Optimization Of Efficiency Of Waste Heat Recovery Of IC Engines Based On Multiple Cycles

There’s no doubt that energy play an important role in China’s future strategicdevelopment, and our industry and economic developments dependent on importedenergy heavily, particularly oil, because of our large population and energy crisis.Therefore, energy-saving technology should be developed. This paper hopes that wecan improve the IC engines’ thermal efficiency by10%, basing on the traditional ICengine technology. It means that we can get30million tons of oil savings and70million CO₂emissions reduction, with considerable economic and environmentalbenefits.In this paper, the analysis and comparison of the potential technologies to recoverwaste heat from engines have been made and a novel system considering organicrankine cycle （ORC） and thermoelectric generator （TEG） is established based on adiesel engine. Thermodynamic models of TEG and ORC are investigated in latersections, and the properties of exhaust gases have been also simulated. Furthermore,TEG-ORC system is investigated and parameters including working pressures, TEGconfiguration and performance of expanders are discussed in this paper. And we tryour best make it clear how they affect WHR system performances and efficiency.Analysis of the system indicates that efficiency of expanders determines theperformance of the overall system. We design the turbine expander preliminary anddo some work on performance prediction by using ANSYS CFX. CFD calculation hasbeen made for the nozzle and rotor blades of turbine expander.In conclusion, thermodynamic model of TEG-ORC system is established in this paperand the performance prediction on this combined system has been made. For furtherwork, test bench is under built and experimental data would be supplied for furtherstudy. Therefore, recovery and conversion engine exhaust energy based on Rankinecycle is an effective means to save energy and reduce fuel consumption and CO₂emissions of automotive.