空心砖竖向传热差异性试验研究

Experimental Study on the Heat Transfer Performance of Hollow Bricks in Vertical Arrangement

采用稳态对比法,对2种厚度、孔隙竖直的空心砖做了竖向传热对比试验.结果表明:当零温端位于试样顶部时(模式Ⅰ),试样底部(暖端)温度的初始下降速率要比零温端位于试样底部时(模式Ⅱ)其顶部(暖端)温度的初始下降速率快;当试样的内部温度场稳定以后,模式Ⅰ下的试样竖向温差要比模式Ⅱ下的温差小,并且在试样的整个降温过程中,模式Ⅰ下暖端的降温幅度要比模式Ⅱ下的大.通过近似分析表明,模式Ⅰ的空心砖传热系数是模式Ⅱ的3倍多.在多年冻土地区搞工程建设,合理利用空心砖的这种竖向传热差异性,将有利于增强下部地基的稳定性.

The heat transfer performance of hollow bricks with two kinds of thickness under the condition of vertical aperture was studied by steady comparison method. The results show： （1） for the system with the cold end being 0 ℃ 0 it is cooled more quickly when the cold end is located on the top （mode Ⅰ ） than on the bottom （mode Ⅱ ） ; （2） when the temperature region of system come to stabilization, the temperature fall of the warm end is higher for the mode I than the mode Ⅱ. At the same time, the temperature difference of the warm end for mode Ⅱ is less than mode Ⅰ. Finally, it is indicated by the approximate calculation that thermal transfer coefficient for the mode Ⅰ is 2 times higher than mode Ⅱ. If the heat transfer difference of hollow bricks can be applied, stability of the groundwork will be enhanced.