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Exergoeconomic and exergoenvironmental analysis of a combined heating and power system driven by geothermal source
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.enconman.2020.112765
Wenge Huang , Jiangfeng Wang , Zhijian Lu , Sheng Wang

Abstract This paper develops a geothermal driven combined heating and power system to obtain multi-generation, in which power is generated by Organic Rankine Cycle and heating is supplied by radiant floor heating system. Comprehensive thermodynamic, exergoeconomic and exergoenvironmental models of the system are performed and the capital cost and environmental impacts of the system components are analyzed. Superheat degree of the organic working fluid and inlet pressure of the Organic Rankine Cycle turbine are selected as variables to assess the system performance. Multi-objective optimization is employed to obtain the maximum system net power output, minimum levelized cost per exergy unit and minimum levelized environmental impact per exergy unit of the system. Results show that the increase of the working fluid superheat degree and the Organic Rankine Cycle turbine inlet pressure would cause the decrease of the Organic Rankine Cycle turbine power output and the increase of the heat supplying. Cooling water holds the highest levelized exergy cost and geothermal water heat exchanger has the highest environmental impact reducing potential. Under the condition of 11 °C superheat degree and 833 kPa Organic Rankine Cycle turbine inlet pressure, the system obtains a better performance with system net power output 1.19 MW, levelized cost per exergy unit 4.80 $/GJ and environmental impact per exergy unit 16.0 mpts/GJ.

中文翻译:

地热源驱动的热电联产系统的热能经济和热能环境分析

摘要 本文开发了一种地热驱动的热电联产系统以实现多发电,其中电力由有机朗肯循环产生,采暖由地板辐射供暖系统提供。执行系统的综合热力学、热力学和热力学环境模型,并分析系统组件的资本成本和环境影响。选择有机工质的过热度和有机朗肯循环涡轮机的入口压力作为评价系统性能的变量。采用多目标优化来获得系统的最大系统净功率输出、最小每单位火用能成本和最小系统每单位火用能平均环境影响。结果表明,工质过热度和有机朗肯循环汽轮机进口压力的增加会导致有机朗肯循环汽轮机输出功率的降低和供热量的增加。冷却水的平均火用成本最高,地热水热交换器具有最大的减少环境影响的潜力。在11°C过热度和833 kPa有机朗肯循环涡轮进口压力条件下,系统获得了更好的性能,系统净输出功率为1.19 MW,每单位平准化成本4.80 $/GJ,每单位环境影响16.0 mpts /GJ。冷却水的平均火用成本最高,地热水热交换器具有最大的减少环境影响的潜力。在11°C过热度和833 kPa有机朗肯循环涡轮进口压力条件下,系统获得了更好的性能,系统净输出功率为1.19 MW,每单位平准化成本4.80 $/GJ,每单位环境影响16.0 mpts /GJ。冷却水的平均火用成本最高,地热水热交换器具有最大的减少环境影响的潜力。在11°C过热度和833 kPa有机朗肯循环涡轮进口压力条件下,系统获得了更好的性能,系统净输出功率为1.19 MW,每单位平准化成本4.80 $/GJ,每单位环境影响16.0 mpts /GJ。
更新日期:2020-05-01
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