极端热湿气候区相变屋顶隔热性能优化分析
景鹏飞1,谢静超1,徐 鑫1,张召锋2,崔 娜3

(1.北京工业大学 绿色建筑环境与节能技术北京市重点实验室,北京 100124; 2.陕西建工安装集团有限公司,陕西 西安 710068; 3.中国京冶工程技术有限公司,北京 100088)

相变; 衰减度; 延迟时间

Optimization analysis of thermal insulation performance of phase change roof in extreme hot-humid region
JING Pengfei1,XIE Jingchao1,XU Xin1,ZHANG Shaofeng2,CUI Na3

(1.Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology,Beijing University of Technology, Beijing 100124,China; 2.SCEGC Installation Group Co., Ltd.,Xi'an 710068, China; 3.China Jingye Engineering Co., Ltd.,Beijing 100088, China)

phase change; attenuation degree; delay time

DOI: 10.15986/j.1006-7930.2021.06.013

备注

为顺应南海岛礁开发建设与可持续发展,针对该地区建筑内部空调负荷较大,传统围护结构节能效果较差的问题.提出将相变屋顶应用于该地区,利用风洞试验测试探究其在不同辐射强度、相变层厚度和水平风速条件下的传热特性.并结合Matlab模拟进一步确定适合该地区的相变层应用形式、厚度及相变温度,结果表明:增大辐射强度可增加屋顶相变层融化和凝固初始阶段的外表面温升速率; 增大相变层厚度及风速均可明显增加延迟时间,而风速对传热衰减度的影响不明显; 当相变层厚度由0 mm增加至40 mm时,各风速下的传热延迟时间平均增加1.6 h,当风速由自然对流增加到3 m/s时,屋顶的传热延迟时间平均减小0.7 h; 相变层在室外侧时可更好地降低内外表面温度并提高屋顶的传热衰减度,相比于相变层在室内侧时传热衰减度提高了1.1倍,内表面峰值温度降低1.6 ℃; 相变层厚度不应超过30 mm; 相变温度区间处于34～36 ℃时传热衰减度最大,为4.73,隔热效果最好.
In order to comply with the development and sustainable development of islands and reefs in the South China Sea, in view of the large air conditioning load in the buildings and the poor energy-saving effect of traditionalenvelope structure in the region, this paper proposes to apply the phase change roof to the region, and uses the wind tunnel test to explore its heat transfer characteristics under different radiation intensities, phase change layer thicknesses and horizontal wind speeds, and then, combined with Matlab simulation to further determine the application form, thickness and phase transition temperature of the phase change layer suitable for this area. The results show that increasing the radiation intensity can increase the temperature rise rate of the outer surface of the roof phase change layer at the initial stage of melting and solidification, and increasing the thickness of phase change layer and wind speed can significantly increase the delay time, but the effect of wind speed on heat transfer attenuation is not obvious. When the thickness of the phase change layer increases from 0 mm to 40 mm, the heat transfer delay time at each wind speed increases by an average of 1.6 h. When the wind speed increases from natural convection to 3 m/s, the heat transfer delay time of the roof decreases by an average of 0.7 h.When the phase change layer is on the outdoor side, it can better reduce the internal and external surface temperature and increase the heat transfer attenuation of the roof. Compared with the phase change layer on the indoor side, the heat transfer attenuation is increased by 1.1 times, and the peak temperature of the inner surface is reduced by 1.6 ℃; the thickness of the phase change layer should not exceed 30 mm; when the phase change temperature range is 34～36 ℃, the heat transfer attenuation is the largest, which is 4.73, and the heat insulation effect is the best.