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真空绝热板(VIPs)等效导热主要表现为芯层材料导热、稀薄气体等效导热和热辐射等效导热等,综合多孔介质芯材结构、板内真空度等因素,建立了VIPs等效导热系数预测数值模型,理论分析了真空度和VIPs有效导热的关系,并选用发泡材料、超细玻璃纤维材料、二氧化硅纳米颗粒材料等三种典型多孔介质作为芯材,制作了三组VIPs并对其板内真空度和导热系数进行了测取,与理论预测模型在真空压力较低时具有良好的一致性。文章所建立的数学模型及分析方法对VIPs的生产和推广应用具有指导意义。
The equivalent heat conduction of vacuum insulation panels (VIPs) mainly includes the thermal conductivity of the core material, the equivalent thermal conductivity of the lean gas and the equivalent thermal conductivity of the thermal radiation. Based on the core structure of the porous media and the degree of vacuum in the plate, VIPs equivalent thermal conductivity Coefficient prediction model, the relationship between the degree of vacuum and the effective heat conduction of VIPs was theoretically analyzed. Three typical porous media such as foamed material, ultra-fine glass fiber material and silica nanoparticle material were selected as the core material. Three VIPs The vacuum degree and thermal conductivity of the plate were measured, which was in good agreement with the theoretical prediction model when the vacuum pressure was low. The mathematical models and analysis methods established in this paper are instructive for the production and popularization and application of VIPs.