Embodied Carbon & Life Cycle Considerations in Building Structures

Transcription

1 Embodied Carbon & Life Cycle Considerations in Building Structures WALSH Seminar June 7 th & 8th, 2016 Frances Yang, SE, LEED AP BD+C Structures and Materials Specialist Energy + Resources Group

2 Global Engineering Designer Multi-disciplinary services 10,000+ Employees Leader in sustainability Established Offices 33 Countries 2

3 Course Summary Embodied carbon is often neglected yet found to be critical to address for tackling climate change. Could the rise of mass timber as a construction alternative help us? Recent Arup carbon studies on the two USDA Tall Wood prize buildings offer some design and procurement lessons learned about the life cycle of wood products Learning Objectives Distinguish operational carbon from embodied carbon Identify how timber construction can be an effective strategy to lower embodied carbon Discover where the risks are to using timber as a means to lower embodied carbon Identify immediate actions designers and builders can take to producing lower carbon buildings for all types of construction 3

4 FAQ s Why care about embodied carbon? How about Timber? Is measuring Carbon enough? What can we do? 4

5 CARBON FROM BUILDINGS

6 LIFE CYCLE CARBON Embodied Operational Life-Cycle Carbon

7 LIFE CYCLE CARBON

8 Operational Carbon vs. Embodied Baseline Efficient Clean Energy Refurb Rebuild 8

9 It s the NOW that matters Illustration by Ed Nacional From book by George Monbiot Heat: How to Stop the Planet from Burning 9

10 Industry Claims Source: 10

11 CARBON OVER LIFE OF A WOOD PRODUCT Arup 11

12 LCA TOOLS AND STANDARDS Arup

13 CARBON OVER LIFE OF STRUCTURAL PRODUCTS Steel Concrete Wood Arup 13

14 CONCRETE VS. TIMBER CARBON STUDY VS. Framework, Portland 475 W 18 th St, New York 14

15 Case Study CONCRETE VS. TIMBER CARBON STUDY 475 W 18 th St, New York Gravity System Concrete Design Option Concrete flat slab Concrete columns Timber Design Option CLT floor and roof panels Glulam framing Lateral System Concrete shear walls CLT shear walls Foundations Concrete mini piles Concrete mini piles Column Grid 19 x x 12 15

16 MATERIAL QUANTITIES Cross-laminated Timber (ft 3 ) Concrete Design Option Timber Design Option 0 48,622 Glulam Sections (ft 3 ) 0 8,170 Solvent Based Varnish (gallons) Bolts, Fasteners, Clips (tons) Concrete 4000 psi (yd 3 ) 1, Concrete 6000 psi (yd 3 ) Rebar (tons) Gypsum Board (ft 2 ) 0 1,350 16

17 Global Warming Potential (kg CO2,eq) CARBON FROM WOOD ON PROJECT 2.00E E+06 Concrete Design Timber Design 1.00E E E E E E E+06 17

18 Global Warming Potential (kg CO2,eq) CARBON FROM WOOD ON PROJECT 2.00E E+06 Concrete Design Timber Design 1.00E E E E E E+06 If lower transportation emissions not achieved (New York) -2.00E+06 18

19 Global Warming Potential (kg CO2,eq) CARBON FROM WOOD ON PROJECT 2.00E E+06 Concrete Design Timber Design 1.00E E E E E E+06 If lower transportation emissions not achieved (Portland) -2.00E+06 19

20 Global Warming Potential (kg CO2,eq) CARBON FROM WOOD ON PROJECT 2.00E E+06 Concrete Design Timber Design 1.00E E E+00 If methane not captured at end-of-life -5.00E E E E+06 Concrete Design Option Timber Design Option 20

21 Global Warming Potential (kg CO2,eq) CARBON FROM WOOD ON PROJECT 2.00E E+06 Concrete Design Timber Design 1.00E E E+00 If wood not sourced from replenished harvest areas -5.00E E E E+06 Concrete Design Option Timber Design Option 21

22 Timber Strategies LESSONS FROM PROJECT CARBON STUDIES Lower Transportation Emissions Improve Beyond Building Life Source from Replenished Harvest Areas Source timber from the vicinity and/or change transport efficiency Capture methane emissions from landfill OR better Select wood from harvest areas that are unquestionably replenished Source timber with FSC, SFI, or PEFC certification 22

23 Timber Strategies LESSONS FROM PROJECT CARBON STUDIES Lower Transportation Emissions Improve Beyond Building Life Source from Replenished Harvest Areas Source timber from the vicinity and/or change transport efficiency Capture methane emissions from landfill OR better Select wood from harvest areas that are unquestionably replenished Source timber with FSC, SFI, or PEFC certification 23

24 WASTE HIERARCHY Waste Prevention Reuse Recycle Energy Recovery Disposal Arup 24

25 Timber Strategies LESSONS FROM PROJECT CARBON STUDIES Lower Transportation Emissions Improve Beyond Building Life Source from Replenished Harvest Areas Source timber from the vicinity and/or change transport efficiency Capture methane emissions from landfill OR better Select wood from harvest areas that are unquestionably replenished Source timber with FSC, SFI, or PEFC certification 25

26 Summary: Timber design options must ensure appropriate strategies are implemented for proper comparison Further Study: Explore concrete strategies (i.e., high and low cement mix options) compared to timber strategies Include operational carbon to improve context of structural results 26

27 Bigger Picture Stewardship Full Life Cycle Assessment Total Life-cycle Carbon 27

28 28 Comparative LCA of Glulam vs. Steel Raleigh-Durham Airport T2 Roof Truss Athena Impact Estimator s Bill of Materials + Transport

29 Multiple Impact Categories Using Glulam instead of Steel Key Performance Indicator Reduction Energy Consumption 85% Global Warming Potential 86% Acidification Potential 48% HH Respiratory Effects Potential 61% Eutrophication Potential 99% Ozone Depletion Potential (23%) Due to formaldehydebased adhesives in GLB. (Now CLT using PUR-based adhesives.) 29

30 Life-Cycle Carbon of Façade Options PV Laminate Bio-based Facade + 25yrs Grid Electricity Image courtesy of wd Partners

31 Payback on Initial Environmental Burden

32 Life-cycle Impacts of Façade Options 100% 80% 60% 40% 20% 0% PV Laminate Bio-based facade + 25yrs Grid Power

33 RESPONSIBLE FOREST MANAGEMENT FSC vs. SFI +Land use +Habitat +Biodiversity +Fair Labor +Indigenous Peoples Rights +Local Economies 33

34 ECOSYSTEM SERVICES Source: freshwaterwatch.thewaterhub.org

35 LOW CARBON + STEWARDSHIP Framework, Portland

36 LOW CARBON + STEWARDSHIP 475 W 18 th St, New York

37 INNOVATION ADOPTION CURVE

38 Image Source:

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40 2016 KIERANTIMBERLAKE

41 INFORM DESIGN 2016 KIERANTIMBERLAKE

42 LEED GREEN BUILDING STANDARD

43 LIVING BUILDING CHALLENGE

44 OTHER RATING SYSTEMS AND STANDARDS

45 45?

46 Embodied Carbon and Energy Database 400 Embodied CO 2 in Superstructure per m Range London Projects 46

47 DRIVE DOWN THE BENCHMARK

48 Embodied Carbon & Embodied Energy Sort by: Area Storeys Avg Floor Height Use Type Region Structure Type Etc 48

49 ARCHITECTURE 2030 CHALLENGE Products Projects Watch this space!

50 WOOD IS THE A SOLUTION low carbon + health + stewardship Framework, Portland LEVER

51 QUESTIONS?