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Thermal behavior analysis of hollow bricks filled with phase-change material (PCM)
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2020-04-28 , DOI: 10.1016/j.jobe.2020.101447
Yanna Gao , Fan He , Xi Meng , Ziyun Wang , Ming Zhang , Hanting Yu , Weijun Gao

Light-weight materials are comprehensively used to reduce the building weight in high-rise or super high-rise buildings, but they will reduce building thermal inertia remarkably, which can increase the air-conditioning load fluctuation and reduce indoor thermal comfortable. According to this condition, phase-change material (PCM) is filled to hollow bricks to improve thermal behavior by latent thermal storage. A numerical model with the heat transfer process of melting-solidifying was built, and a full-scale experiment was done to verify this model. Due to the filled PCM, the thermal performance of hollow bricks was improved obviously from experimental and numerical results. Under suitable phase-change temperature, the filled PCM can reduce the attenuation rate from 13.07% to 0.92%–1.93% and increase the delay time from 3.83 h to 8.83h–9.83 h. Meanwhile, the filled PCM can reduce the peak heat flux from 45.26 W/m2 to 19.19 W/m2-21.4 W/m2, but cannot reduce the average value. In addition, inner cavities were the better choice for PCM and there was an extra phase-change extent of close to 90% in favor of the different outdoor thermal environment. Finally, influence rules of latent heat and thermal conductivity coefficient of PCM were analyzed on temperature and heat flux in inner surfaces.



中文翻译:

相变材料(PCM)填充空心砖的热行为分析

轻质材料被广泛用于减轻高层或超高层建筑的建筑重量,但它们将显着降低建筑物的热惯性,从而增加空调负荷的波动并降低室内的热舒适性。根据此条件,相变材料(PCM)被填充到空心砖中,以通过潜热存储来改善热性能。建立了具有熔融-凝固传热过程的数值模型,并进行了全面的实验以验证该模型。实验和数值结果表明,由于填充了PCM,空心砖的热性能得到了明显改善。在合适的相变温度下,填充的PCM可以将衰减率从13.07%降低到0.92%–1.93%,并将延迟时间从3.83 h增加到8.83h–9.83 h。同时,填充的PCM可以将峰值热通量从45.26 W / m2降低到19.19 W / m2-21.4 W / m2,但不能降低平均值。此外,内腔是PCM的更好选择,并且由于不同的室外热环境,相变程度接近90%。最后,分析了PCM的潜热和导热系数对内表面温度和热通量的影响规律。

更新日期:2020-04-28
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