Considering building envelope elements in hot locations, windows contribute to about one-third of the building’s total cooling load since heat is transferred effortlessly through transparent elements more than opaque ones. The present work experimentally explores the energy advancements of a phase change material (PCM) loaded in the air gap of a double-pane window. The PCM window was examined under Southern Iraq weather conditions and compared with an identical air–gap double-pane window at various orientations. Numerous energy indicators were analyzed, including the improvement in the average indoor temperature, attenuation coefficient, and time delay to quantify the PCM’s usefulness to the built environment at different orientations. Study outcomes depicted remarkable energy improvements for the PCM in all orientations over the reference window in which the indoor temperature was reduced as much as 23 °C, and shifted by up to 50 min over the reference case. Conclusively, the PCM window could notably shave peak temperature when exposed to high solar radiation for a short period, while it could shift peak temperature mostly if oriented towards longtime solar radiation.

中文翻译：

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通过将相变材料集成到不同方向的双层玻璃窗中来推进建筑围护结构


考虑到高温位置的建筑围护结构构件，窗户约占建筑物总冷却负荷的三分之一，因为热量比不透明构件更容易通过透明构件传递。这项工作实验性地探索了加载在双层玻璃窗气隙中的相变材料 （PCM） 的能量进步。在伊拉克南部的天气条件下对 PCM 窗户进行了检查，并与不同方向的相同气隙双层玻璃窗进行了比较。分析了许多能源指标，包括平均室内温度、衰减系数和时间延迟的改善，以量化 PCM 在不同方向上对建筑环境的有用性。研究结果显示，在参考窗口上，PCM 在所有方向上的能量都有显著改善，其中室内温度降低多达 23 °C，并在参考情况下偏移高达 50 分钟。总之，当短时间暴露在高太阳辐射下时，PCM 窗口可以显着降低峰值温度，而如果面向长时间太阳辐射，它主要可以改变峰值温度。