Simulations of a Bottoming Organic Rankine Cycle (ORC) Driven by Waste Heat in a Diesel Engine (DE)

A bottoming waste-heat-recovery (WHR) model based on the Organic Rankine Cycle (ORC) is proposed to recover waste heat from exhaust gas and jacket water of a typical diesel engine (DE). The ORC model is detailed built based upon real structural and functional parameters of each component, and is able to precisely reflect the working process of the experimental ORC system constructed in lab. The DE is firstly tested to reveal its energy balance and the features of waste heat. The bottoming ORC is then simulated based on experimental data from the DE bench test using R245fa and R601a as working fluid. Thermodynamic evaluations are done on key parameters like waste heat recovered, expansion power, pump power loss and system efficiency. Results indicate that maximum expansion power and efficiency of the ORC are up to 18.8kW and 9.6%. Influences of engine condition, fluid mass flow and evaporating pressure on system performance are analyzed and meaningful regularities are revealed. The combined system of DE and bottoming ORC (DE-ORC) is also investigated. The results showed that the integration of the bottoming ORC greatly changed energy distribution of the DE, and the DE thermal efficiency is up to 47.2%, increasing by 9.0%.

[1]  Noboru Yamada,et al.  Efficiency of hydrogen internal combustion engine combined with open steam Rankine cycle recovering water and waste heat , 2010 .

[2]  Gerhard Regner,et al.  Waste Heat Recovery of Heavy-Duty Diesel Engines by Organic Rankine Cycle Part I: Hybrid Energy System of Diesel and Rankine Engines , 2007 .

[3]  Richard Stobart,et al.  Heat Recovery and Bottoming Cycles for SI and CI Engines - A Perspective , 2006 .

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

[5]  K. C. Midkiff,et al.  Improving the Efficiency of the Advanced Injection Low Pilot Ignited Natural Gas Engine Using Organic Rankine Cycles , 2008 .

[6]  Richard Stobart,et al.  Thermal efficiency improvement in high output diesel engines a comparison of a Rankine cycle with turbo-compounding , 2010 .

[7]  Gerhard Regner,et al.  Achieving High Engine Efficiency for Heavy-Duty Diesel Engines by Waste Heat Recovery Using Supercritical Organic-Fluid Rankine Cycle , 2006 .

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

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

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

[11]  Guo Tao,et al.  Performance comparison and parametric optimization of subcritical Organic Rankine Cycle (ORC) and transcritical power cycle system for low-temperature geothermal power generation , 2011 .

[12]  Farid Chejne,et al.  A technical, economical and market review of organic Rankine cycles for the conversion of low-grade heat for power generation , 2012 .

[13]  Christos Katsanos,et al.  Potentiality for Optimizing Operational Performance and Thermal Management of Diesel Truck Engine Rankine Cycle by Recovering Heat in EGR Cooler , 2010 .

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

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

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

[17]  Li Jing,et al.  Optimization of low temperature solar thermal electric generation with Organic Rankine Cycle in different areas , 2010 .

[18]  Li Zhao,et al.  An experimental study on the recuperative low temperature solar Rankine cycle using R245fa , 2012 .