CFD-Based Optimization of a Diesel Engine Waste Heat Recycle System  

作　　者：Da Li Guodong Zhang Ke Sun Shuzhan Bai Guoxiang Li 

机构地区：[1]School of Energy and Power Engineering,Shandong University,Jinan,250061,China

出　　处：《Fluid Dynamics & Materials Processing》2023年第6期1479-1493,共15页流体力学与材料加工（英文）

基　　金：funded by National Engineering Laboratory for Mobile Source Emission Control Technology of China[Grant No.NELMS2019A01];the Undergraduate School of Shandong University,China[Grant No.2022Y155].

摘　　要：A dedicated heat exchanger model is introduced for the optimization of heavy-duty diesel engines.The model is a prerequisite for the execution of CFD simulations,which are used to improve waste heat recovery in these systems.Several optimization methods coupled with different types of working fluids are compared in terms of exergy efficiency and heat exchanger complicity.The three considered optimization methods all lead to significant improvements in the R245fa and R1233zd systems with a comparatively low evaporation temperature.The optimal R245fa system has the highest efficiency increase(77.49%).The cyclopentane system displays the highest efficiency among the optimized ORC(Organic Rankine Cycle)systems,yet achieved by using a much heavier evaporator HEC(Heat Exchanging Core).In contrast,the 96.84%efficiency increase for the optimized R1233zd is achieved with only 68.96%evaporator weight.

关 键 词：Tube-fin heat exchanger heat exchanging core organic rankine cycle working fluid 

分 类 号：TK426[动力工程及工程热物理—动力机械及工程]