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Comparative assessment of life cycle impacts of curtain wall mullions

机译：幕墙竖框对生命周期影响的比较评估

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摘要

Glass curtain wall (CW) systems have been inevitable elements of commercial buildings for over a century. The systems mainly consist of mullion materials and glazing units that are selected and designed to achieve the desired structural, thermal and daylighting performances as well as to meet cost and aesthetic concerns. The health and environmental life cycle impacts of CW systems, however, are not usually considered in design. The main objective of this paper is to study how change of mullion materials would affect the health and environmental impacts associated with a typical CW system over its life cycle. The mullion materials studied for the purpose of this paper include extruded aluminum, carbon steel and glulam timber. Also, the health and environmental impact categories of interest include global warming, acidification, eutrophication and human toxicity. To achieve the objective, a process-based cradle-to-gate attributional Life Cycle Assessment (LCA) method was applied. Results indicate that CW system with glulam timber mullions causes the least and CW system with extruded aluminum mullions causes the most damage to the environment and human health over their life cycle. A CW system with carbon steel mullions falls in-between.
机译：玻璃幕墙（CW）系统已成为商业建筑的一个世纪以来不可或缺的元素。该系统主要由竖框材料和玻璃窗单元组成，这些竖框材料和玻璃窗单元经过选择和设计，以实现所需的结构，热和采光性能，并满足成本和美学要求。但是，在设计中通常不会考虑CW系统对健康和环境生命周期的影响。本文的主要目的是研究竖框材料的变化将如何影响典型CW系统在其生命周期中对健康和环境的影响。本文研究的竖框材料包括挤压铝，碳钢和胶合木。此外，关注的健康和环境影响类别包括全球变暖，酸化，富营养化和人类毒性。为了实现此目标，应用了基于过程的从摇篮到大门的生命周期评估（LCA）方法。结果表明，含胶合木竖框的连续波系统对生命周期的危害最小，而含铝制竖框的连续波系统对环境和人类健康的危害最大。带有碳钢竖框的连续波系统介于两者之间。

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