TY - JOUR
T1 - A holistic environmental and economic design optimization of low carbon buildings considering climate change and confounding factors
AU - Ansah, Mark Kyeredey
AU - Chen, Xi
AU - Yang, Hongxing
N1 - Funding Information:
The work described in this paper was supported by the PhD studentship from the Research Institute for Sustainable Urban Development (RISUD) of The Hong Kong Polytechnic University.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/5/15
Y1 - 2022/5/15
N2 - The low carbon building design has become critical given the urgent need to reduce global carbon emissions. Reducing operational energy use through multi-objective optimizations used to be a common approach, but its validity is impaired by surging embodied impacts. Therefore, a life cycle optimization becomes necessary to improve the overall carbon performance of buildings. However, current research lacks an application of multi-objective optimizations to explore the energy use, carbon emission and cost considering both embodied and operational impacts. Impacts of confounding design factors and climate change on achieving low carbon designs are also not sufficiently revealed by existing studies. To address these gaps, this study: (i) proposes a parametric design optimization method for low carbon buildings considering cost-effectiveness, (ii) explores the impacts of confounding factors on achieving low carbon designs and (iii) evaluates the impact of climate change on the life cycle performance of buildings with proper scenario assumptions. A case study is conducted to explore passive design parameters and integrated photovoltaic (PV) applications to reduce the energy use and carbon emissions in a cost-effective approach. The joint optimization of embodied and operational impacts can reduce the energy use, carbon emission and cost by 42%, 58% and 32%, respectively. Also, variation of confounding factors can lead to different optimized designs with carbon reduction difference up to 75%. The results also show that global warming will lead to higher energy use and carbon emissions in tropical regions within the near future, while stringent mitigation strategies aligned with RCP 2.6 can reverse the trend after two decades.
AB - The low carbon building design has become critical given the urgent need to reduce global carbon emissions. Reducing operational energy use through multi-objective optimizations used to be a common approach, but its validity is impaired by surging embodied impacts. Therefore, a life cycle optimization becomes necessary to improve the overall carbon performance of buildings. However, current research lacks an application of multi-objective optimizations to explore the energy use, carbon emission and cost considering both embodied and operational impacts. Impacts of confounding design factors and climate change on achieving low carbon designs are also not sufficiently revealed by existing studies. To address these gaps, this study: (i) proposes a parametric design optimization method for low carbon buildings considering cost-effectiveness, (ii) explores the impacts of confounding factors on achieving low carbon designs and (iii) evaluates the impact of climate change on the life cycle performance of buildings with proper scenario assumptions. A case study is conducted to explore passive design parameters and integrated photovoltaic (PV) applications to reduce the energy use and carbon emissions in a cost-effective approach. The joint optimization of embodied and operational impacts can reduce the energy use, carbon emission and cost by 42%, 58% and 32%, respectively. Also, variation of confounding factors can lead to different optimized designs with carbon reduction difference up to 75%. The results also show that global warming will lead to higher energy use and carbon emissions in tropical regions within the near future, while stringent mitigation strategies aligned with RCP 2.6 can reverse the trend after two decades.
KW - Confounding factors
KW - Cumulative energy demand
KW - Global warming potential
KW - Life cycle assessment
KW - Low carbon design
UR - http://www.scopus.com/inward/record.url?scp=85123985306&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2022.153442
DO - 10.1016/j.scitotenv.2022.153442
M3 - Journal article
C2 - 35092783
AN - SCOPUS:85123985306
SN - 0048-9697
VL - 821
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 153442
ER -