墙体材料理论湿渗透模型与应用分析

Theoretical Moisture Penetration Depth Model of Building Wall Material and its Application Analysis

在室内外环境的影响下,墙体内存在热湿传递。建立了单层墙体材料(或调湿材料)理论湿渗透模型并对模型进行了求解。计算出了常用不同建筑材料在不同湿周期作用下的理论湿渗透厚度。计算结果表明理论湿渗透厚度随环境湿变化周期增大而增大,同时不同建筑材料的理论湿渗透厚度也差异很大。在计算墙体与室内湿交换的模型中,等效湿渗透模型应用较广泛。但该模型基于材料不被穿透的假设获得的,理论湿渗透厚度可用来检查等效湿渗透模型的有效性。该理论厚度也可作为调湿材料厚度设计时的参考。

Thermal and moisture transfer exists in building wall due to the disturbances of indoor environment and ambient. This paper present the theoretical moisture penetration model （TMPD-model） of a single-layer building material and its solution. The theoretical moisture penetration depths are presented for various conventional building materials under different moisture periods. The results show that the theoretical moisture penetration depth increases with the moisture period, and the theoretical moisture penetration depths of various materials differ significantly. In calculation of moisture transfer between the material and the indoor air, the effective moisture penetration depth （EMPD） model is usually used. However, the EMPDmodel is based on the assumption that the moisture does not penetrate through the material layers. The theoretical moisture penetration depth can be used to check the effectiveness of the EMPDmodel. The theoretical moisture penetration depth can also be used for material design reference.