Parametric analysis of organic Rankine cycle based on a radial turbine for low-grade waste heat recovery

Abstract Organic Rankine cycle (ORC) is one of the promising technologies to convert low-grade waste heat into electricity. This study comprehensively investigates the thermodynamic performance of ORC system and the aerodynamic characteristics of radial turbine. An optimized coupling model for the ORC with a radial turbine is developed, and the particle swarm optimization algorithm is applied to maximize the turbine efficiency dynamically. The model is used to evaluate the effect of heat source temperature on the cycle performance and parameter selection for turbine design optimization. The results show that optimal turbine efficiency can be achieved within the considered heat source outlet temperature range, as high pressure ratio and high mass flow rate can both degrade the turbine efficiency. Among the four studied organic fluids, the ORCs using R123 and R245fa can achieve desirable cycle performances. For the turbine design, lower degree of reaction is beneficial for turbine efficiency gains. The optimized rotational speed and ratio of wheel diameter are dependent on heat source temperature, while which has almost no effects on velocity ratio, loading coefficient, and flow coefficient. The reasonable ranges of partial turbine design parameters are also proposed in this work.

[1]  Lisa Branchini,et al.  Systematic comparison of ORC configurations by means of comprehensive performance indexes , 2013 .

[2]  Sylvain Quoilin,et al.  Sustainable energy conversion through the use of Organic Rankine Cycles for waste heat recovery and solar applications , 2011 .

[3]  Steven Lecompte,et al.  Methodical thermodynamic analysis and regression models of organic Rankine cycle architectures for waste heat recovery , 2015 .

[4]  S. Kim,et al.  Power-based performance comparison between carbon dioxide and R125 transcritical cycles for a low-grade heat source , 2011 .

[5]  Yan Li,et al.  Investigation of the organic Rankine cycle (ORC) system and the radial-inflow turbine design , 2016 .

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

[7]  Riccardo Poli,et al.  Particle swarm optimization , 1995, Swarm Intelligence.

[8]  Che Lin-xian.  Synthesis of planar Stephenson III typed 6-bar function generative mechanism , 2005 .

[9]  Russell C. Eberhart,et al.  Parameter Selection in Particle Swarm Optimization , 1998, Evolutionary Programming.

[10]  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 .

[11]  Daniele Fiaschi,et al.  Design of micro radial turboexpanders for ORC power cycles: From 0D to 3D , 2016 .

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

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

[14]  Daniele Fiaschi,et al.  Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles , 2012 .

[15]  Jialing Zhu,et al.  Cascade utilization of low temperature geothermal water in oilfield combined power generation, gathering heat tracing and oil recovery , 2012 .

[16]  Johann Fischer,et al.  Comparison of trilateral cycles and organic Rankine cycles , 2011 .

[17]  Christos N. Markides,et al.  Thermo-Economic and Heat Transfer Optimization of Working-Fluid Mixtures in a Low-Temperature Organic Rankine Cycle System † , 2016 .

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

[19]  Raya Al-Dadah,et al.  Modelling and optimization of organic Rankine cycle based on a small-scale radial inflow turbine , 2015 .

[20]  Shuang-Ying Wu,et al.  A new selection principle of working fluids for subcritical organic Rankine cycle coupling with different heat sources , 2014 .

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

[22]  Emilie Sauret,et al.  Three-dimensional off-design numerical analysis of an organic Rankine cycle radial-inflow turbine , 2014 .

[23]  Ralph Greif,et al.  Comparison of the Organic Flash Cycle (OFC) to other advanced vapor cycles for intermediate and high temperature waste heat reclamation and solar thermal energy , 2012 .

[24]  A. J. Glassman,et al.  Computer program for design analysis of radial-inflow turbines , 1976 .

[25]  V. Dolz,et al.  Model of the expansion process for R245fa in an Organic Rankine Cycle (ORC) , 2012 .

[26]  Daniele Fiaschi,et al.  Design and performance prediction of radial ORC turboexpanders , 2015 .

[27]  Lisheng Pan,et al.  Improved analysis of Organic Rankine Cycle based on radial flow turbine , 2013 .

[28]  Chun-wei Gu,et al.  Influence of the radial-inflow turbine efficiency prediction on the design and analysis of the Organic Rankine Cycle (ORC) system , 2016 .

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

[30]  Christos N. Markides,et al.  Supersonic flow of non-ideal fluids in nozzles: An application of similitude theory and lessons for ORC turbine design and flexible use considering system performance , 2017 .

[31]  Bensi Dong,et al.  Analysis of the supercritical organic Rankine cycle and the radial turbine design for high temperature applications , 2017 .

[32]  Alberto Mirandola,et al.  The ORC-PD: A versatile tool for fluid selection and Organic Rankine Cycle unit design , 2016 .