Study on the performance characteristics of R404A refrigeration system by medium pressure charge gas
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%.
medium pressure charge gascooling performancerefrigeration systemambient temperature
NETL
NSTL
万方数据
