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A methodology for experimental evaluations of low-e barriers thermal properties: Field tests and comparison with theoretical models

机译：低电子势垒热性能的实验评估方法：现场测试和与理论模型的比较

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摘要

An open-air experimental apparatus was built to define a common procedure for the thermal properties evaluation of low-e barriers, whose performance in static and dynamic conditions is still an object of debate. The structure hosts a movable wall where single layers can be substituted, allowing the defining of the properties of the system radiant barrier-air gaps, independently of the rest of stratigraphy. The steady-state results have been compared with other methods commonly used for low-e materials such as the guarded hot plate, the hot box method, and the theoretical analysis based on hemispherical emissivity measurements, showing a good agreement among the different approaches. The transient analysis demonstrated that the proposed experimental apparatus permits the direct definition of the radiant barrier dynamic properties, through a previous characterization of the structure without the low-e panel. In fact, when the panel is installed, the performance of the sole package panel-air gaps is easily obtained reducing the errors due to the interference of the rest of the stratigraphy. Besides, the experimental apparatus makes possible the definition of the thermophysical variables necessary for the application of classical theoretical models for unsteady conditions, with results practically overlapped to measured data. A CFD analysis was also implemented: after a validation process, the numerical approach makes it possible to verify the assumptions made for the theoretical analysis, and it constitutes a further possibility for low-e panels performance evaluation.
机译：建立了一个露天实验设备来定义低电子势垒热性能评估的通用程序，该程序在静态和动态条件下的性能仍然是争论的对象。该结构包含一个可移动的壁，在该壁上可以替换单层，从而可以独立于其余地层来定义系统的辐射屏障气隙的属性。将稳态结果与其他低辐射材料常用的方法进行了比较，例如防护热板，热箱法和基于半球发射率测量的理论分析，显示了不同方法之间的良好一致性。瞬态分析表明，通过对结构的先前表征，无需低辐射面板，所提出的实验装置可以直接定义辐射屏障的动态特性。实际上，在安装面板时，很容易获得底部包装面板的气隙性能，从而减少了由于其余地层的干扰而导致的误差。此外，该实验装置还使得定义非稳态条件下应用经典理论模型所必需的热物理变量成为可能，其结果实际上与测量数据重叠。还执行了CFD分析：在验证过程之后，数值方法可以验证理论分析的假设，这为低辐射面板性能评估提供了进一步的可能性。

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