建筑节能,不外乎从两方面着手:一是节流;二是开源。节流和开源是相辅相成的两个方面,既不可分割,也不可偏废。我国建筑能耗严重浪费的主要原因,就是房屋外围护结构的绝热性能太差。每平方米建筑面积的年采暖能耗相当于发达国家的2～3倍。在投资增加5%～10%的情况下,降低能耗20%～ Building energy efficiency is nothing more than two aspects: one is to save money; the other is to open source. Savings and open source are two aspects that complement each other. They are indivisible and cannot be neglected. The main reason for the serious waste of building energy in China is the poor thermal insulation performance of the external protective structure of the house. The annual heating energy consumption per square meter of building area is equivalent to 2 to 3 times that of developed countries. When the investment increases by 5% to 10%, the energy consumption is reduced by 20%~