真空绝热板具有良好的绝热性能,为节能目的,尤其是建筑领域,提供行之有效的热屏障,但其使用寿命成为诸多研究人员、制造商和用户最为关心的关键问题。隔气结构是维持真空绝热板内真空度的重要组成元件,其性能对真空绝热板的热工性能和使用寿命影响甚大。采用试验的方法只能在有限的时间内对其使用寿命研究,理论预测其使用寿命尤为重要。文章研究了气体和水蒸汽通过隔气结构膜渗透到板内对其等效导热系数的影响,采用数值分析的方法建立了相应数学模型,选取了三种典型隔气结构膜,测试了其相关性能参数指标,对其制得的真空绝热板,理论分析了导热系数变化规律,并对其使用寿命进行了评估。 Vacuum insulation panels have good thermal insulation properties and provide effective thermal barriers for energy saving purposes, especially in the construction field, but their service life has become a key issue of most concern to many researchers, manufacturers and users. The gas-barrier structure is an important component of maintaining the vacuum in the vacuum insulation panel, and its performance has a great influence on the thermal performance and service life of the vacuum insulation panel. The test method can only be used for a limited period of time to study its service life, theoretical prediction of its life is particularly important. In this paper, the influence of gas and water vapor infiltrated into the plate through the gas-permeable membrane on the equivalent thermal conductivity was studied. The corresponding mathematical model was established by numerical analysis. Three typical gas-barrier membranes were tested and their correlations were tested Performance parameters of the vacuum insulation panels made of its theoretical analysis of the thermal conductivity of the law of change, and its service life were evaluated.