调湿建材在湿驱动势下对围护结构与室内热湿分布的影响

项目名称： 调湿建材在湿驱动势下对围护结构与室内热湿分布的影响

项目编号： No.51308333

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 张会波

作者单位： 上海交通大学

项目金额： 25万元

中文摘要： 调湿建材作为功能性材料的开发应用，尽管可以缓解围护结构和室内空间的湿度变化幅度，但是关于调湿建材对围护结构和室内温度、湿度、气流分布的作用机理的研究几乎没有。由于多孔介质建筑材料内热湿动态传递过程的复杂性，既往理论模型中使用的材料导热系数是在绝干状态下测量的定值。而实际建筑围护结构中，尤其是保温材料内含有大量水分，整体围护结构在使用状态下热工性能远比模拟评价的性能低下。本项目基于传热学、能量守恒、质量守恒基本原则，考虑材料导热系数在不同含水率下的变化，提出更为准确的多孔介质建筑材料内热湿传递过程理论模型；通过实验掌握不同气流分布下，调湿建材表面的传热传质规律；建立围护结构热湿动态传递与室内空间CFD计算的耦合模型，并通过吸放湿实验验证耦合计算模型。本项目为准确评价围护结构使用过程中的热工性能；解决围护结构由于湿度变化过大造成的能源损失、结露、发霉等问题提供理论依据。

中文关键词： 湿度；健康；调湿建材；热湿传递；计算流体力学

英文摘要： Although building hygroscopic materials may be applied to alleviate the humidity variation, nevertheless, research efforts are so far scarce on the conditioning mechanisms of these materials on the envelope structure, indoor temperature, humidity and air flow distribution. Owing to the complexity in the heat and moisture dynamic transfer process in the porous building materials, the thermal conductivity used in conventional theoretical models are typically those measured under absolute dry conditions. In consequence, the thermo-engineering performance of the whole building envelope in service is much lower than predicted by simulation as there are a great quantity of moisture in the envelope, particularly in the insulated materials.Based on basic principles of heat transfer and energy/mass conservation, the proposed research aims at establishing a theoretical model of heat and moisture transfer in the porous building materials by taking into account the moisture percentage dependence of thermal conductivity. The heat and mass transfer on the surface of humidity conditioning materials will also be experimentally investigated under different air flow distribution. Moreover, coupling model of heat and humidity dynamic transfer in the envelope with indoor CFD simulation will be established and then validated by mois

英文关键词： Humidity；healthy；hygroscopic material；heat and moisture transfer；CFD