Abstract
This paper studies the law of capillary water rise in the brick solid wall and the brick cavity wall under the influence of high-humidity wall foundation. It is found that the rising height of the capillary water sharp front is proportional to the time to the 0.5 power, but the coefficient is related to the wall structure, and the speed in cavity wall is higher than that in the solid wall. The heat flow meter method was used to compare the influence of the capillary water to the heat transfer when it rises to different heights. It is found that the presence of capillary water has a direct impact on the heat transfer coefficient of the wall. The presence of capillary water may increase the heating load by 11.1% and the cooling load by 15% of a common historical building in hot summer and cold winter area of China.
Highlights
From the Ming Dynasty to the present, a large number of historical brick buildings have been preserved, such as China's Forbidden City and the ancient city of Pingyao
The cavity wall is different from the solid wall regarding masonry method, the rising of the sharp front in the cavity wall is expressed by the law h(t) =
After hour 1200, when sharp front just reaches P2, the K value of P1 increased to 4.45 W/m2·k, the K value of P2 increased to 2.62 W/m2·k, the K value of P3 decreased 0.08 W/m2·k
Summary
From the Ming Dynasty to the present, a large number of historical brick buildings have been preserved, such as China's Forbidden City and the ancient city of Pingyao. Many of these buildings are still being used. Most of these historical buildings have only one or two floors. In the rainy season or in the shallow groundwater level area, the wall base of ground floor is affected by rainwater, surrounding high-humidity soil, or dynamic underground water. From 1977 to 1995, a series of papers were published to provide a systematic introduction to water movement in porous building materials.
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