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首页> 外文学位 >Hygrothermal performance of different wood-frame wall assemblies wetted by simulated rain infiltration.
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Hygrothermal performance of different wood-frame wall assemblies wetted by simulated rain infiltration.

机译：模拟雨水浸润润湿的不同木结构墙组件的湿热性能。

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摘要

The infiltration of rainwater can result from envelope defects that allow water to infiltrate into the stud cavity behind the exterior sheathing, i.e. the back wall. Once rainwater migrates into the stud space, it cannot easily evacuate and is thus likely to accumulate, leading to potential degradation of the wood studs and exterior sheathing, depending on the temperature conditions. Therefore, studying the drying potential of wood-frame wall assemblies that have been subjected to a moisture load like rain infiltration can provide valuable information with respect to the assembly's hygrothermal performance.; The primary objectives of the research project were: (1) To evaluate the wetting and drying performance of hygroscopic components in wood-frame wall assemblies wetted by rain infiltration; (2) To investigate the impact of several parameters on the hygrothermal response of the various monitored components such as the sheathing material, the type of vapor retarder, and the presence of foam insulation on the exterior side of the assembly, (3) To develop a framework for large-scale envelope testing of wall assemblies subjected to wind-driven rain infiltration.; The role of the vapor retarder, the exterior insulation, an added exterior insulation, the wall height, the presence of hygroscopic cladding was studied and the effect of varying the moisture load was also investigated. The research was primarily experimental but also included some simulation work.; The moisture content results from the experiments show that the sheathing material had the most significant impact on the drying response of the wall components, with the lowest and highest drying rate occurring when OSB and fiberboard sheathings were employed, respectively. Increasing the vapor permeability of the vapor retarder within the range allowed by the National Building Code of Canada increased the drying rate of the wetted components within the walls when OSB sheathing was employed. Comparison of the experimental and numerical results highlighted the difficulties in simulating a three-dimensional problem in a two-dimensional domain, the need for accurate and complete material properties, and the need to include of all relevant transport phenomena like air transport in hygrothermal envelope models to increase the accuracy of the simulation results. (Abstract shortened by UMI.)
机译：雨水的渗透可能是由包膜缺陷引起的，该缺陷使水渗透到外部护套（即后壁）后面的螺柱腔中。雨水一旦迁移到双头螺栓空间中，就无法轻易撤离并因此可能积聚，从而导致木双螺栓和外部护套的潜在降解，具体取决于温度条件。因此，研究经受了诸如雨水渗透等湿气负荷的木结构墙组件的干燥潜力，可以为该组件的湿热性能提供有价值的信息。该研究项目的主要目的是：（1）评估被雨水浸润的木结构墙组件中的吸湿性部件的润湿和干燥性能； （2）研究几个参数对各种受监控组件的湿热响应的影响，例如护套材料，阻气剂的类型以及组件外侧是否存在泡沫绝缘，（3）一个框架，用于对遭受风雨渗透的墙组件进行大规模的包络测试；研究了阻气剂，外部隔热材料，增加的外部隔热材料，壁高，吸湿性包层的存在以及吸湿率变化的影响。研究主要是实验性的，但也包括一些仿真工作。实验得出的水分含量表明，护套材料对壁组件的干燥响应影响最大，分别使用OSB和纤维板护套时，干燥速率最低和最高。当使用OSB护套时，将蒸气阻滞剂的蒸气渗透率提高到加拿大国家建筑规范允许的范围内，可以增加壁内湿组件的干燥速率。实验和数值结果的比较突出了在二维域中模拟三维问题的难度，对准确和完整的材料特性的需求以及在湿热包络模型中需要包括所有相关的传输现象（如空气传输）以提高仿真结果的准确性。 （摘要由UMI缩短。）

著录项

  • 作者

    Teasdale St-Hilaire, Anik.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 359 p.
  • 总页数 359
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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