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Refurbishment of office buildings in New Zealand: identifying priorities for reducing environmental impacts

  • Agneta GhoseEmail author
  • Massimo Pizzol
  • Sarah J. McLaren
  • Mathieu Vignes
  • David Dowdell
PACKAGING SYSTEMS INCLUDING RECYCLING
  • 149 Downloads

Abstract

Purpose

In recent years, the building sector has highlighted the importance of operational energy and efficient resource management in order to reduce the environmental impacts of buildings. However, differences in building-specific properties (building location, size, construction material, etc.) pose a major challenge in development of generic policy on buildings. The aim of this study was to investigate the relationship between energy and resource management policies, and building-specific characteristics on environmental impacts of refurbished office buildings in New Zealand.

Methods

Life Cycle Assessment (LCA) was performed for 17 office buildings operating under seven representative climatic conditions found in New Zealand. Each building was assessed under four policy scenarios: (i) business-as-usual, (ii) use of on-site photovoltaic (PV) panels, (iii) electricity supply from a renewable energy grid, and (iv) best practice construction activities adopted at site. The influence of 15 building-specific characteristics in combination with each scenario was evaluated. The study adopted regression analysis, more specifically Kruskal-Wallis and General Additive Modeling (GAM), to support interpretation of the LCA results.

Results and discussion

All the chosen policies can significantly contribute to climate change mitigation as compared to business-as-usual. However, the Kruskal-Wallis results highlight policies on increasing renewable energy sources supplying national grid electricity can substantially reduce the impacts across most environmental impact categories. Better construction practices should be prioritized over PV installation as use of on-site PV significantly increases the environmental impacts related to use of resources. The GAM results show on-site PV could be installed in low-rise buildings in regions with long sunshine hours. The results also show the strong influence of façade elements and technical equipment in determining the environmental performance of small and large buildings, respectively. In large multi-storied buildings, efficient HVAC and smaller window area are beneficial features, while in small buildings the choice of façade materials with low embodied impacts should be prioritized.

Conclusions

In general, the study highlighted the importance of policies on increasing renewable energy supply from national grid electricity to substantially reduce most of the impacts related to buildings. In addition, the study also highlighted the importance of better construction practices and building-specific characteristics to reduce the impacts related to resource use. These findings can support policy makers to prioritize strategies to improve the environmental performance of existing buildings in New Zealand and in regions with similar building construction and climate.

Keywords

Building refurbishment Construction Deep retrofit Energy efficiency General additive model Life Cycle Assessment Kruskal-Wallis Photovoltaic Policy making Regression analysis Resource management 

Notes

Funding information

This study was financially supported by the Building Research Levy, through BRANZ Inc., New Zealand Life Cycle Management Centre and Massey University Dissemination Grant.

Supplementary material

11367_2018_1570_MOESM1_ESM.docx (41 kb)
ESM 1 (DOCX 40 kb)
11367_2018_1570_MOESM2_ESM.docx (40 kb)
ESM 2 (DOCX 40 kb)
11367_2018_1570_MOESM3_ESM.docx (53 kb)
ESM 3 (DOCX 52 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Agriculture and EnvironmentMassey UniversityPalmerston NorthNew Zealand
  2. 2.Building Research Association of New ZealandPorirua CityNew Zealand
  3. 3.Department of PlanningAalborg UniversityAalborgDenmark
  4. 4.Institute of Fundamental SciencesMassey UniversityPalmerston NorthNew Zealand

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