Simulation of CO_2 Brayton Cycle for Engine Exhaust Heat Recovery under Various Operating Loads  

作　　者：舒歌群 张承宇 田华 高媛媛 李团兵 仇荣赓 

机构地区：[1]State Key Laboratory of Engines, Tianjin University

出　　处：《Transactions of Tianjin University》2015年第3期193-198,共6页天津大学学报（英文版）

基　　金：Supported by the National Basic Research Program of China("973"Program,No.2011CB707201);the National Natural Science Foundation of China(No.51206117)

摘　　要：A bottoming cycle system based on CO2 Brayton cycle is proposed to recover the engine exhaust heat. Its performance is compared with the conventional air Brayton cycle under five typical engine conditions. The results show that CO2 Brayton cycle proves to be superior to the air Brayton cycle in terms of the system net output power, thermal efficiency and recovery efficiency. In most cases, the recovery efficiency of CO2 Brayton cycle can be higher than 9% and the system has a better performance at the engine＇s high operating load, The thermal efficiency can be as large as 24.83% under 100% olaerating load, accordingly, the net outnut nower of 14.86 kW in nhtninedA bottoming cycle system based on CO2 Brayton cycle is proposed to recover the engine exhaust heat. Its performance is compared with the conventional air Brayton cycle under five typical engine conditions. The results show that CO2 Brayton cycle proves to be superior to the air Brayton cycle in terms of the system net output power, thermal efficiency and recovery efficiency. In most cases, the recovery efficiency of CO2 Brayton cycle can be higher than 9% and the system has a better performance at the engine's high operating load. The thermal efficiency can be as large as 24.83% under 100% operating load, accordingly, the net output power of 14.86 kW is obtained.

关 键 词：CO2 Brayton cycle waste heat recovery 

分 类 号：X773[环境科学与工程—环境工程]