基于LCA理论的保温材料对建筑能耗及回收期的影响分析

Analysis on the effect of LCA theory-based insulation materials on building energy consumption and payback period

通过考虑建筑的使用周期、保温层厚度和基层墙体的传热系数等因素,建立保温材料生产能耗和建筑运行能耗以及单位面积墙体总能耗计算模型,分析不同种类保温材料对总单位面积墙体总能耗的影响,进而建立最佳保温层厚度和回收期计算模型。结果表明,不同材料的总能耗不同,但是都存在一个最低能耗值,该值对应的厚度即为最佳保温层厚度。随着保温层厚度的增加,能耗回收期也逐渐延长。此外,基层墙体(未做保温层的墙体)的传热系数也影响能耗回收期,传热系数越大,能耗回收期也越长。

By considering the building life cycle, insulation thickness and base course wall heat transfer coefficient,establish computing model of building insulation materials production energy consumption, building operation energy consumption and total en- ergy consumption of per unit area of the wall,analyze the effect of different types of insulation materials on the total energy con- sumption per unit area of the wall,so as to establish the computing model of. optimal thermal insulation thickness and payback peri- od. The results show that the total energy consumption of different materials is different,but there is a minimum energy consumption value that corresponds to the optimal thickness of the insulation layer. With the increase of the insulation layer thickness,the energy paybaek period is gradually extended. In addition, base course wall（wall without making insulation layer） heat transfer coefficient also influences the energy payback period, the greater the heat transfer coefficiant, the longer the energy payback neriod.