梯形循环及模拟有机朗肯循环的理论研究  

TRAPEZOIDAL CYCLE AND THEORETICAL STUDY OF SIMULATING ORGANIC RANKINE CYCLE

作　　者：李新国[1] 翟哲[1] Li Xinguo, Zhai Zhe(School of Mechanical Engineering, Tianjin University, Tianjin 300350, China)

机构地区：[1]天津大学机械工程学院

出　　处：《太阳能学报》2018年第10期2737-2744,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51276122)

摘　　要：基于有机朗肯循环，提出梯形循环及其理论模型，分析梯形循环与有机朗肯循环之间的偏差。分析表明：当蒸发温度低于临界温度5℃时，梯形循环与有机朗肯循环的偏差小于5％；优化工况下的蒸发温度、最大净输出功及其热效率的相对偏差分别小于2．62％、2．42％、6．21％。基于前期研究提出的优化工况下蒸发温度、最大净输出功和热效率的经验公式进行偏差与应用范围的分析，得到经验公式与有机朗肯循环（及梯形循环）之间的相对偏差分别为优化蒸发温度小于3．26％（1．42％）、最大净输出功小于3．14％（2．46％）和热效率小于5．53％（3．06％）。梯形循环与经验公式可不受具体工质与循环构型的限制，开展有机朗肯循环的拓展性研究，研究有机朗肯循环（或梯形循环）的一般性热力学规律。Trapezoidal cycle （TPC） and its theoretical model are proposed based on organic Rankine cycle （ORC）. The deviation between TPC and ORC is analyzed. The analyses show that when evaporation temperature is 5℃ lower than the critical temperature of the working fluid, the deviation between TPC and ORC is lower than 5%. The relative deviations of evaporation temperature, maximum net output work and thermal efficiency under the optimized working condition are lower than 2.62% , 2.42% and 6.21% , respectively. Based on the empirical equations of evaporation temperature, maximum net output work and thermal efficiency under the optimized working conditions presented by previous work, the analyses of deviation and application range were carried out to get the relative deviations of the optimal evaporation temperature, maximum net output work and thermal efficiency between the empirical equations and ORC （and TPC） are lower than 3.26% （1.42%）, 3.14% （2.46%） and 5.53% （3.06%） , respectively. The trapezoidal cycle and empirical equations can break through the restrictions of actual working fluids and the configuration of the cycle, perform extended research of the ORC and investigate the general thermodynamics principles of the ORC （or TPC）.

关 键 词：有机朗肯循环 梯形循环 经验公式 偏差分析 

分 类 号：TK123[动力工程及工程热物理—工程热物理]