建筑围护结构建造过程能源消耗火用分析评价

Exergy Assessment of the Energy Consumption of Building Envelope Construction

建筑围护结构所需的建材从生产制造阶段、运输阶段到现场施工建造阶段都将消耗大量的能源,针对这3个阶段,提出了围护结构建造过程能耗及火用耗的计算方法,并提出火用能比的概念用来评价建筑能源利用的可持续性.以湖南地区某研发中心为研究对象,对其围护结构建造过程能耗进行定量分析,结果表明:围护结构建造过程能耗主要来自于建材生产阶段,其中混凝土及其砌块单位建筑面积生产能耗最大,约占整个生产阶段能耗的44%,其次为钢材,占比约41%;钢材单位建筑面积生产火用耗最大,达到整个生产阶段火用耗的48%左右,混凝土及其砌块占比38%左右.从火用能比角度分析,钢材最大,为0.92,水泥最小,为0.59.整个围护结构建造过程火用能比为0.79.结果可为研究'烂尾楼'能耗现状提供参考.提出的火用分析评价方法可以应用于其他类似建筑,并为围护结构可持续建造提供参考.

The manufacturing stage, transport stage and on-site construction stage of building materi- als consume large amount of energy. Based on the three stages, the calculation method for energy and ex- ergy consumption was presented, and the concept of exergy-energy ratio was proposed to evaluate the sus- tainability of building energy use. A case of a research and development center located in Hunan was ana- lyzed. The results have shown that the energy consumption of building envelope construction mainly comes from the manufacturing stage of building materials. Unit building area energy consumed by concrete and steel accounted respectively for about 44% and 41% of the total energy consumption of building materials production. Unit building area exergy consumed by concrete and steel accounted respectively for about 38% and 48% of the total exergy consumption of building materials production. From the perspective ofexergy-energy ratio, the maximum value is steel, 0.92~ and the minimum is cement, 0.59. The exergy-en- ergy ratio of building envelope construction is 0.79. The results can provide reference for the research of energy consumption resulting from ＂uncompleted building＂. The exergy assessment method presented can be applied to other similar buildings, and can provide reference for sustainable building construction.