建筑全性能仿真平台用多孔材料湿物性参数测试方法与国际实验室比对分析

Analysis of Test Methods and Round Robin Campaign on Hygric Properties of Porous Materials for Building Simulation Software

建筑材料的湿物理性质是建筑全性能仿真平台分析围护结构热湿过程及建筑热湿环境必不可少的基本参数,其准确性也将直接影响仿真计算最终结果的可靠性。目前,国内外相关研究机构在湿物性测试方法及测试结果等方面仍存在一定差异。为了验证建筑全性能仿真平台用多孔材料湿物性参数的测试方法科学性和测试结果的准确性,提高国际实验室间测试结果的重复性,最终保障仿真平台用基础数据的可比性,课题研究组参与了由比利时荷语鲁汶大学组织的中欧九国湿物性参数测试比对项目,对统一发放的试样进行了真空饱和试验、毛细吸水试验和蒸气渗透试验。测试共分为自选方法测试与规定方法两阶段的测试。比对表明仿真平台用热湿物性数据的测试方法科学,结果具有较好的准确性与重复性。同时也发现,在比对项目第一阶段中真空饱和试验得出的结果最为一致,而蒸气渗透试验产生的偏差最大,其主要原因可能是样品密封和实验湿度控制对实验的影响。

Material properties are crucial input parameters for the analysis of heat,air and moisture transfer phenomena in built environment.The accuracy of hygric properties of porous building materials in the simulation software will directly affect the reliability of final simulation results.At present,domestic and foreign research institutions still have some differences in the methods and results of hygric properties test.Therefore,after analyzing the test methods of hygric properties and the reproducibility of test results,the research group participated in a round robin campaign on the hygric properties of porous building materials.A relatively stable and homogeneous ceramic brick was tested,followed by 3 standard tests including the vacuum saturation test,the capillary absorption test and the cup test.During the campaign,two rounds of measurements were performed.In the 1 st round,tests were performed according to the experimental protocols of participants.Next,a strict and detailed common protocol was formulated.The vacuum saturation test produced the most consistent results.The cup test produced the largest discrepancies,most of which might originate from sample sealing and humidity control.