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针对中低温太阳能热源,采用低沸点的有机工质作为动力循环进行发电.在满足环保、安全及热物性的要求下,采用15种有机工质作为循环工质,根据热力学第一、第二定律,建立亚临界热力系统数学模型,采用窄点温差分析法,分别从热效率、209482效率、膨胀比、环境209482代价等角度对比分析其循环特性.考虑多方面因素,利用层次分析法构建多指标能效综合评价模型.经过模拟计算,结果表明:甲苯(toluene)作为本系统循环工质的性能较优.“,”Aimed at the medium-low temperature solar energy heat source,low boiling point organic working fluid was used as the power cycle for power generation.On the premise of meeting the requirements of environmental protection, safety and thermal property,15 kinds of organic fluids were used as cycle working medium and the mathematical model of subcritical thermal system was established based on the first and second laws of thermodynamics. The pinch temperature difference analysis method was used to analyze and compare the cycle characteristics from the multi-angles including thermal efficiency,exergy efficiency,expansion ratio,environmental exergy cost and so on. Considering various factors,the multi-index comprehensive evaluation model of energy efficiency was constructed by using analytic hierarchy process method. The simulation calculation results showed that toluene as the cycle working medium has a better performance.