中间压力对商超CO_(2)增压制冷系统性能的影响  

Effect of intermediate pressure on the performance of CO_(2) booster refrigeration system in supermarkets

作　　者：江嘉玮 殷太岚 郑泽烨 杨启超 Jiang Jiawei;Yin Tailan;Zheng Zeye;Yang Qichao(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266000,China)

机构地区：[1]青岛科技大学机电工程学院,青岛266000

出　　处：《低温与超导》2024年第10期61-69,共9页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51976095)资助。

摘　　要：针对商超用跨临界CO_(2)基本增压(BRC)和并行压缩(PRC)制冷系统,建立系统分析的热力学模型并进行理论模拟分析,重点探讨中间压力及环境温度、排气压力等工况参数对系统性能的影响。结果表明:中间压力的取值对基本增压制冷系统COP影响较小;而并行压缩系统的中间压力存在最佳值,范围在5~5.3 MPa,可使系统的最佳排气压力略有降低。中间压力越大,PRC系统BRC系统的最大COP和最大效率提升程度越明显。给定工况下,并行压缩系统的最大COP较BRC提升了19.67%~24.08%,最大效率提升了26.86%~33.04%。Thermodynamic models for system were developed and theoretically simulated for transcritical CO_(2) basic booster(BRC)and parallel compression(PRC)refrigeration systems in supermarkets.The focus was on the influence of operating parameters such as intermediate pressure,ambient temperature and discharge pressure on the performance of the system.The results show that the value of the intermediate pressure has a small effect on the COP of the basic booster refrigeration system.The intermediate pressure for parallel compression systems has an optimal value,ranging from 5 MPa to 5.3 MPa,and can slightly reduce the optimal discharge pressure.The greater the intermediate pressure,the more significant the improvement in maximum COP and maximum exergy efficiency of PRC compared to BRC.Under the given operating conditions,the maximum COP of the parallel compression system is increased by 19.67%~24.08%compared to BRC,and the maximum exergy efficiency is increased by 26.86%~33.04%.

关 键 词：跨临界CO_(2) 增压系统 并行压缩 中间压力 制冷系统 

分 类 号：TB657[一般工业技术—制冷工程]