保温形式对建筑南墙冬季吸收太阳辐射的影响

Impacts of insulation methods on absorption of solar radiation by building south walls in winter

以上海市冬季典型日的气候条件为背景,利用数值模拟方法研究了建筑南墙在太阳辐射作用下的动态传热过程,分析了不同保温形式在不同室内外气温下对南墙全天太阳辐射实际吸收效果的影响。结果表明,南墙全天太阳辐射净得热量随室外气温的升高而增大,随室内气温的升高而减小,内保温墙体昼间得热总量和夜间散热总量均高于外保温墙体,其全天太阳辐射净得热量比外保温墙体高51%~63%,且室外气温越高,室内气温越低,内保温墙体吸收太阳能的优势更加显著,其太阳能实际吸收率最高可达47.8%,而外保温墙体最高只有24.1%,因此,对冬季室外气温较高,采用间歇供暖方式的地区,墙体采用内保温方式更有利于减小采暖能耗。

The heat transfer process of the building south walls under solar radiation was simulated by numerical method in Shanghai area.The effects of different insulation methods on the real absorption of solar radiation by south walls were analyzed when the indoor and outdoor air temperature varied.The results show that the net solar heat gain of the south walls increases with the outdoor air temperature increasing,and decreases with the indoor air temperature increasing.The total heat gain of internal insulation walls during daytime and the total heat dissipation at night are also much higher than that of external insulation,and its net heat gaining from solar radiation is 51%~63%higher than that of external insulation,also the lower indoor air temperature and the higher outdoor air temperature is,the more remarkable the solar energy absorbing advantage of the internal insulation will be,the highest solar absorption rate of internal insulation wall is 47.8%but only 24.1%about external insulation.Therefore,for the region where the outdoor air temperature is higher and the intermittent heating system is used in winter,the heating energy consumption of building can be reduced more effectively by internal insulation walls instead of external insulation.