围护结构太阳辐射吸收系数对太阳能采暖建筑外墙热性能的影响

INFLUENCE OF SOLAR ABSORPTIVITY OF BUILDING ENVELOPE ON THERMAL PERFORMANCE OF EXTERIORWALL OF SOLAR HEATING BUILDING

利用墙体热工系统理论,依据墙体传热的室外边界条件具有地区差异和表面特性差异的特点,选取拉萨、银川和西安作为代表性地区,通过以附加热阻百分率和附加热惰性指标为外墙表面热工参数的等效计算方法,讨论冬季采暖条件下改变太阳辐射吸收系数对南墙节能量和内壁面温度的变化规律。结果表明:增大南墙的太阳辐射吸收系数可有效增大节能量,但会小幅降低内壁面温度的稳定性,这种影响在太阳辐照度最高的拉萨地区最为显著,其次为银川和西安,且随着墙体传热阻和热惰性指标的增大,节能量和内壁面波动幅度对太阳辐射吸收系数的敏感性变小。

Using the theory of wall thermal system,according to the characteristics of regional differences and surface characteristics differences in the outdoor boundary conditions of wall heat transfer,Lhasa,Yinchuan and Xi’an were selected as representative areas.The equivalent calculation method of the thermal parameters of the outer wall surface was discussed,and the influencing law of the solar radiation absorption coefficient on the energy saving of the south wall and the temperature of the inner wall surface under the heating condition in winter was discussed.The results show that increasing the solar absorptivity of the south wall can effectively increase the energy saving,but it will reduce the stability of the inner wall surface temperature and the fluctuation range of the inner wall surface temperature.This effect is most significant in the Lhasa area with the highest solar radiation intensity,followed by Yinchuan,followed by Xi’an,and with the increase of wall heat transfer resistance and thermal inertia index,the sensitivity of energy saving and inner wall fluctuation to solar absorptivity becomes smaller.