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Dynamic thermal performance analysis of fiber insulations containing bio-based phase change materials (PCMs)

机译：包含生物相变材料（PCM）的纤维绝缘材料的动态热性能分析

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Experimental and theoretical analyses have been performed to determine dynamic thermal characteristics of fiber insulations containing microencapsulated phase change material (PCM). It was followed by a series of transient computer simulations to investigate the performance of a wood-framed wall assembly with PCM-enhanced fiber insulation in different climatic conditions. A novel lab-scale testing procedure with use of the heat flow meter apparatus (HFMA) was introduced in 2009 for the analysis of dynamic thermal characteristics of PCM-enhanced materials. Today, test data on these characteristics is necessary for whole-building simulations, energy analysis, and energy code work. The transient characteristics of PCM-enhanced products depend on the PCM content and a quality of the PCM carrier. In the past, the only existing readily-available method of thermal evaluation of PCMs utilized the differential scanning calorimeter (DSC) methodology. Unfortunately, this method required small and relatively uniform test specimens. This requirement is unrealistic in the case of many PCM-enhanced building envelope products. Small specimens are not representative of PCM-based blends, since these materials are not homogeneous. In this paper, dynamic thermal properties of materials, in which phase change processes occur, are analyzed based on a recently-upgraded dynamic experimental procedure: using the conventional HFMA. In order to theoretically analyze performance of these materials, an integral formula for the total heat flow in finite time interval, across the surface of a wall containing the phase change material, was derived. In numerical analysis of the southern-oriented wall the Typical Meteorological Year (TMY) weather data was used for the summer hot period between June 30th and July 3rd. In these simulations the following three climatic locations were used: Warsaw, Poland, Marseille, France, and Cairo, Egypt. It was found that for internal temperature of 24 ℃, peak-hour heat gains were reduced by 23-37% for Marseille and 21 -25% for Cairo; similar effects were observed for Warsaw.
机译：已经进行了实验和理论分析，以确定包含微囊化相变材料（PCM）的纤维绝缘材料的动态热特性。随后进行了一系列瞬态计算机仿真，以研究具有不同PCM条件的PCM增强纤维绝缘的木结构墙组件的性能。 2009年，采用热流量计设备（HFMA）提出了一种新颖的实验室规模测试程序，用于分析PCM增强材料的动态热特性。如今，有关这些特性的测试数据对于整栋建筑物的模拟，能源分析和能源法规工作是必不可少的。 PCM增强产品的瞬态特性取决于PCM的含量和PCM载体的质量。过去，PCM现有的唯一现成的热评估方法是使用差示扫描量热仪（DSC）方法。不幸的是，该方法需要小的且相对均匀的测试样本。对于许多PCM增强的建筑围护结构产品，此要求是不现实的。小样本不能代表基于PCM的混合物，因为这些材料不是均匀的。在本文中，基于最近升级的动态实验程序：使用传统的HFMA，对发生相变过程的材料的动态热特性进行了分析。为了从理论上分析这些材料的性能，推导了整个有限时间内的总热流在包含相变材料的壁表面上的积分公式。在对南向墙的数值分析中，典型的气象年（TMY）天气数据用于6月30日至7月3日的夏季炎热期。在这些模拟中，使用了以下三个气候位置：波兰华沙，法国马赛​​和埃及开罗。结果发现，在内部温度为24℃时，马赛和开罗的高峰时热量减少了23-37％，开罗减少了21 -25％；华沙也有类似的效果。

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