集成引射器与机械过冷的CO_(2)冷热联供系统性能分析  

Performance Analysis of CO_(2) Systems Integrated with Ejector and Dedicated Mechanical Subcooling

作　　者：代宝民 赵瑞瑞 刘圣春[1] 钱家宝 徐田雅慧 刘晨 杨佩芳 Dai Baomin;Zhao Ruirui;Liu Shengchun;Qian Jiabao;Xu Tianyahui;Liu Chen;Yang Peifang(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin,300134,China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《制冷学报》2023年第6期69-76,109,共9页Journal of Refrigeration

基　　金：国家重点研发计划(2021YFE0116100)资助项目。

摘　　要：为提高CO_(2)系统用于建筑全年空间供热供冷的性能,本文提出集成引射器与机械过冷的跨临界CO_(2)冷热联供系统(EJ-DMS)。通过构建系统的热力学模型,以性能系数(COP)为目标函数,采用遗传算法对排气压力和过冷度进行优化,并对系统应用于5个典型城市的能耗、全年性能系数(COP_(ann))进行场景分析。结果表明:EJ-DMS相比常规机械过冷系统、常规引射系统,COP在制热和制冷模式下分别提高10.90%、5.58%和8.99%、18.12%,COP_(ann)分别提高7.95%和5.98%。EJ-DMS相比常规引射系统在制热和制冷模式下排气压力分别降低0.47 MPa和0.77 MPa。此外,EJ-DMS系统在广州和哈尔滨运行时的COP_(ann)提升率最大,表明其更适合环境温度较高或较低的地区,如夏热冬暖和严寒地区。本文可为CO_(2)冷热联供系统的构建和优化提供理论参考。A transcritical CO_(2) system combined with an ejector and dedicated mechanical subcooling(EJ-DMS)was developed to improve the performance of the CO_(2) system in the space heating and cooling of buildings throughout the year.A thermodynamic model of the system was devised.Then,the discharge pressure and subcooling degree were optimized using a genetic algorithm by considering the coefficient of performance(COP)as the objective function.Using five typical cities as application scenarios,the energy consumption and annual performance factor(COP_(ann))of the system were analyzed.The results show that,compared with a conventional mechanical subcooling system and the conventional ejector system,the heating COP of EJ-DMS is enhanced by 10.90%and 5.58%,respectively,and the cooling COP is increased by 8.99%and 18.12%,respectively.The COP_(ann) values are improved by 7.95%and 5.98%,respectively.Compared with the conventional ejector system,the discharge pressure of EJ-DMS is reduced by 0.47 MPa and 0.77 MPa in the heating and cooling modes,respectively.In addition,the COP_(ann) improvement ratio of the EJ-DMS system is the highest when operating in Guangzhou and Harbin,indicating that the EJ-DMS system is more suitable for regions with relatively high or low ambient temperatures,such as hot summer and warm winter or severely cold regions.This study provides a theoretical reference for the development and optimization of a combined cooling and heating CO_(2) system.

关 键 词：自然工质CO_(2) 冷热联供 引射器 机械过冷 COP 

分 类 号：TB611[一般工业技术—制冷工程] TK114[动力工程及工程热物理—热能工程]