Performance analysis and optimization of a combined cooling and power system using low boiling point working fluid driven by engine waste heat

作     者：Huang, Wenge Wang, Jiangfeng Xia, Jiaxi Zhao, Pan Dai, Yiping 

作者机构：Xi An Jiao Tong Univ Sch Energy & Power Engn Inst TurbomachineryState Key Lab Multiphase Flow Shaanxi Engn Lab Turbomachinery & Power Equipment Xian 710049 Shaanxi Peoples R China 

出 版 物：《ENERGY CONVERSION AND MANAGEMENT》 (能量转换与管理)

年 卷 期：2019年第180卷

页      面：962-976页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China 

主　　题：Internal combustion engine Brayton cycle Waste heat recovery Dual-pressure organic Rankine cycle Ejector refrigeration cycle Optimization 

摘      要：This paper develops a combined cooling and power system, which consists of a carbon dioxide Brayton cycle, a dual-pressure organic Rankine cycle and an ejector refrigeration cycle, to recover waste heat from exhaust gas and jacket water in internal combustion engines. Thermodynamic models of the system are performed and exergoeconomic methods are used to calculate the levelized exergy cost of the component products. Effects of seven parameters, including Brayton cycle turbine inlet temperature and inlet pressure, organic Rankine cycle turbine high-pressure side and low-pressure side inlet temperature and ejector primary inlet pressure, are evaluated. Single-objective optimization is carried out by means of genetic algorithm to obtain the minimum levelized exergy cost of system product. Results show that the increase of pressure at Brayton cycle turbine inlet and high-pressure and low-pressure side of the organic Rankine cycle turbine inlet contributes to the decrease of levelized exergy cost of the system product. Optimization results show that minimum levelized exergy cost for system product is 53.25 $ (MWh)(-1). When system product levelized exergy cost is minimum, system net power output, cooling capacity and exergy efficiency are 374.37 kW, 188.63 kW and 37.31%, respectively.