论文部分内容阅读
本文报道了用常功率平面热源法测定含湿加气混凝土砌块导热系数和导温系数的试验结果。发现实测到的总当量导热系数λ随含湿量的增加而单调地递升,名义导温系数α随含湿量的变化曲线却在低含湿量区出现明显的拐点和极小值。文中,对含湿建筑材料在温度梯度下的湿—热迁移机理作了初步探讨,并给出了一种半经验方法,提供了实用的算图(图8)和进行温度修正的式(14)和(15),可由式(13)从实测的总当量导热系数λ中扣除湿迁移影响,由此得到的真导热系数λ_0和含湿量之间呈现线性关系(图7)。
This paper reports the test results of the thermal conductivity and the coefficient of thermal conductivity of aeroampicated concrete masonry with constant power planar heat source. It is found that the measured thermal conductivity λ of the total equivalent increases monotonically with the increase of the moisture content. The curve of the nominal temperature coefficient α with moisture content shows obvious inflection points and minimum values in the low moisture content area. In this paper, the wet-heat transfer mechanism of wet building materials under temperature gradient is discussed. A semi-empirical method is given, which provides a practical calculation diagram (Figure 8) and the temperature-corrected equation ) And (15), the influence of wet migration can be deducted from the measured total equivalent thermal conductivity λ by Eq. (13), and the linear relationship between the true thermal conductivity λ_0 and the moisture content is obtained.