粉煤灰加气混凝土墙体表面传热传质系数实验研究  

Experiment Study on Surface Heat and Mass Transfer Coefficients of Fly Ash Aerated Concrete Wall

作　　者：翁文兵[1] 田琼洁[1] 

机构地区：[1]上海理工大学,上海200093

出　　处：《建筑科学》2013年第4期36-40,48,共5页Building Science

摘　　要：本文以粉煤灰加气混凝土墙体试样作为研究对象,在室内环境温度25℃、相对湿度50%和环境温度突变至6.6℃,而后再次稳定在温度25℃、相对湿度50%2个阶段分别测得试样表面平均温度、总重变化和内部含湿量分布,分析得出实际墙体内部热湿传递特性。结果表明:经过温度突变,第2阶段表面平均温度达到稳定的时间比第1阶段多12 h,且稳定后的温度比第1阶段低0.7℃;内部水分的迁移呈现出由内自外的过程;计算得到试样表面的平均传热系数为3.46 W/(m2.K),平均传质系数为0.002 m/s。实验结果对建筑热湿负荷特性的进一步研究提供了基础性数据参考。In this paper,taking the fly ash aerated concrete wall sample as the research object,its surface temperature,total weight change and inside moisture content distribution were measured Under two test stages. For the first stage, indoor air was kept at 25 ℃ and 50% RH,while for the second one,the ambient air temperature was suddently lowered to 6 ℃ and retured to steady condition of 25℃ and 50% RH again. The results indicated that the period of the second stage was 12 h longer than the first one for achiving steady sample surface temperature, and the steady temperature was 0.7 ℃ lower than the first one. Furthermore, the process of internal moisture migration was from inside to outside,and the surface heat and mass transfer coefficients were of 3.46 W/（ m2·K） and 0. 002 m/s,respectivley. To sum up, experiment results provided basic data reference for further study of building heat and moisture load characteristics.

关 键 词：粉煤灰加气混凝土 表面平均温度 含湿量 传热系数 传质系数 

分 类 号：TU111.24[建筑科学—建筑理论]