A Theoretical Criterion for Evaluating the Thermodynamic Effectiveness of Regenerators in Organic Rankine Cycle Systems  

作　　者：LEI Biao ZHANG Cancan ZHANG Yeqiang WU Yuting WANG Wei MA Chongfang 

机构地区：[1]MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China [2]School of Energy and Power Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China

出　　处：《Journal of Thermal Science》2021年第6期2027-2036,共10页热科学学报（英文版）

基　　金：supported by Beijing Municipal Natural Science Foundation(NO.3202006).

摘　　要：Organic Rankine Cycle(ORC)is a promising technology for converting low or medium temperature heat into power.In order to improve the thermodynamic efficiency of ORC systems,adding a regenerator to the system has been widely discussed.However,this needs additional pipes and devices and they will produce additional pressure drop.Considering both the contributions of the regenerator and the power losses caused by additional pressure drop,a theoretical criterion for evaluating the thermodynamic effectiveness of adding a regenerator was proposed by means of mathematic and thermodynamic equations.The core of the criterion is a new concept named Critical Pressure Drop produced by the Regenerator(CPDR).A negative value of CPDR indicates that adding a regenerator will not contribute to the thermodynamic efficiency of ORC systems in any case.An effective regenerator needs a positive value of CPDR,and requires that the value of additional pressure drop produced by introducing the regenerator should be smaller than CPDR.The influences of evaporation temperature,condensation temperature,expander efficiency,regenerator effectiveness and working fluids on CPDR were also examined.It was found that lower evaporation temperature or using working fluids with higher critical temperature tends to reduce the value of CPDR.

关 键 词：Organic Rankine Cycle REGENERATOR additional pressure drops 

分 类 号：TM619[电气工程—电力系统及自动化] TK115[动力工程及工程热物理—热能工程]