Several common residential building external wall thermal insulation structure in Zhangjiakou for example is took, analysised insulation materials life cycle cost of residential building external wall adopted heating degree day and present value of annuity. It is concluded that the wall heat transfer coefficient is the main factors of economic thickness of insulation material. Analysis results showed that: when the life cycle cost of the wall is low, the wall economic heat transfer coefficient is same, no matter what kind of insulation materials and primary wall. Then the economical thickness of insulating material can be calculated. The wall heat transfer coefficient of Zhangjiakou area economy is between 0. 3— 0. 4 W/(m2· K).%以张家口地区常见的几种居住建筑外墙保温构造为例,采用采暖度日数并结合年金现值的方法对张家口的居住建筑外墙的保温材料生命周期内的总费用进行分析.得出墙体传热系数是决定保温材料经济厚度的主要因素.分析结果表明:墙体无论采用哪种基层和保温材料,其生命周期内费用低时,墙体经济传热系数相同,进而可以计算出保温材料的经济厚度.张家口地区墙体经济传热系数在0.3-0.4 W/(m2·K)之间.
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