被动蒸发与架空遮阳不同组合对屋面防热降温的影响  

Effect of Different Combinations of Passive Evaporation and Venti-Shading on Thermal Protection and Temperature Reduction of Roof

作　　者：王波[1] 冉茂宇[1] WANG Bo;RAN Maoyu(College of Architecture,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学建筑学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2018年第5期689-695,共7页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51678254);华侨大学研究生科研创新能力培育计划资助项目(1611305007)

摘　　要：为了探究被动蒸发与架空遮阳综合作用对屋面防热降温的影响,基于蓄水多孔质蒸发冷却,提出架空蒸发遮阳与实铺遮阳蒸发两种屋面防热方式;然后,通过搭建混凝土屋面实验小室,在厦门典型夏季气候条件下,测试两种防热方式对屋面上下表面温度及水分蒸发量的影响.结果表明:相对于裸露的混凝土屋面,两种防热方式都有较好的降温效果,但是相互之间差别不明显;实铺遮阳蒸发方式比架空蒸发遮阳方式在白天耗水量明显减少,在夜间略有增加,但总体表现为耗水量明显减少,具有更好的持续降温效果;架空蒸发遮阳多孔质水分蒸发速度主要与太阳辐射有关,而实铺遮阳蒸发多孔质水分蒸发速度则与多种因素有关,如空气温湿度、风速、遮阳板热辐射等.In order to investigate the integrated effect of passive evaporation and venti shading on the thermal protection and temperature reduction of roof,two thermal protection methods of venti shading with evaporation and evaporation with venti shading were proposed based on porous medium evaporative cooling.Several small test chambers with concrete roof were set up to test the effects of these two methods on the temperature reduction of roof.The surface temperatures of roof and evaporated water volumes of porous medium were measured in Xiamen typical summer climate conditions.The results show that:comparing with bare concrete roof,the two methods with porous medium evaporation can obviously reduce the surface temperatures of roof,but the difference between them is not obvious.Comparing to the method of venti shading with evaporation,the method of evaporation with venti shading consumes much less water evaporation volume during the daylight,and little more evaporation volume at night.The overall performance is that the water consumption is significantly reduced in the method of evaporation with venti shading,which has a better continuous cooling effect.In the method of venti shading with evaporation,the water evaporation rate of porous medium is mainly related to solar radiation;in the method of evaporation with venti shading,the water evaporation rate is also related to other factors,such as ambient temperature and humidity,wind speed,sun visor heat radiation and so on.

关 键 词：防热降温 多孔质 架空蒸发遮阳 实铺遮阳蒸发 被动蒸发冷却 

分 类 号：TU111.41[建筑科学—建筑理论]