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Absolute sustainability of New Zealand office buildings in the context of climate targets
Building and Environment ( IF 7.4 ) Pub Date : 2021-07-30 , DOI: 10.1016/j.buildenv.2021.108186
L. Bullen 1, 2 , S.J. McLaren 1, 2 , D. Dowdell 1, 3 , C. Chandrakumar 1, 2
Affiliation  

An LCA-based absolute environmental sustainability approach was used to assess the performance of New Zealand office buildings in the context of climate targets for the period 2018–2050. It was found that the carbon footprint of the New Zealand office building sector for 2018–2050 (8566 ktCO2eq) exceeded the carbon budget (2140 ktCO2eq) by a factor of 4.0. The new build stock contributed approximately 55 % of the total office building sector carbon footprint. Operational energy use accounted for 86 % and 36 % of the existing and new build stock carbon footprints, respectively. Raw material supply, construction and manufacture contribute 53 % of the new build stock carbon footprint. For an individual new build office over a 60-year service life, the carbon footprint (1259 tCO2eq) exceeded the carbon budget (236 tCO2eq) by a factor of 5.3.

A sensitivity analysis of the results to various input parameters was undertaken. It was found that methodological choices can significantly increase or decrease the available carbon budget and the carbon footprint. The use of alternative global climate targets or grandfathering years, inclusion of mechanical, electrical and plumbing (MEP) and tenant improvement (TI) elements, and providing an alternative post-2050 use stage carbon budget for a new build office resulted in a >25 % change compared to the base case.

The study highlighted the need for more accurate assessment of MEP and TI elements in New Zealand office buildings, and up-to-date and accurate multi-regional input-output consumption-based GHG emission data for New Zealand.



中文翻译:

气候目标背景下新西兰办公楼的绝对可持续性

基于 LCA 的绝对环境可持续性方法被用来评估新西兰办公楼在 2018-2050 年气候目标背景下的表现。结果表明,新西兰办公楼行业 2018-2050 年的碳足迹 (8566 ktCO 2eq ) 超出碳预算 (2140 ktCO 2eq ) 4.0 倍。新建筑存量约占办公楼行业碳足迹总量的 55%。运营能源使用分别占现有和新建库存碳足迹的 86% 和 36%。原材料供应、建筑和制造占新建库存碳足迹的 53%。对于使用寿命超过 60 年的单个新建办公室,碳足迹 (1259 tCO2eq ) 超过碳预算 (236 tCO 2eq ) 5.3 倍。

对各种输入参数的结果进行了敏感性分析。发现方法选择可以显着增加或减少可用碳预算和碳足迹。使用替代的全球气候目标或祖父年份,包括机械、电气和管道 (MEP) 和租户改进 (TI) 元素,并为新建办公室提供替代的 2050 年后使用阶段碳预算导致 >25与基本情况相比的百分比变化。

该研究强调需要更准确地评估新西兰办公楼中的 MEP 和 TI 元素,以及新西兰最新、准确的基于多区域投入产出消费的温室气体排放数据。

更新日期:2021-08-11
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