中压补气对R404A冷冻系统性能特性研究  

Study on the performance characteristics of R404A refrigeration system by medium pressure charge gas

作　　者：李海军[1] 许琦 苏志勇 王瑞 袁铁锁 楚雪靖 Li Haijun;Xu Qi;Su Zhiyong;Wang Rui;Yuan Tiesuo;Chu Xuejing(Zhongyuan University of Technology College of Energy and Environment;Henan Construction Engineering Co.,Ltd.)

机构地区：[1]中原工学院能源与环境学院 [2]河南万佳建设工程有限公司

出　　处：《制冷与空调》2024年第9期34-39,共6页Refrigeration and Air-Conditioning

基　　金：河南省研究生教育改革与质量提升工程项目(YJS2021JD08)。

摘　　要：针对纯电动冷藏车冷冻系统在低温工况下出现的排气温度过高、制冷效能较低等问题,研发并搭建了一套采用变频换热风机的微通道换热器新型冷冻系统,研究车厢外环境温度持续增长时,中压补气技术对冷冻系统性能的影响。结果表明:当压缩机转速为4200r/min,库外温度为32℃,库内温度为-15℃,车内换热器风量为80%时,通过试验数据对比分析发现主阀的过热度和补阀的开度分别为5K和25%时冷冻系统制冷性能最佳;当冷冻系统主补阀开度为最佳时,变化库外环境温度发现,与不补气系统对比,系统采用中压补气时,排气温度降低了12.53%~33.80%,制冷量提高了8.38%~16.73%,压缩机功率增加了5.71%~13.07%,COP值上升了2.94%~4.17%。Aiming at the problems of high exhaust temperature and low refrigeration efficiency of the refrigeration system of pure electric refrigerated vehicle under low temperature conditions,a new refrigeration system of microchannel heat exchanger with variable frequency heat exchange fan was developed and built to study the influence of medium pressure vapor injection technology on the refrigeration performance of the system when the ambient temperature outside the compartment continued to increase.The results show that when the compressor speed is 4200 r/min,the temperature outside the library is 32℃,the temperature inside the library is -15℃,and the air volume of the heat exchanger in the vehicle is 90%,the experimental data are compared and analyzed.It is found that the refrigeration system has the best refrigeration performance when the superheat of the main valve and the opening of the supplementary valve are 5 K and 25% respectively.When the main filling valve of the refrigerating system is open to the best,it is found that the ambient temperature outside the reservoir is changed.Compared with the non-filling system,the exhaust temperature is reduced by 12.53%~33.80%,the cooling capacity is increased by 8.38%~16.73%,and the compressor power is increased by 5.71%~13.07%.COP increased by 2.94%to 4.17%.

关 键 词：中压补气 制冷性能 冷冻系统 环境温度 

分 类 号：TB6[一般工业技术—制冷工程]