微通道换热器中制冷剂分布的量化:红外热成像法与电容法  

Quantification of refrigerant distribution in microchannel heat exchangers:infra-red imaging and capacitive methods

作　　者：李厚培 刘鹤群 李洪强[1,2] Li Houpei;Liu Hequn;Li Hongqiang(College of Civil Engineering,Hunan University;Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education at Hunan University)

机构地区：[1]湖南大学土木工程学院 [2]建筑安全与节能教育部重点实验室

出　　处：《制冷与空调》2025年第1期61-68,共8页Refrigeration and Air-Conditioning

基　　金：国家重点研发计划项目(基于低GWP制冷剂的压缩机优化设计关键技术研究及设备研发2023YFC3806401)。

摘　　要：微通道换热器具有高比表面积,高换热系数,高热流密度等优势,应用于多个领域。然而,两相流流量分布不均问题导致了其换热量有所损失。目前,可视化、光学法、超声波等方法应用于两相流研究,但在工程应用上仍有一定问题。因此,该研究提出了以红外热成像以及电容法作为研究微通道换热器流量分布的手段。结合红外热成像图片以及换热器模拟仿真,可以获得微通道管的入口状态的分布情况。通过在集流管内放入电容传感器,可以估算集流管内的干度分布。通过这两种方法,可以有效地量化微通道换热器的制冷剂两相流分布情况,从而深入探究分液不均的机理与改善分液的方法。Microchannel heat exchangers have advantages such as high specific surface area,high heat transfer coefficient,and high heat flux,etc.making them applicable in various fields.However,issues with non-uniform two-phase distribution can lead to a reduction in efficiency.Currently,methods such as visualization,optical techniques,and ultrasound are employed in two-phase flow studies,yet challenges remained when applied them to heat exchangers studies.Therefore,this study proposes using infrared thermography and capacitive methods to investigate flow distribution in microchannel heat exchan-gers.By combining infrared thermography images with heat exchanger simulations,the distribution of inlet flow rates and vapor quality within the microchannel tubes can be obtained.Additionally,by placing capacitive sensors inside the header,it is possible to calculate the vapor quality distribution within the header based on the different dielectric constants of the refrigerant in its liquid and vapor states.These two methods allow for the quantification of the two-phase flow distribution in various parts of the microchannel heat exchanger,thereby facilitating a deeper exploration of the mechanisms of flow maldistribution and methods for improving distribution.

关 键 词：微通道换热器 红外热成像 电容测量 两相分配 

分 类 号：TK172[动力工程及工程热物理—热能工程] TP391.41[自动化与计算机技术—计算机应用技术]