双室热保护法测VIP导热系数的测试装置及实验研究

Device for Measuring the Heat Conduction Coefficient of a Vacuum Insulation Plate By Using a Dual-chamber Heat Protection Method and Its Experimental Study

传统的测试真空绝热板(VIP)导热系数的平板热保护法,受VIP尺寸限制及热桥效应影响,存在弊端。通过分析双室热保护法测定VIP导热系数的原理,设计了测试装置。外室作为热保护装置,内室作为测试加热装置,基于稳态下测试VIP平板的导热系数,该装置不受VIP尺寸限制,减少了热桥效应。找出了影响测试结果的因素做了理论误差分析,与标定值对比,测试结果较精确。该装置可以用于VIP出厂前导热系数的测试及用过的VIP老化程度检验。

The traditional plate heat protection method for testing the heat conduction coefficient of a vacuum insulation plate(VIP) is limited by the dimensions of a VIP and affected by the heat bridge effect,thus,there exist certain demerits.The authors introduced a principle for determining the heat conduction coefficient of a VIP by using a dual-chamber heat protection method and designed a testing device.With the outer chamber serving as a heat protection device and the inner chamber serving as a testing and heating device,the heat conduction coefficient of the VIP was tested under a steady state.The device is not limited by the dimensions of the VIP with the heat bridge effect being reduced.The authors also analyzed the factors influencing the test results and the theoretical error.The test result was relatively precise when compared with the calibrated value.The device under discussion can be used for testing the heat conduction coefficient of a VIP before it leaves the works and inspecting the aging degree of any used VIP.