双辐射作用下工业热厂房外墙传热实验研究

Experimental Study on the Heat Transfer of Industrial Plant's Exterior Wall under the Action of Bidirectional Radiation

为了研究在太阳和内热源的双向辐射作用下自然通风工业热厂房夏季外墙传热过程,搭建了实验模型,在西安夏季室外条件下对室内外参数进行了测试,并对不同余热强度工况时南墙内外壁面边界热流进行了计算和对比分析。结果表明:室内强热源影响墙体内外壁面边界上辐射热流和对流热流的大小和方向。内热源的辐射作用在余热强度大于50W/m3的情况下会对外墙传热过程会造成较大影响。白天有太阳辐射时,外壁面上的辐射散热热流会高于对流散热热流,并且余热强度对辐射对流比影响很小。夜间外壁面上的辐射对流比会随着余热强度的增大而减小,当余热强度大于200W/m3时趋于稳定。

In order to study the heat transfer of exterior wall of industrial thermal plant building with natural ventilation under the action of bidirectional radiation from the sun and the internal heat source in summer, an experimental model has been set up. The indoor and outdoor parameters has been tested under the condition of Xi＇an in summer, and the heat flux on the inside and outside boundaries of the south wall has been calculated and analyzed. The results show that the internal heat source affects the magnitude and direction of the radiant heat flux and convection heat flux. If the residual heat intensity is greater than 50W/m3, the radiation effects of heat source will cause great influence on the heat transfer of the external wall. During the day, the radiant heat flux on the outside boundary of the wall is greater than the convection heat flux, and the effects of residual heat intensity on the ratio between them is very small. At night, the ratio between radiant and convection on the outside boundary of the wall decreases with the residual heat intensity increasing and tends to be stable when the residual heat intensity is greater than 200W/m3.