Thermodynamic selection criteria of zeotropic mixtures for subcritical organic Rankine cycle

Although using zeotropic mixtures in the organic Rankine cycle (ORC) system can improve its performance, the selection of the mixture working fluid is still a great challenge due to the lack of selection criteria. In the present work, the thermodynamic selection criteria of zeotropic mixtures is proposed based on the exergy analysis of the subcritical ORC. The mixture composition can be directly determined according to the thermophysical properties of working fluids without massive thermodynamic calculation. The effect of temperature match between the working fluids and the heat source/sink on the system performance is analyzed. And the overall exergy efficiency is set as the optimization index. For the heat source without limit to the outlet temperature, the improvement of the temperature match in the evaporator exhibits more significant influence on the cycle performance than that in the condenser. Thus, the match condition with the heat source shoud be firstly satified when selecting working fluids. The proper temperature glide in the condenser can further improve the cycle performance. The ‘wet’ mixtures have relatively lower cycle performance compare to ‘dry’ and ‘isentropic’ ones. The steps of using this selection criteria and a case study to validate it are also illustrated.

[1]  Ruixiang Zhang,et al.  A simultaneous approach to optimize the component and composition of zeotropic mixture for power generation systems , 2018, Energy Conversion and Management.

[2]  Chao Liu,et al.  The Optimal Evaporation Temperature of Subcritical ORC Based on Second Law Efficiency for Waste Heat Recovery , 2012, Entropy.

[3]  Kim Sørensen,et al.  Guidelines for optimal selection of working fluid for an organic Rankine cycle in relation to waste heat recovery , 2016 .

[4]  Jie Zhang,et al.  Analysis of organic Rankine cycles using zeotropic mixtures as working fluids under different restrictive conditions , 2016 .

[5]  Lin Shi,et al.  Analysis of the quantitative correlation between the heat source temperature and the critical temperature of the optimal pure working fluid for subcritical organic Rankine cycles , 2016 .

[6]  Jinliang Xu,et al.  Experimental and modeling investigation of an organic Rankine cycle system based on the scroll expander , 2017 .

[7]  Chao Liu,et al.  Potential of organic Rankine cycle using zeotropic mixtures as working fluids for waste heat recovery , 2014 .

[8]  Jinliang Xu,et al.  Critical temperature criterion for selection of working fluids for subcritical pressure Organic Rankine cycles , 2014 .

[9]  Markus Preißinger,et al.  Low grade waste heat recovery with subcritical and supercritical Organic Rankine Cycle based on natural refrigerants and their binary mixtures , 2015 .

[10]  Markus Preißinger,et al.  Zeotropic mixtures as working fluids in Organic Rankine Cycles for low-enthalpy geothermal resources , 2012 .

[11]  Xiao Feng,et al.  A new pinch based method for simultaneous selection of working fluid and operating conditions in an ORC (Organic Rankine Cycle) recovering waste heat , 2015 .

[12]  Dieter Brüggemann,et al.  Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures , 2015 .

[13]  Kyung Chun Kim,et al.  Investigation of organic Rankine cycles with zeotropic mixtures as a working fluid: Advantages and issues , 2017 .

[14]  Rodolfo Taccani,et al.  Energy efficiency analysis of Organic Rankine Cycles with scroll expanders for cogenerative applications , 2012 .

[15]  Steven Lecompte,et al.  Exergy analysis of zeotropic mixtures as working fluids in organic rankine cycles , 2014 .

[16]  Yuwen Zhang,et al.  Economical evaluation and optimization of organic Rankine cycle with mixture working fluids using R245fa as flame retardant , 2017 .

[17]  Rui Long,et al.  Exergy analysis and working fluid selection of organic Rankine cycle for low grade waste heat recovery , 2014 .

[18]  Ibrahim Dincer,et al.  Comparative performance analysis of low-temperature Organic Rankine Cycle (ORC) using pure and zeotropic working fluids , 2013 .

[19]  Christian Vetter,et al.  Comparison of sub- and supercritical Organic Rankine Cycles for power generation from low-temperature/low-enthalpy geothermal wells, considering specific net power output and efficiency , 2013 .

[20]  Jinliang Xu,et al.  Development and dynamic characteristics of an Organic Rankine Cycle , 2014 .

[21]  Eric W. Lemmon,et al.  Equations of State for Mixtures of R-32, R-125, R-134a, R-143a, and R-152a , 2004 .

[22]  Isam H. Aljundi,et al.  Effect of dry hydrocarbons and critical point temperature on the efficiencies of organic Rankine cycle , 2011 .

[23]  Jinliang Xu,et al.  A new design method for Organic Rankine Cycles with constraint of inlet and outlet heat carrier fluid temperatures coupling with the heat source , 2012 .

[24]  Andrea Lazzaretto,et al.  A general framework to select working fluid and configuration of ORCs for low-to-medium temperature heat sources , 2015 .

[25]  S. K. Wang,et al.  A Review of Organic Rankine Cycles (ORCs) for the Recovery of Low-grade Waste Heat , 1997 .

[26]  Jian Song,et al.  Analysis of ORC (Organic Rankine Cycle) systems with pure hydrocarbons and mixtures of hydrocarbon and retardant for engine waste heat recovery , 2015 .

[27]  Li Zhao,et al.  Thermodynamic analysis of organic Rankine cycle using zeotropic mixtures , 2014 .

[28]  Patrick Linke,et al.  Selection of working fluid mixtures for flexible Organic Rankine Cycles under operating variability through a systematic nonlinear sensitivity analysis approach , 2015 .

[29]  Gequn Shu,et al.  Study of mixtures based on hydrocarbons used in ORC (Organic Rankine Cycle) for engine waste heat recovery , 2014 .

[30]  Tzu-Chen Hung,et al.  Thermoeconomic comparison between pure and mixture working fluids of organic Rankine cycles (ORCs) for low temperature waste heat recovery , 2015 .

[31]  Vincent Lemort,et al.  Systematic optimization of subcritical and transcritical organic Rankine cycles (ORCs) constrained by technical parameters in multiple applications , 2014 .

[32]  Zhen Yang,et al.  Effect of condensation temperature glide on the performance of organic Rankine cycles with zeotropic mixture working fluids , 2014 .

[33]  Jinliang Xu,et al.  Operation and performance of a low temperature organic Rankine cycle , 2015 .

[34]  Jinliang Xu,et al.  The optimal evaporation temperature and working fluids for subcritical organic Rankine cycle , 2012 .

[35]  Yuandan Wu,et al.  Thermal and economic performance analysis of zeotropic mixtures for Organic Rankine Cycles , 2016 .

[36]  T. Hung.  Waste heat recovery of organic Rankine cycle using dry fluids , 2001 .

[37]  Dongxiang Wang,et al.  Efficiency and optimal performance evaluation of organic Rankine cycle for low grade waste heat power generation , 2013 .

[38]  Victor M. Zavala,et al.  A stochastic optimization approach for the design of organic fluid mixtures for low-temperature heat recovery , 2017 .

[39]  Li Zhao,et al.  A review of working fluid and expander selections for organic Rankine cycle , 2013 .

[40]  Assaad Zoughaib,et al.  ORC optimization for medium grade heat recovery , 2014 .

[41]  Fredrik Haglind,et al.  Selection and optimization of pure and mixed working fluids for low grade heat utilization using organic Rankine cycles , 2014 .

[42]  Qingsong An,et al.  Zeotropic mixture active design method for organic Rankine cycle , 2018 .

[43]  M. McLinden,et al.  NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 8.0 , 2007 .

[44]  Guoqiang Xu,et al.  Analysis of zeotropic mixtures used in high-temperature Organic Rankine cycle , 2014 .

[45]  S. Deng,et al.  New knowledge on the temperature-entropy saturation boundary slope of working fluids , 2017 .

[46]  Jovana Radulovic,et al.  On the potential of zeotropic mixtures in supercritical ORC powered by geothermal energy source , 2014 .

[47]  Ronald DiPippo,et al.  Second Law assessment of binary plants generating power from low-temperature geothermal fluids , 2004 .

[48]  Pedro J. Mago,et al.  An examination of regenerative organic Rankine cycles using dry fluids , 2008 .

[49]  Fredrik Haglind,et al.  A review of recent research on the use of zeotropic mixtures in power generation systems , 2017 .

[50]  P. Mago.  Exergetic Evaluation of an Organic Rankine Cycle Using Medium-Grade Waste Heat , 2012 .

[51]  Jialing Zhu,et al.  Parametric optimization and performance analysis of zeotropic mixtures for an organic Rankine cycle driven by low-medium temperature geothermal fluids , 2015 .

[52]  Yuandan Wu,et al.  Performance analysis of zeotropic mixtures for the dual-loop system combined with internal combustion engine , 2016 .

[53]  K. Satanphol,et al.  A study on optimal composition of zeotropic working fluid in an Organic Rankine Cycle (ORC) for low grade heat recovery , 2017 .

[54]  Bruno Vanslambrouck,et al.  Potential of zeotropic mixtures as working fluids in organic Rankine cycles , 2012 .