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The impact of value engineering on embodied greenhouse gas emissions in the built environment: A hybrid life cycle assessment

机译：价值工程对建筑环境中的温室气体排放的影响：混合生命周期评估

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摘要

While traditional value engineering (VE) is primarily driven by cost saving, this study aims to comprehensively and reliably investigating the impact of traditional VE on the embodied greenhouse gas (GHG) emissions in the Australian built environment. An Australian-specific hybrid life cycle assessment (LCA) is developed and applied to a mixed-use building complex located in central Sydney, Australia. A list of GHG emissions intensities (GEIs) for 118 construction products is derived from hybrid LCA, demonstrating an average increase of 20% than the corresponding process-based GEIs. By applying the hybrid GEIs, the assessment of the case study building proves that traditional VE can potentially provide environmental benefits through the dematerialisation of the building. These benefits are small in this instance, with a capital cost reduction of 0.72% equating to an embodied GHG reduction of 0.32%, or a total of 267 t CO2e (i.e. -3 kg CO2e/m2 gross floor area), but if such savings were rolled out across the entirety of new building stock in Australia, the accumulated GHG emissions reduction would be significant. Concrete, reinforcing steel and timber formwork are the hotspots for cost and embodied GHG emissions reduction. Manufacturing and electricity are the originating industries that jointly contribute to more than 80% of the embodied GHG emissions.
机译：虽然传统价值工程（VE）主要由节能成本驱动，但本研究旨在全面，可靠地调查传统对澳大利亚建造环境中体现的温室气体（GHG）排放的影响。澳大利亚特定的混合生命周期评估（LCA）是开发的，并应用于位于澳大利亚悉尼市中心的混合用途建筑群。 118个施工产品的温室气体排放强度（Geis）列表来自混合LCA，展示平均增加的20％，而不是相应的基于过程的Geis。通过申请混合动力GEIS，案例研究建设的评估证明，传统的VE可以通过建筑物的废除来提供环境效益。在这种情况下，这些益处很小，资金成本降低0.72％，等于实施的温室气体减少0.32％，或总共267吨CO2E（即-3kg CO2E / M2总建筑面积），但如果这样的节省在澳大利亚的整个新建筑股中推出，累计温室气体排放量将是显着的。混凝土，增强钢和木材模板是用于减少成本和变化的温室气体排放的热点。制造业和电力是联合贡献超过80％的体现温室气体排放的始发行业。

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