摘要
建立了通风屋面空气流动的物理模型及数学模型,假定通风道内空气满足Boussinesq假设,并利用FLUENT软件对通风屋面空气流动进行数值模拟计算,分析了通风道直径及室外综合温度对屋面隔热性能的影响。分析结果表明:与传统屋面相比,通风屋面更有利于屋面的隔热,且通风道直径在0.1～0.4m时,通风道直径越大,隔热效果越好;随着室外综合温度的升高,通风道内空气流动速度和热压逐渐增加,相应带走的热量就越多;随着通风道直径的增加,在通风道内距通风道管壁越远的区域,受管壁摩擦力的影响越小,空气流动速度越快。
The physical and mathematical models of air flow in ventilation roof ware established, and boussinesq hypothesis was used for the air in ventilation channel, the numerical simulation calculation of air flow in ventilation roof was carried out based on FLUENT software, and the effect of ventilation channel diameter and outside air comprehensive temperature on heat insulation performance of roof was analyzed. The result shows that： Compared to traditional roof, ventilation roof has better heat insulation performance, and when the ventilation channel diameter is in the range of 0.1-0.4 m, the larger the diameter is, the better the heat insulation effect will be; With the increasing outside air comprehensive temperature, the velocity and thermal pressure of the air in ventilation channel increase gradually, correspondingly carry away more heat; With the increasing ventilation channel diameter, the farther the region in ventilation channel departs from the channel wall, the smaller the effect of wall frictional force will be, and the larger the air velocity will be.
出处
《热科学与技术》
CAS
CSCD
2011年第4期329-333,共5页
Journal of Thermal Science and Technology
基金
黑龙江省教育厅科研项目<屋顶主被动隔热机理及室内热环境耦合热响应研究>资助项目(12511024)
关键词
通风屋面
FLUENT
数值模拟
隔热
ventilation roof
FLUENT
numerical simulation
heat insulation
