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Life cycle assessment (LCA) of double-skin fagade (DSF) system with fiber- reinforced concrete for sustainable and energy-efficient buildings in the tropics

机译:带有纤维增强混凝土的双层幕墙(DSF)系统的生命周期评估(LCA),用于热带地区的可持续建筑和节能建筑

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摘要

Building envelope governs heat transfer between the external environment and building interiors and thus greatly influences the energy demand for heating and cooling. In this study, an innovative double-skin façade (DSF) system achievable with a new concrete composite called high performance green hybrid fiber-reinforced concrete (HP-G-HyFRC) is proposed. Mechanical performance and partial life cycle assessment (LCA) focusing on embodied and operational energy was evaluated for the new system against an existing solid façade (SW) system as generally adopted in public housing in Singapore. Flexural test results showed that in addition to a 25% reduction in concrete usage and weight, the DSF system also exhibited a higher structural capacity and ductility as compared to the SW counterpart. LCA analysis of a functional unit revealed that the DSF system could potentially reduce the annual operational energy and CO2eqemission by 9.2%, despite a higher embodied energy and materials cost. Yet, the additional embodied energy and cost could be recovered within the first 2 and 8.2 years of operation, respectively. The findings demonstrate a promising potential for the application of the DSF system to reduce operational energy of buildings in the tropics.
机译:建筑围护结构控制着外部环境与建筑物内部之间的热传递,因此极大地影响了供暖和制冷的能源需求。在这项研究中,提出了一种创新的双层外墙(DSF)系统,该系统可通过一种新型的混凝土复合材料实现,该复合材料称为高性能绿色混合纤维增强混凝土(HP-G-HyFRC)。针对新系统,针对机械性能和部分生命周期评估(LCA),以新加坡公共住房中普遍采用的现有实立面(SW)系统为基础,对该新系统进行了评估。挠曲测试结果表明,与SW相比,DSF系统除了将混凝土用量和重量减少了25%外,还表现出更高的结构容量和延展性。 LCA对功能单元的分析表明,尽管体现的能源和材料成本更高,但DSF系统仍可能将年度运营能源和CO2排放量降低9.2%。但是,可以在运行的前2年和8.2年内分别收回额外的体现能源和成本。研究结果表明,利用DSF系统减少热带地区建筑物的运行能耗具有广阔的前景。

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