Energy and exergy analyses of a bottoming Rankine cycle for engine exhaust heat recovery

In this paper, a theoretical study on the thermodynamic processes of a bottoming Rankine cycle for engine waste heat recovery is conducted from the viewpoints of energy balance and exergy balance. A theoretical formula and an exergy distribution map for qualitative analyses of the main operating parameters are presented under simplified conditions when exhaust gas is selected as the only heat source. Five typical working fluids, which are always selected by manufacturers for different types of engines, are compared under various operating conditions in Matlab software. The results show that working fluid properties, evaporating pressure and superheating temperature are the main factors influencing the system design and performances. The global recovery efficiency does not exceed 0.14 under typical operating conditions. Ethanol and R113 show better thermodynamic performances in the whole exhaust gas temperature range. In addition, the optimal evaporating pressure usually does not exist in engine exhaust heat recovery, and the distributions of exergy destruction are varied with working fluid categories and system design constraints.

[1]  Dimitrios C. Kyritsis,et al.  Comparative second-law analysis of internal combustion engine operation for methane, methanol, and dodecane fuels , 2001 .

[2]  Christos Katsanos,et al.  Thermodynamic analysis of a Rankine cycle applied on a diesel truck engine using steam and organic medium , 2012 .

[3]  Ricardo Novella,et al.  HD Diesel engine equipped with a bottoming Rankine cycle as a waste heat recovery system. Part 2: Evaluation of alternative solutions , 2012 .

[4]  Dimitrios C. Kyritsis,et al.  Availability analysis of hydrogen/natural gas blends combustion in internal combustion engines , 2008 .

[5]  T. Shedd,et al.  Theoretical Analysis of Waste Heat Recovery from an Internal Combustion Engine in a Hybrid Vehicle , 2006 .

[6]  Robert M. Wagner,et al.  A Waste Heat Recovery System for Light Duty Diesel Engines , 2010 .

[7]  C. N. Michos,et al.  Availability analysis of a syngas fueled spark ignition engine using a multi-zone combustion model , 2008 .

[8]  Takahashi Kazuya,et al.  Study on Maximizing Exergy in Automotive Engines , 2007 .

[9]  Minggao Ouyang,et al.  Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery , 2011 .

[10]  Sven B Andersson,et al.  Comparison of Working Fluids in Both Subcritical and Supercritical Rankine Cycles for Waste-Heat Recovery Systems in Heavy-Duty Vehicles , 2012 .

[11]  Michael J. Moran,et al.  Availability analysis: A guide to efficient energy use , 1982 .

[12]  Gequn Shu,et al.  Fluids and parameters optimization for the organic Rankine cycles (ORCs) used in exhaust heat recovery of Internal Combustion Engine (ICE) , 2012 .

[13]  E. Stefanakos,et al.  A REVIEW OF THERMODYNAMIC CYCLES AND WORKING FLUIDS FOR THE CONVERSION OF LOW-GRADE HEAT , 2010 .

[14]  Evangelos G. Giakoumis,et al.  Second-law analyses applied to internal combustion engines operation , 2006 .

[15]  K. Srinivasan,et al.  Analysis of exhaust waste heat recovery from a dual fuel low temperature combustion engine using an Organic Rankine Cycle , 2010 .

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

[17]  Gequn Shu,et al.  Simulation and thermodynamic analysis of a bottoming Organic Rankine Cycle (ORC) of diesel engine (DE) , 2013 .

[18]  J. Ringler,et al.  Rankine Cycle for Waste Heat Recovery of IC Engines , 2009 .

[19]  Denis Clodic,et al.  Combined Cycle for Hybrid Vehicles , 2005 .

[20]  You-Rong Li,et al.  Influence of coupled pinch point temperature difference and evaporation temperature on performance of organic Rankine cycle , 2012 .

[21]  Rahman Saidur,et al.  Technologies to recover exhaust heat from internal combustion engines , 2012 .

[22]  Agostino Gambarotta,et al.  Internal Combustion Engine (ICE) bottoming with Organic Rankine Cycles (ORCs) , 2010 .

[23]  Maogang He,et al.  Exhaust Recovery of Vehicle Gasoline Engine Based on Organic Rankine Cycle , 2011 .

[24]  Mário Costa,et al.  Analysis of vehicle exhaust waste heat recovery potential using a Rankine cycle , 2013 .

[25]  Gerhard Regner,et al.  Waste Heat Recovery of Heavy-Duty Diesel Engines by Organic Rankine Cycle Part II: Working Fluids for WHR-ORC , 2007 .

[26]  Ho Teng,et al.  Waste Heat Recovery Concept to Reduce Fuel Consumption and Heat Rejection from a Diesel Engine , 2010 .

[27]  Gequn Shu,et al.  Parametric and exergetic analysis of waste heat recovery system based on thermoelectric generator and organic rankine cycle utilizing R123 , 2012 .

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

[29]  Yiping Dai,et al.  Thermodynamic analysis and optimization of an (organic Rankine cycle) ORC using low grade heat source , 2013 .

[30]  Ho Teng,et al.  A Rankine Cycle System for Recovering Waste Heat from HD Diesel Engines - Experimental Results , 2011 .

[31]  Gequn Shu,et al.  A review of researches on thermal exhaust heat recovery with Rankine cycle , 2011 .