一种多层墙体热湿耦合传递新模型与实验验证
首发时间:2009-11-06
摘要:本文以墙体中的空气含湿率和温度为驱动势建立了多层墙体的一维瞬态热湿耦合传递方程,运用有限差分法对控制方程进行求解。为了验证模型的正确性,建立了一个实验装置测试墙体内的温度和相对湿度,并将实验结果跟模型预测结果进行了对比,模型预测结果跟试验测试结果吻合良好。该模型不需要确定各材料层间的边界条件,所需的材料物性参数相对来说比较少且容易得到,具有广泛的适用性。
关键词: 建筑 多层墙体 热湿耦合传递 有限差分法 实验验证
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A new modeling and its experimental evaluation for coupled heat and moisture transfer in multilayer walls
Abstract:Based on the heat and moisture transfer through porous media, a 1-D transient hygrothermal model for multilayer wall was established by using air humidity ratio in wall and temperature as the driving potentials. The solution for the governing equations was obtained numerially by implementing the finite-difference scheme. To evaluate the accuracy of the model, a test system is setup to measure relative humidity and temperature within a porous wall and compare with the prediction of the model. The prediction results have good agreement with the experimental results. The presented model doesn’t need to determine the interface conditions between different materials and requires material properties which are comparatively simple and easy to determine. Hence, it has general applicability.
Keywords: building multilayer wall coupled heat and moisture transfer inite difference method experimental evaluation
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