Coordinated energy-environmental-economic optimisation of building retrofits for optimal energy performance on a macro-scale: A life-cycle cost-based evaluation

Hong, Y.; Ezeh, Collins I.; Deng, W.; Hong, S-H.; Ma, Y.; Tang, Y.; Jin, Y.

Abstract

Given that energy-efficiency policies focus on meso- or macro-scale interventions, it is imperative to establish a macro-scale evaluation approach for building retrofits to support policymaking in building energy conservation, management and sustainability. This study applies the generic idea of optimising the energy, economic and environmental outputs to propose a facile framework for evaluating the prospects of building retrofits on a macro-scale. Here, an extensive optimisation approach integrating life cycle cost evaluation and an environmental assessment is formulated, involving coordinated on-site survey, modelling and data analytics. The model framework is corroborated by a case study analysis focused on identifying the optimal retrofit solution for low-rise office buildings in Shanghai. Simulation results show that modifications in occupancy regime, improvements in natural ventilation, heating and cooling systems, cool roofs insulation and installation of renewable energy systems (such as geothermal and solar/photovoltaics) are the basic retrofit measures for a macro-scale intervention to attain maximum life-cycle benefits. Individually, an estimated investment cost for each retrofit project varied within RMB 1 – 5 million with a payback period ≤13 years, depending on the building characteristics. Overall, an investment estimated at RMB 1.7 billion (with a payback period of 6 years) is required to achieve ~ 80% energy reduction with a carbon dioxide savings of ~ 243 Gg-CO2/yr. In summary, this study provides a guidance framework for stakeholders to evaluate investments on retrofit projects, including existing and prospective ones.

Citation

Hong, Y., Ezeh, C. I., Deng, W., Hong, S.-H., Ma, Y., Tang, Y., & Jin, Y. (2021). Coordinated energy-environmental-economic optimisation of building retrofits for optimal energy performance on a macro-scale: A life-cycle cost-based evaluation. Energy Conversion and Management, 243, Article 114327. https://doi.org/10.1016/j.enconman.2021.114327

• Journal Article Type: Article
• Acceptance Date: May 22, 2021
• Online Publication Date: Jun 3, 2021
• Publication Date: Sep 1, 2021
• Deposit Date: Jun 4, 2021
• Publicly Available Date: Jun 4, 2022
• Journal: Energy Conversion and Management
• Print ISSN: 0196-8904
• Electronic ISSN: 2590-1745
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 243
• Article Number: 114327
• DOI: https://doi.org/10.1016/j.enconman.2021.114327
• Keywords: Fuel Technology; Renewable Energy, Sustainability and the Environment; Energy Engineering and Power Technology; Nuclear Energy and Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/5625926
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S0196890421005033?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Coordinated energy-environmental-economic optimisation of building retrofits for optimal energy performance on a macro-scale: A life-cycle cost-based evaluation; Journal Title: Energy Conversion and Management; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.enconman.2021.114327; Content Type: article; Copyright: © 2021 Elsevier Ltd. All rights reserved.