混凝土砌块墙体检测中的几个问题

Some Problems on Inspection of Concrete Block Wall

墙体主体传热系数通常使用热流计进行测量。本文分析了热流计的使用条件,提出对于砌块墙体等表面温度分布不均匀的墙体,不适宜使用热流计测量其主体传热系数的观点。而后以混凝土砌块墙体为例,分别模拟了不同室外温度时,不保温、外保温和内保温3种情况下,墙体内外表面温度分布的情况,并针对保温墙体改变其保温层厚度,得出墙体内外表面温度及温差变化的趋势,进而得到应将热流计粘贴在保温层一侧对保温墙体进行检测的结论。模拟结果还显示,当室外温度大于0℃时,对于保温层厚度大于70 mm的内保温墙体,也可将热流计贴在不保温的一侧进行检测。

Heat transfer coefficient of main body of wall is usually inspected by heat flow meter. In this paper, the condition of using heat flow meter was analyzed, and it was pointed out that it was unsuitable to inspect wall of non-uniform surface temperature distribution with heat flow meter, such as concrete block wall. And then, taking concrete block wall as an example, the temperature distributions of both internal and external surfaces under different outdoor temperatures were simulated. The simulation was under the following three conditions： with no insulation, external insulation and internal insulation. For the insulated walls, insulation thickness was changed gradually, so that the surface temperature and temperature difference of both sides were simulated. Thus the conclusion, heat flow meter should be put on the insulated side was drawn. Furthermore, the simulation results indicated that when the outdoor temperature was above 0 ℃, for internal wall with more than 70 mm insulation,it was also feasible to put heat flow meter on the non-insulated side.