Optimising embodied carbon and U-value in load bearing walls: A mathematical bi-objective mixed integer programming approach

被引:18
作者
Hammad, Ahmed W. A. [1 ]
Akbarnezhad, Ali [2 ]
Oldfield, Philp [1 ]
机构
[1] Univ New South Wales, Sch Built Environm, Sydney, NSW, Australia
[2] Univ Sydney, Sch Civil Engn, Sydney, NSW, Australia
关键词
Embodied carbon; U-value; Building envelope; Structural optimisation; Mixed integer programming; LIFE-CYCLE ASSESSMENT; BUILDING ENVELOPE DESIGN; IN-SITU MEASUREMENT; ENVIRONMENTAL IMPACTS; OPERATIONAL ENERGY; NOISE-POLLUTION; PERFORMANCE; OPTIMIZATION; CONSTRUCTION; EMISSIONS;
D O I
10.1016/j.enbuild.2018.05.061
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The construction and building industry is known to be a carbon intensive sector. Of the various opportunities present for minimising the carbon footprint of buildings, optimising the material selection of building components is one plausible avenue for significant carbon reductions. In the construction of opaque load-bearing walls, the thermal performance of the construction build up is the parameter that has the greatest influence over building operational carbon emissions, with thicker profile walls leading to lower U-values and hence lower operational carbon from heating and cooling. Conversely, the extra wall material contributes to increased embodied carbon. The aim of this study is to capture such tradeoff between embodied carbon and U-value by presenting a practical optimisation model to design load bearing walls in commercial and residential buildings. In particular, two objective functions are incorporated within the proposed model for the structural design and material selection of the wall layers; the first objective minimises the embodied carbon of the wall while the other minimises the U-value of the wall. The variables forming the optimisation model include the thickness of each wall layer, and the choice of material forming each layer. The proposed model is tested on a practical case example applicable in Australia and the UK, involving a load bearing wall. Results are reported in the form of a Pareto efficient frontier. Utilising the model enables the realisation of the impacts of material selection and wall layering on embodied carbon and U-value of the building structure. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:657 / 671
页数:15
相关论文
共 62 条
[1]   Estimation and minimization of embodied carbon of buildings: A review [J].
Akbarnezhad, Ali ;
Xiao, Jianzhuang .
Buildings, 2017, 7 (01)
[2]   Performance characteristics and practical applications of common building thermal insulation materials [J].
Al-Homoud, MS .
BUILDING AND ENVIRONMENT, 2005, 40 (03) :353-366
[3]  
[Anonymous], 2010, BUILDING ENVELOPE
[4]  
[Anonymous], 2011, CARB PLAN DEL OUR LO
[5]  
[Anonymous], INT PAN CLIM CHANG C
[6]  
[Anonymous], 2017, ADFORD ENVIROSEAL CO
[7]  
ASHRAE, 2001, HDB ASHRAE FUND, V111
[8]  
Australian Institute of Building, 2016, NCC NAT CONSTR COD, V1
[9]   Multi-objective optimization of building envelope design for life cycle environmental performance [J].
Azari, Rahman ;
Garshasbi, Samira ;
Amini, Pegah ;
Rashed-Ali, Hazem ;
Mohammadi, Yousef .
ENERGY AND BUILDINGS, 2016, 126 :524-534
[10]   Application of life-cycle assessment to early stage building design for reduced embodied environmental impacts [J].
Basbagill, J. ;
Flager, F. ;
Lepech, M. ;
Fischer, M. .
BUILDING AND ENVIRONMENT, 2013, 60 :81-92