阳能和地热能的混合

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摘要

A supercritical Organic Rankine Cycle (ORC) is renowned for higher conversion efficiency than the conventional ORC due to a better thermal match (i.e. reduced irreversibility) presented in the heat exchanger unit. This improved thermal match is a result of the obscured liquid-to-vapor boundary of the organic working fluid at supercritical states. Stand-alone solar thermal power generation and stand-alone geothermal power generation using a supercritical ORC have been widely investigated. However, the power generation capability of a single supercritical ORC using combined solar and geothermal energy has not been examined. This paper thus investigates the hybridisation of solar and geothermal energy in a supercritical ORC to explore the benefit from the potential synergies of such a hybrid platform. Its performances were also compared with those of a subcritical hybrid plant, stand-alone solar and geothermal plants. All simulations and modelling of the power cycles were carried out using process simulation package Aspen HYSYS. The performances of the hybrid plant were then assessed using technical analysis, economic analysis, and the figure of merit analysis. The results of the technical analysis show that thermodynamically, the hybrid plant using a supercritical ORC outperforms the hybrid plant using a subcritical ORC if at least 66% of its exergy input is met by solar energy (i.e. a solar exergy fraction of ＞66%), namely producing 4-17% more electricity using the same energy resources. Exergy analysis shows that with a solar exergy fraction of more than 66% the exergetic efficiency of the hybrid plant is about 27-34% for the supercritical hybrid plant and 23-32% for the subcritical hybrid plant. The figure of merit analysis indicates that the hybrid plant produces a maximum of 15% (using a subcritical ORC) and 19% (using a supercritical ORC) more annual electricity than the two stand-alone plants. Economically, the hybrid plant using the supercritical ORC has a solar-to-electricity cost of approximately 1.5-3.3% less than those of the subcritical scenario.
机译：超临界有机朗肯循环（ORC）因具有比传统ORC高的转化效率而闻名，这是因为热交换器单元具有更好的热匹配性（即降低了不可逆性）。这种改进的热匹配是有机工作流体在超临界状态下液汽边界模糊的结果。使用超临界ORC的独立太阳能热发电和独立地热发电已得到广泛研究。但是，尚未研究使用太阳能和地热结合的单个超临界ORC的发电能力。因此，本文研究了超临界ORC中太阳能和地热能的混合，以探索这种混合平台的潜在协同作用所带来的好处。还将其性能与亚临界混合电站，独立的太阳能和地热电站的性能进行了比较。使用过程模拟程序包Aspen HYSYS对电源周期进行所有模拟和建模。然后使用技术分析，经济分析和绩效指标分析来评估杂交植物的性能。技术分析的结果表明，在热力学上，如果太阳能至少满足66％的火用输入，即使用超临界ORC的混合动力电厂要优于使用亚临界ORC的混合动力电厂（即，太阳能干比＞ 66％） ，即使用相同的能源可以增加4-17％的电力。火用分析表明，在太阳能用率超过66％的情况下，杂化工厂的超能效率对于超临界杂化工厂约为27-34％，对于次临界杂化工厂约为23-32％。品质因数分析表明，与两个独立电厂相比，该混合电厂每年最多可发电15％（使用亚临界ORC）和19％（使用超临界ORC）。从经济上讲，使用超临界ORC的混合电站的太阳能发电成本比亚临界情景低约1.5-3.3％。

著录项

  • 来源
    《Energy Conversion & Management》 |2014年第5期|72-82|共11页
  • 作者

    Cheng Zhou;

  • 作者单位

    Priority Research Centre for Energy, Discipline of Chemical Engineering, School of Engineering, Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hybrid; Solar; Geothermal; Organic Rankine Cycle (ORC); Supercritical;

    机译：混合动力太阳能;地热;有机朗肯循环（ORC）;超临界;

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