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首页> 外文期刊>International journal of green energy >Exergy and economic analysis of organic Rankine cycle hybrid system utilizing biogas and solar energy in rural area of China
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Exergy and economic analysis of organic Rankine cycle hybrid system utilizing biogas and solar energy in rural area of China

机译：中国农村沼气与太阳能有机朗肯循环混合动力系统的火用经济分析

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Due to the existing huge biogas resource in the rural area of China, biogas is widely used for production and living. Cogeneration system provides an opportunity to realize the balanced utilization of the renewable energy such as biogas and solar energy. This article presented a numerical investigation of a hybrid energy-driven organic Rankine cycle (ORC) cogeneration system, involving a solar ORC and a biogas boiler. The biogas boiler with a module of solar parabolic trough collectors (PTCs) is employed to provide heat source to the ORC via two distinct intermediate pressurized circuits. The cogeneration supplied the power to the air-condition in summer condition and hot water, which is heated in the condenser, in winter condition. The system performance under the subcritical pressures has been assessed according to the energy-exergy and economic analysis with the organic working fluid R123. The effects of various parameters such as the evaporation and condensation temperatures on system performance were investigated. The net power generation efficiency of the cogeneration system is 11.17%, which is 25.8% higher than that of the base system at an evaporation temperature 110 degrees C. The exergy efficiency of ORC system increases from 35.2% to 38.2%. Moreover, an economic analysis of the system is carried out. The results demonstrate that the profits generated from the reduction of biogas fuel and electricity consumption can lead to a significant saving, resulting in an approximate annual saving from $1,700 to $3,000. Finally, a case study based on the consideration of typical rural residence was performed, which needs a payback period of 7.8years under the best case.
机译：由于中国农村地区现有巨大的沼气资源，沼气被广泛用于生产和生活。热电联产系统为实现沼气和太阳能等可再生能源的平衡利用提供了机会。本文介绍了一个混合能源驱动的有机朗肯循环（ORC）热电联产系统的数值研究，该系统涉及一个太阳能ORC和一个沼气锅炉。具有太阳能抛物线槽收集器（PTC）模块的沼气锅炉用于通过两个不同的中间加压回路向ORC提供热源。在夏季，热电联产为空调供电；在冬季，热电联供为冷凝器加热的热水。在亚临界压力下的系统性能已经根据使用有机工作液R123进行的能量和经济分析进行了评估。研究了蒸发和冷凝温度等各种参数对系统性能的影响。热电联产系统的净发电效率为11.17％，在蒸发温度为110摄氏度时比基本系统高25.8％。ORC系统的（火用）效率从35.2％提高到38.2％。此外，对该系统进行了经济分析。结果表明，减少沼气燃料和电力消耗所产生的利润可以节省大量资金，每年大约可节省1,700美元至3,000美元。最后，基于典型农村居民的考虑进行了案例研究，在最佳情况下，投资回收期需要7.8年。

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