竹材组合墙体构件热湿耦合迁移特性

Coupled Heat and Moisture Transfer in Bamboo Composite Wall

以多孔介质传热传质学为基础,建立以湿度梯度为热源或热汇,以温度梯度作为湿源或湿汇的建筑构件内热湿耦合迁移的动态数学方程。提出用传递函数分析方法研究建筑构件内的热湿耦合过程,利用Laplace变换方法求解耦合方程。使用该方法对竹材组合墙体构件竹板进行了热湿耦合过程的分析计算,得到了竹板内温度和含湿量的动态分布特性。计算结果与实测值吻合较好,表明本文建立的数学模型和求解方法合理可信,有利于竹结构组合墙体的特性研究,也有利于竹材作为一种新型建筑材料的发展。

Based on the mechanism of heat and moisture transfer through porous media,the dynamic mathematical equations for the coupled heat and moisture transfer in building components are derived,in which the humidity gradient is considered as the heat source or heat sink,and the temperature gradient is considered as the moisture source or moisture sink.Meanwhile,an analytical method by using the transfer function is proposed to study the processes of coupled heat and moisture transfer in building elements.In this paper,the analytical calculations are carried out for the coupled heat and moisture transfer in bamboo plywood of a bamboo composite wall,to obtain the transient distributions of temperature and moisture content by using the above method.The results agree with the measured data,which shows that the mathematical equations and the solving method presented are reliable,and can be used to study bamboo composite walls,as well as for the development of bamboo as a new building material.