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Lab-Scale Dynamic Thermal Testing of PCM-Enhanced Building Materials

机译：PCM增强建筑材料的实验室规模动态热测试

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Previous research studies have shown that incorporation of the phase-change material (PCM) in a building envelope material/component may bring significant reduction in the building energy consumption. A detailed knowledge of the key phase-transition (dynamic) properties, such as latent heat, sub-cooling, hysteresis during melting and freezing, etc., of the PCM-enhanced building materials is required to perform the whole building energy simulations and code work. In addition, the dynamic test data is critical in optimizing the distribution and location of the PCM within a building to maximize the energy savings. Until recently, the differential scanning calorimeter (DSC) has been the only available method to determine the dynamic properties of a PCM. Unfortunately, the DSC method is valid for small and homogeneous specimens, and is incapable of capturing the complexities observed in large-scale building components. Materials with non-uniform temperature distribution and non-homogeneity caused by the presence of additives, such as fire retardants, conduction inhibitors, and adhesives, cannot be analyzed by the DSC testing method. Dynamic heat-flow meter apparatus (DHFMA) is a recently developed method for dynamic property measurement of system-scale PCM and other building construction products. Although the DHFMA method is gaining acceptance among the scientific and research community, it is still under development. In this study, we focus on advancing the development, and conducting the validation of the DHFMA method. A detailed description of the DHFMA method is presented to highlight the difference with the conventional HFMA method. Next, a large-scale bio-based shape-stabilized PCM (ss-PCM) sample was tested using both DHFMA and DSC test methods. Specific heat as a function of temperature data measured by DHFMA method was found to be in very good agreement with slowest ramp and step data. This is the first direct verification of the HFMA method with the DSC method for PCMs.
机译：先前的研究表明，将相变材料（PCM）掺入建筑围护结构材料/组件中可以显着降低建筑能耗。需要详细了解PCM增强的建筑材料的关键相变（动态）特性，例如潜热，过冷，熔化和冻结期间的滞后等，以执行整个建筑能耗模拟和编码。工作。此外，动态测试数据对于优化建筑物内PCM的分布和位置以最大程度地节省能源至关重要。直到最近，差示扫描量热仪（DSC）仍是确定PCM动态特性的唯一可用方法。不幸的是，DSC方法适用于小型且均质的样本，并且无法捕获在大型建筑组件中观察到的复杂性。由于添加剂（例如阻燃剂，导电抑制剂和粘合剂）的存在而导致温度分布不均匀且不均匀的材料无法通过DSC测试方法进行分析。动态热流量计设备（DHFMA）是一种用于系统规模PCM和其他建筑产品的动态特性测量的最新开发方法。尽管DHFMA方法已在科研界获得认可，但仍在开发中。在这项研究中，我们专注于推进开发，并进行DHFMA方法的验证。介绍DHFMA方法的详细说明以突出显示与传统HFMA方法的区别。接下来，使用DHFMA和DSC测试方法对大型生物形状稳定的PCM（ss-PCM）样品进行了测试。发现通过DHFMA方法测得的比热与温度数据的函数与最慢的斜坡和阶跃数据非常吻合。这是用PCM的DSC方法首次对HFMA方法进行直接验证。

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