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
李海军 1许琦 1苏志勇 1王瑞 1袁铁锁 2楚雪靖2
作者信息
- 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
- 折叠
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 4 200 r/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%.
Abstract
Aiming at the problems of high exhaust temperature and low refrigeration efficiency of the refrigeration system of pure electric refrigerated vehicle under low tem-perature conditions,a new refrigeration system of microchannel heat exchanger with vari-able 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 4 200 r/min,the temperature outside the library is 32℃,the temperature inside the library is-15℃,and the air volume of the heat ex-changer 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 super-heat of the main valve and the opening of the supplementary valve are 5 K and 25%re-spectively.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Key words
medium pressure charge gas/cooling performance/refrigeration system/ambient temperature引用本文复制引用
出版年
2024
NETL
NSTL
万方数据