膨胀阀开度对跨临界CO_2制冷系统火用损失影响的实验研究  

Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO_2 System

作　　者：马娟丽[1] 刘昌海[1] 周骞[1] 陈兴亚 侯予[1,2] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2014年第3期12-16,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50976082);高等学校博士学科点专项科研基金资助项目(20090201110006)

摘　　要：为提高跨临界CO2制冷系统的性能,研究电子膨胀阀开度变化对水-水跨临界CO2制冷系统各个组件相对火用损失的影响,搭建了带电子膨胀阀的水-水跨临界CO2制冷系统实验台,测试了跨临界CO2制冷系统在恒定进水温度、不同电子膨胀阀开度下的运行参数。基于实验数据,给出了不同电子膨胀阀开度下系统性能系数、系统火用效率和各个设备组件的相对火用损失,计算了膨胀阀在最佳开度、气体冷却器侧水进口温度为30℃、蒸发器侧水进口温度为15℃时,各个设备的火用效率。基于最佳膨胀阀开度时系统内各设备的相对火用损失和火用效率的计算结果,分析了各设备性能提高的潜力。计算结果显示:膨胀阀开度在最佳值时,压缩机和气体冷却器的相对火用损失分别为总火用损失的49.4%和18.9%,设备火用效率分别为60.7%和37.6%,压缩机和气体冷却器性能有较大的提升空间。To improve the performance of transcritical CO2 system, the effects of electronic expansion valve（EEV） opening on the exergy loss of different components in the transcritical CO2 system were investigated. The experimental table for the transeritical CO2system with an EEV was constructed, and the operation parameters of the COz system were measured under constant water inlet temperature and different EEV opening. Based on the experimental data, the effects of the EEV opening on the COP, the total exergetic efficiency of system and relative exergy loss of all components were analyzed. The exergetic efficiency for the different components was also presented at the optimal EEV opening, and with the gas cooler side water inlet temperature of 30 ℃ and the evaporator side water inlet temperature of 15 ℃. According to relative exergy loss and exergetic efficiency for all components at the optimal EEV opening, the improvement room of the components was analyzed. The results show that the compressor and the gas cooler accountfor 49.4% and 18.9% of the total two components are 60.7% and endowed with abundant improving exergy loss respectively, and the exergetic efficiencies of these 37.6% respectively. Thus compressor and gas cooler are potential.

关 键 词：跨临界CO2制冷系统 膨胀阀开度 (火用)损失 

分 类 号：TB61[一般工业技术—制冷工程]