内部真空度对真空绝热板导热系数的影响

真空绝热板板内真空度是影响真空绝热板绝热性能的关键因素之一,通过合理地降低板内真空度以降低板内残余气体引起的导热,继而以维持其较低的导热系数。在真空绝热板芯材内部埋置微型压力传感器,通过测量板内残余气体压力变化,检测真空绝热板内的真空度,并结合大平板导热仪,获取对应压力下的真空绝热板导热系数。通过实验和理论模型计算得到板内真空度与真空绝热板绝热性的关系,以及得到真空绝热板板内真空度与导热系数的最佳组合。

Influence of internal vacuum on thermal conductivity of vacuum insulation panels

Vacuum in the vacuum insulation panel is one of the key factors affecting the thermal insulation performance of the vacuum insulation panel. By reasonably reducing the vacuum inside the panel to reduce the heat conduction caused by the residual gas in the panel, the lower thermal conductivity is maintained. In this paper, a miniature pressure sensor was embedded inside the core material of the vacuum insulation board. By measuring the change of residual gas pressure in the panel, the vacuum degree in the vacuum insulation panel was detected, and the thermal conductivity of the vacuum insulation panel under the corresponding pressure was obtained by combining the large plate heat conduction meter. Through the experimental and theoretical models, the relationship between the vacuum degree of the panel and the thermal insulation of the vacuum insulation pane lwas obtained, and the optimal combination of vacuum degree and thermal conductivity in the vacuum insulation panel was obtained.