单向切割真空绝热板热桥效应研究  

Thermal Bridge Effect of Unidirectional Cutting Vacuum Insulation Panels

作　　者：赵洪凯[1] 王宗灿 徐岩 ZHAO Hongkai;WANG Zongcan;XU Yan(School of Materials Science and Engineering,Jilin Jianzhu University,Jilin 130119,China)

机构地区：[1]吉林建筑大学材料科学与工程学院,吉林130119

出　　处：《真空科学与技术学报》2023年第9期805-811,共7页Chinese Journal of Vacuum Science and Technology

基　　金：吉林省科技发展计划项目(20210203206SF)。

摘　　要：为了提高单向切割真空绝热板应用的广泛性,重点在于研究其绝热性能,提出以热桥效应为对象进行研究。文章采用线性传热率这一概念作为评价热桥效应的基准量。运用理论分析的方法、建立数学模型,进行了单向切割真空绝热板热桥效应分析。根据稳态传热边界条件,提出了热流传递模型,对阻隔膜的厚度和VIP的总厚度两个参数进行分析和计算。实验结果表明,芯材的厚度与导热、阻隔膜厚度与导热、VIP的大小与拼接之间的缝隙都会对热桥效应造成影响。其中芯材导热和厚度得到提高,阻隔膜导热和厚度降低,拼接缝内填充介质导热和厚度降低,VIP尺寸增加,热桥效应呈减弱趋势。文章通过对比有无热桥效应的单向切割真空绝热板,其有效导热系数可提升42%,进而实现对单向切割真空绝热板的高效利用率,增加其绝热性能。In order to improve the universality of the application of unidirectional cutting vacuum insulation panels,the emphasis is on the research of its thermal insulation performance,and the thermal bridge effect is proposed to be studied.In this paper,the concept of linear heat transfer rate is used as the benchmark to evaluate the thermal bridge effect.By using the method of theoretical analysis and establishing a mathematical model,the thermal bridge effect of the unidirectional cutting vacuum insulation panel is analyzed.According to the steady heat transfer boundary conditions,a heat flow transfer model is proposed to analyze and calculate the thickness of the barrier film and the total thickness of VIP.The experimental results show that the thickness of the core material and heat conduction,the thickness of the barrier and heat conduction,the size of the VIP and the gap between the splices all affect the thermal bridge effect.The heat conduction and thickness of the core material are improved,the heat conduction and thickness of the barrier are reduced,the heat conduction and thickness of the medium filled in the splice joint are reduced,the VIP size is increased,and the thermal bridge effect is weakened.In this paper,the effective thermal conductivity of the unidirectional cutting vacuum insulation plate with or without thermal bridge effect can be increased by 42%,thereby realizing the efficient utilization of the unidirectional cutting vacuum insulation panel and increasing its thermal insulation performance.

关 键 词：单向切割真空绝热板 热桥效应 线性传热率 理论分析 数学模型 

分 类 号：TU551[建筑科学—建筑技术科学]