夏季工况双层皮玻璃幕墙综合传热系数计算模型

Calculation Model of Comprehensive Heat Transfer Coefficient of Glazing Doubleskin Faade in Summer Working Condition

摘要:

选取适用于夏热冬冷地区的箱体式双层皮玻璃幕墙作为研究对象，建立物理模型.分析该形式幕墙的传热机理，建立能量平衡方程，并给出方程中玻璃和遮阳装置总吸收率以及等效辐射换热系数的计算公式.采用CFD(computational fluid dynamics)方法确定了通风腔中的平均气流速度.结合传热机理，分析了其热阻的构成，给出了总热阻的计算方法，最后求得综合传热系数.

Abstract:

A trunk glazing doubleskin faade applicable to the summer hot and winter cold is selected as the research object.An analysis is made of the mechanism of heat transfer and energy balance equations are obtained.At the same time,formulas for calculating total absorption rate of each faade and equivalent radiative coefficient in each energy balance equation.Air average flow velocity in ventilation cavity is obtained by computational fluid dynamics(CFD) simulation method.Finally in combination with the mechanism of heat transfer,formulas for calculating comprehensive coefficient K of heat transfer are put forward on the basis of an anlysis of the total heat resistance of DSF