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A science-Based Target Approach
for Buildings: the long wait is over
Chanjief Chandrakumar New Zealand Life Cycle Management Centre, Massey University
Q1) What does LCA mean to buildings? A basis for relative - - PowerPoint PPT Presentation
Q1) What does LCA mean to buildings? A basis for relative - - PowerPoint PPT Presentation
A s cience-Based Target Approach for Buildings: the long wait is over Chanjief Chandrakumar New Zealand Life Cycle Management Centre, Massey University Q1) What does LCA mean to buildings? A basis for relative improvements Climate change
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A basis for relative improvements
Source: Russell-Smith et al., 2015
Climate change impact of building
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Q2) Are relative improvements sufficient for achieving environmental sustainability?
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a) YES b) NO c) MAYBE
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Q3) What is the SOLUTION?
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Source: Russell-Smith et al., 2015
?
Climate change impact of building
Potential Solution: Benchmarks
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Science-Based Targets
- Not straightforward for the construction sector
- Complexity of buildings, materials etc.
- Lifetime
- Benchmarks are available for both residential and commercial
buildings (Hoxha et al. 2016; Zimmerman et al. 2005)
- Estimated a share of the 2C global carbon budget (i.e. a target) for a future
building
- The existing approaches are limited
- Targets are for the whole building
- Overlook the growth in the number and size of buildings
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Our Approach for detached houses
Source: Chandrakumar et al., submitted to Building and Environment
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2°C GCB (2018-2050) NZ DH sector s share of 2°C GCB (2018-2050) LCA-based climate impacts of a NZ pre- existing detached house LCA-based climate impacts of a NZ new-built detached house
Other data Process Sub- process
Legend NZ DH sector- climate impacts projection (2018- 2050) NZ DH sector-stock projection (2018-2050) NZ Stats consensus NZ DH sector s share of 2°C GCB for pre-existing detached houses (2018-2050) NZ DH sector s share of 2°C GCB for new-built detached houses (2018-2050) NZ pre-existing detached house climate target for whole building NZ new-built detached house climate target for whole building NZ s consumption- based climate impact
Country downscaling by cumulative population
Sector downscaling by grandfathering
NZ s share of 2°C GCB (2018-2050)
Sector downscaling by grandfathering Life cycle downscaling by grandfathering Life cycle downscaling by grandfathering Upscaling based on gross floor area
NZ pre-existing detached house climate target for each life-cycle stage
Upscaling based on gross floor area
NZ new-built detached house climate target for each life-cycle stage
Source: Chandrakumar et al., submitted to Building and Environment
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Results-new built detached house
Climate impact=277 tCO2eq Requires 79% reduction Climate target=59 tCO2eq
Source: Chandrakumar et al., submitted to Building and Environment
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Conclusions
- Greater scale of change required than currently envisaged in building
design and management
- Further research:
− Update the analysis using actual carbon footprints of townhouse and apartments − Sensitivity analysis for global carbon budget, sharing principles − Scenarios for different climate zones, electricity mixes, functional units
- Potentially this approach can stimulate disruptive change in sectors by
refocusing attention on the scale of change required to limit the future impacts of climate change
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Acknowledgements
- Prof Sarah J McLaren, Dr David (Dave) Dowdell and Roman Jaques
- Building Research Association of New Zealand
- Whole Building Whole of Life Framework
- Funding
- New Zealand Life Cycle Management Centre
- Massey University