基于Gebhart辐射模型的建筑壁面对流辐射传热计算方法

摘要

建筑内壁面传热是一种导热、对流和辐射共存的复合传热过程,基于Gebhart辐射模型,建立建筑壁面传热同步模型,可同步计算壁面温度和空气温度,在此基础上分析建筑壁面对流辐射传热特性.研究结果表明:传热同步模型的空气温度理论计算值小于实测值,偏差均在0.25 ℃以内;壁面温度计算值与实测值的偏差基本在1℃以内.并对南墙加热壁面与地板的导热传热、对流传热及辐射传热进行分析.研究结论为进一步应用Gebhart辐射模型和研究壁面的对流辐射传热提供了参考依据.%The heat transfer on building inner surface is a complex process that combines thermal conduction,convection and radiation.A synchronization model of heat transfer was presented based on Gebhart radiant model.The model was used to calculate inner surface temperature and indoor air temperature.The characteristics of the convection and radiation heat of inner surface were then obtained.The results showed that the calculated value of indoor air temperature of the proposed model was smaller than the measured value,and the maximum deviation was less than O.25 ℃;and the temperature difference of inner surface between calculated value and tested value was no more than 1 ℃.Thus,the characteristics of thermal conduction,convection and radiation of inner surface were obtained.The results provide some important information for applying Gebhart radiant model,and for researching convection and radiation heat of inner surface.