低频率下电子膨胀阀调节对制冷系统性能的影响

发布时间：2018-02-12 13:04

本文关键词： 变频压缩机电子膨胀阀过热度系统性能　出处：《制冷学报》2016年06期 　论文类型：期刊论文

【摘要】：以R32变制冷剂流量制冷系统实验装置为研究对象,通过改变变频压缩机频率和电子膨胀阀开度,对低频率下电子膨胀阀调节对系统性能的影响进行了实验分析。研究结果表明:1)系统制冷量和质量流量在各频率下变化规律相同;2)当控制蒸发器出口过热度在2 K附近时,低频率范围(25~35 Hz)内存在一个最佳频率点,与其他各频率相比,其系统COP最高;3)低频率下压缩机在过热度0 K附近极少量的吸气带液就会对系统性能造成严重影响,这在实际运行中需要极力避免;4)低频率下(25~35 Hz)控制过热度从0 K变为10 K,电子膨胀阀调节区间为4%~9%,而高频率下(40~50 Hz)调节区间为15%~23%,提高冷冻水温度可以有效改善低频下电子膨胀阀的调节性能。以上结论可以推广到其他变制冷剂流量系统,如变频热泵空调和汽车空调等。
[Abstract]:Taking the experimental device of R32 variable refrigerant flow refrigeration system as the research object, the frequency of frequency conversion compressor and the opening degree of electronic expansion valve are changed. The effect of electronic expansion valve regulation on the system performance at low frequency is analyzed experimentally. The results show that the refrigerating capacity and mass flow rate of the system vary in the same law at different frequencies (2) when the superheat at the outlet of the evaporator is controlled near 2 K. There is an optimum frequency point in the low frequency range (25 ~ 35 Hz). Compared with other frequencies, the system COP has the highest frequency of 3) and at low frequency, the compressor will have a serious impact on the performance of the system with a very small amount of aspirating fluid near the superheat of 0 K. In practice, we should try our best to avoid the overheat from 0 K to 10 K at low frequency. The electronic expansion valve regulation range is 4 / 9, while at high frequency, 40 ~ (50) Hz) is 15 ~ 2 ~ 23. Raising the temperature of refrigerated water can effectively improve the low temperature. This conclusion can be extended to other variable refrigerant flow systems. Such as frequency-conversion heat pump air-conditioning and automobile air-conditioning and so on.
【作者单位】：上海理工大学能源与动力工程学院制冷与低温工程研究所;
【基金】：上海市动力工程多相流动与传热重点实验室(1N-15-301-101)项目资助~~
【分类号】：TB657

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