摘要
外保温系统保护层的耐久性能与其热湿状况密切相关,研究分析保护层湿分传递过程及控制指标对保证近零能耗建筑外保温系统的工程质量和耐久性至关重要。目前我国现有外保温系统相关标准规范中主要湿特性控制指标之间理论科学性较差,缺少液态水迁移控制指标和限值要求,这不利于外保温系统的质量控制、优化和热湿耦合计算分析。本文提出了保护层液态水迁移分项控制指标吸水系数Acap和水蒸气迁移分项控制指标等效蒸汽渗透阻Sd值,以及基于气液两相湿迁移的综合控制指标保护系数CRP作为外保温系统保护层湿特性控制指标。在此基础上,借鉴国际材料性能要求,对我国近零能耗外保温系统保护层的湿性能控制指标给出了建议参考值。
The performance of the protecting coat of the external thermal insulation system is closely related to its hygrothermal condition. It is very important to study the moisture transfer process and control indexes of the protecting coat to ensure the engineering quality and durability of the external thermal insulation system. At present,the main moisture performance control indexes are unscientific in current specifications for external thermal insulation system in China. Liquid transfer control indexes and limits were not proposed in our specifications,either. This is not conducive to quality control,optimization,hygrothermal simulation and analysis of the external thermal insulation system. On the basis of the external thermal insulation system,the moisture performance control indexes of the protecting coat were proposed in this paper,such as the liquid transfer control index of the protecting coat( Acap),the vapor transfer control index( Sdvalue) and the comprehensive control index based on the liquid and vapor transfer( CRP). At last,the limit of the moisture performance control indexes of the protecting coat in China was given,according to the climate conditions and material characteristics in the country.
作者
孙立新
李艳娟
SUN Lixin;LI Yanjuan(China Academy of Building Research,Beijing 100013,China)
出处
《建筑科学》
CSCD
北大核心
2019年第10期24-28,共5页
Building Science
基金
“十三五”国家重点研发计划项目(2017YFC0702601-02)
国家自然科学基金青年科学基金项目(51708531)
关键词
保护层
控制指标
湿
近零能耗建筑
protecting coat
control index
moisture
nearly zero energy building(NZEB)
