摘要
提出一种新型绿色屋顶——“人造植被”屋顶模型,选用人造草皮绿化层与塑料保湿蓄水层替代植被层和基质层,基于传热学原理,采用实验研究的方法进行分析,探讨保湿层的持续蒸散量对室内冷负荷的影响。经研究,主要得到了以下结果:根据所选长沙地区的夏季工况,将“人造植被”屋顶与裸露屋顶进行对比,实验得出裸露屋顶结构层的外表面温度每天会随着太阳辐射强度变化较大,其气温日差在28℃左右,而绿色屋顶结构层外表面温度不会有太大的波动,基本维持在30℃左右,研究发现在下午13:30时两种屋顶结构层外表面温差达到26.2℃;绿色屋顶结构层内表面平均温度变化相较于裸露屋顶而言幅度更小,同样在下午13:30时两者内表面最大温差为12.7℃,因为此时太阳角接近最大值,辐射强度较大。通过实验对比分析进一步说明了屋顶绿化层的隔热效果比较明显。
A new type of green roof-an"artificial vegetation"roof model is proposed.An artificial turf green layer and a plastic moisturizing aquifer are used to replace the vegetation layer and matrix layer.Based on the principle of heat transfer,experimental research methods are used to analyze and dis-cuss the impact of the persistent evapotranspiration of the moisturizing layer on indoor cooling load.Af-ter research,the following results were obtained:According to the summer conditions in the selected Changsha area,the"artificial vegetation"roof was compared with the bare roof.The experiment found that the outer surface temperature of the bare roof structural layer would change greatly with the inten-sity of solar radiation every day.The daily temperature difference was about 28℃,while the outer sur-face temperature of the green roof structural layer would not fluctuate much and basically remained at about 30℃.The research found that the temperature difference between the two roof structural layers reached 26.2℃at 13:30 pm;The average temperature change on the inner surface of the green roof structural layer is smaller than that of the exposed roof.Also at 13:30 pm,the maximum temperature difference on the inner surface of the two is 12.7℃,because the sun angle is close to the maximum and the radiation intensity is large.Experimental comparison and analysis further demonstrated that the insulation effect of roof green layer is relatively obvious.
作者
周耀鹏
黄刘哲
钟吉湘
ZHOU Yaopeng;HUANG Liuzhe;ZHONG Jixiang(School of Civil Engineering,Central South University of Forestry and Technology;Life Cycle Energy Saving Buildings and Environmental Health,Hunan Province Engineering Research Center,Central South University of Forestry and Technology)
出处
《上海节能》
2025年第10期1568-1574,共7页
Shanghai Energy Saving
关键词
绿色屋顶
实验研究
蒸发相变
传热特性
Green Roof
Experimental Research
Evaporative Phase Change
Heat Transfer Charac-teristic
