电子膨胀阀开度对PV/T-SAHP系统性能的影响  

THE INFECTION OF THE OPENING OF THE ELECTRONIC EXPANSION VALVE ON PV/T-SAHP SYSTEM

作　　者：王海涛[1,2] 季杰[1] 裴刚[1] 何伟[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027 [2]安徽建筑工业学院环境工程学院,合肥230022

出　　处：《太阳能学报》2009年第2期201-205,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金项目(50478023)

摘　　要：压缩机频率固定,不同的电子膨胀阀开度下,对PV/T-SAHP系统的动态性能进行了实验和分析,根据实验结果发现,系统的COP值随冷凝水温的升高而降低,光电效率的峰值发生在工质蒸发对光伏模块的冷却作用与太阳辐照度和空气对集热/蒸发器表面的加热作用的平衡点,而并非太阳辐照度最高点。在电子膨胀阀开度一定时,随着太阳辐照度的升高,压缩机功率出现振动,当电子膨胀阀开度最大时,系统振动更加明显。由此提出了光伏-太阳能热泵(PV/T-SAHP)的系统稳定性原理。同时指出优化PV/T-SAHP系统的关键问题是找到系统集热/蒸发器的MSS线(Q—T_(sh)关系曲线)。Fixing the frequency of compressor, under different opening of Electronic Expansion Valve （EXV） , outdoor tests were conducted on the PV-SAHP system. The dynamic behavior of PV-SAHP was analyzed. The COP of the system reduced along with the raising of temperature of the condensing water. The peak value of the photovohaic efficiency is oc- curred while the balance between the cooling influence of the vaporizing working material to the PV module and the heat- ing influence of the air to the collector/evaporator, not the vertex of the solar radiation. The power vibration of the com- pressor appeared when the raising of the solar radiation at a fixing opening of EXV, and the vibration was especially evi- dent at the maximum opening of the EXV. Therefore, the stability principal of the PV-SAHP system was put forward. At the same time, it was found that the key of the PV/T-SAHP study is to discover the relation between the solar radiation and the superheat of collector/evaporator.

关 键 词：PV/T-SAHP系统 电子膨胀阀开度 稳定性 

分 类 号：TK519[动力工程及工程热物理—热能工程]