Design for Sustainability - MIT OpenCourseWare...CaSO4 + 2H2O) 120-180 oC 240-600 oC Anhydrit rock...
Transcript of Design for Sustainability - MIT OpenCourseWare...CaSO4 + 2H2O) 120-180 oC 240-600 oC Anhydrit rock...
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Design for SustainabilityIntroduction to Life Cycle Assessment
Dana OzikOctober 4, 2006
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What is Sustainable Development?
• Original definition:“Sustainable development meets the needs of the present without compromising the ability of future generations to meet their own needs”
(Brundtland Commission 1987)
• More recently:“A dynamic process which enables all people to realize their potential and to improve their quality of life in ways which simultaneously protect and enhance the earth’s life support systems”
(Forum for the Future)
The Concept of Sustainable Development
Environmental(viable natural environment)
Sustainable Development
(well-being)
Social (nurturing community)
Economic (sufficient economy)
Sustainable natural and built environment
Equitablesocial environment
Sustainable economicenvironment
Figure by MIT OCW.
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Challenges to make development sustainable
• Differences in timescales: bridging the gap between typical political and commercial timescales and the long view of sustainability
•Dealing with economic market-technology ‘failure’: learning whymarket economics and technology do not interact fast enough to produce sustainability - and changing the signals
•Defining ‘progress’ to sustainability: better indicators and sustainability measurements to drive better choices
•Addressing the harder ‘social dimension’: including ‘social’components in projects; social objectives for products and projects; consulting properly with local communities
•Understanding and engaging with real world complex systems: changing our ‘world view’ to understand complex interactions and feedback loops, and changing to adopt the ‘precautionary principle’
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Use of Raw Materials in the U.S.
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Construction and the Environment
US Primary Energy Consumption:
Buildings 37%Industry 36%Transportation 28%
Source: US Dept. of Energy (2002)
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Construction and the Environment
In the United States, buildings account for:
37% of total energy use(65% of electricity consumption)30% of greenhouse gas emissions30% of raw materials use30% of waste output (136 million tons/year) 12% of potable water consumption
Source: US Green Building Council (2001)
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Embodied Energy vs. Operating Energy
00
2000
A
C
D
B
4000
6000
20
Cum
ulat
ive
Ener
gy (G
J)
40
Years
60 80 100
A = High operatingB = Normal operatingC = Low operatingD = Embodied
KEY
Figure by MIT OCW.
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LEED Green Building Rating System
• Supported by the US Green Building Council• Consensus-based rating system, crafted by
professionals in the building profession• Originally geared towards new (office space)
construction, but now piloting modified rating schemes for homes, commercial interiors, renovations, and neighborhood development
• Building that participate in the rating system attain Certified, Silver, Gold or Platinum status based on points earned
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LEED Categories
27%
Sustainable Sites
Water Efficiency
Materials and Resources
Energy and Atmosphere
Indoor Environmental Quality
22%
23%
20%8%
Figure by MIT OCW.
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LEED Criticism• Benefits
Raises consciousness of ownersEncourages integrated designFacilitates discussions about the benefit of environmentally preferable building design strategiesEasily navigated; accessible to all building professionalsConstantly re-examined and updated
• LimitationsEquivalent point values are given to non-equivalent design strategies and improvementsOften reduced to a point optimization processEvaluation mechanisms are often overly simplified and therefore misleadingCan only gain points for doing good, never lose points for inflicting harm
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Life Cycle AssessmentAn introduction to basic principles
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Life Cycle Assessment – What is it?• Life cycle assessment is the process of evaluating the total
effects that a product has on the environment over its entire existence – starting with its production and continuing through to its eventual disposal.
• It is fundamentally a decision-making tool.
Image from: Svenska Mineral
Figure by MIT OCW.
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Life Cycle Assessment – What is it?
• It accounts the energy and resource inputs, as well as the polluting outputs to land, water and air that result from the production of a product.
• It is an extremely complex environmental assessment tool that requires massive amounts of data which are often hard to find or expensive to purchase.
• It is still a method in progress:“There is no single method for conducting LCA studies. Organizations should have flexibility to implement LCA practically as established in this International Standard, based upon the specific application and the requirements of the user.”
(ISO 14040:1997)
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Diagram from: “Life Cycle Assessment: What It Is and How To Do It” Published by the United Nations Environmental Programme
THE FRAMEWORK FOR LIFE CYCLE ASSESSMENT
Goal Definitionand Scope
1. Goal definition
and scope
ImprovementAssessment
8. Reporting and improvement
assessment
Inventory Analysis
2. Constructing the process flow chart
3. Collecting the data
4. Defining the
system boundaries
5. Processing the data
Impact Assessment
KEY
6. Classification and
characterization
7. Valuation
SETAC LCAFramework
Detailed steps proposed in this publication
Figure by MIT OCW.
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Goal Definition and Scope
• What is being studied?• Who is the intended audience?
• What is the functional unit to be examined?• What are the data requirements?• Are there any potentially critical assumptions to be
made?
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What is being studied and for whom?
• LCAs can be used privately, as a design tool within product development.
comparative and iterative“quick-and-dirty”
• LCAs can be published for the purposes of eco-labeling.
attempt at absolute classification (it is actually a comparativeassessment within a larger field)require better data quality and precise calculations
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Establishing the functional unit
• The functional unit is the comparison criterion or metric used in LCA
It is a comparison of product functions instead of product typesor brands.
It often includes some indication of time.
Life Cycle Assessment relies on well-formulated functional units to establish sensible comparative baselines against which to compare various product or project alternatives.
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Data quality requirements
• Time-related coverage• Geographical coverage• Technological coverage• Precision, completeness and representativeness• Consistency• Clearly stated sources and factors of uncertainty
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Critical assumptions
• LocationIs the data local, regional, worldwide?
• Transport mechanismAre materials being transported by truck, ship, rail, air?How far are materials being transported?
• Equipment efficiencyIs the data based on state-of-the-art equipment or average-performing equipment?
• Levels of aggregation of data
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Diagram from: “Life Cycle Assessment: What It Is and How To Do It” Published by the United Nations Environmental Programme
THE FRAMEWORK FOR LIFE CYCLE ASSESSMENT
Goal Definitionand Scope
1. Goal definition
and scope
ImprovementAssessment
8. Reporting and improvement
assessment
Inventory Analysis
2. Constructing the process flow chart
3. Collecting the data
4. Defining the
system boundaries
5. Processing the data
Impact Assessment
KEY
6. Classification and
characterization
7. Valuation
SETAC LCAFramework
Detailed steps proposed in this publication
Figure by MIT OCW.
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Constructing a Process Flow Chart
• Helps identify scope of investigationLocates critical processesLocates “hidden” flows
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Gypsum Production Flow Chart
123
2
emissions:to air
to waterto land
transportwater
energy
Desulfurisation
Prefabricated gypsumbuilding components Multiphase plaster Anhydrit plaster
Gypsum mineral(calciumsulfate dihydrate,
CaSO4 + 2H2O)
120-180 oC 240-600 oC
Anhydrit rock natural(calciumsulfate, CaSO4)
Gypsum mine
Calciumsulfate hemihydrate(α/β-CaSO4 H2O + H2O)
Products:1) Plaster of Paris2) Stucco
Anhydrit II CaSO4 II + 2H2O
Products:1) Overburned plaster
Possible activators: mixture of
Acid activators:
1) alkali-metal and2) heavy metal salt + CaOH
1) potassium hydrogen -sulfate or2) iron (II) sulfate
Figure by MIT OCW.
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Constructing a Process Flow Chart
• Helps identify scope of investigationLocates critical processesLocates “hidden” flows
• Helps identify nature and amount of data required
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Bar Screens Cyclone Degritter Primary
Clarifiers
Anoxic tank
AerationSecondary Clarifiers
Sand Filters UV Disinfection
Dissolved Air Flotation Thickener
Anaerobic Digesters
Cogeneration Plant
Belt Filter Press
Influent Effluent
Solid Wastes
Biogas
Wastewater Treatment Facility Diagram
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Constructing a Process Flow Chart
• Helps identify scope of investigationLocates critical processesLocates “hidden” flows
• Helps identify nature and amount of data required in the assessment
• Helps identify logical system boundaries
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Assigning project boundaries• In principle, the analysis boundaries should include
all resource extractions and environmental emissions related to a product.
Practically, the boundaries of an analysis cannot capture the complete picture.
Figure by MIT OCW.
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Collecting and Processing Data
• This is the most time and effort intensive portion of an LCA.
• Allocation procedures must be established when looking at systems that have multiple product flows.
• The calculation of energy flows and resulting extractions and emissions must take into account the different fuels used.
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Data Sources• Eco-invent Database
FeesExtensive European data on full range of building products, energy production, transport, etc.Data manipulated within the SimaPro user interfaceFranklin database (US equivalent) currently under development
• Athena CMIFeesCanadian data with good range of building productsThe Athena Institute also provides a user interface for evaluation of data
• BEES (NIST)FreeNorth American data on a small handful of building productsVery limited in scope
• EIOLCA (Carnegie Mellon)FreeHighly aggregated North American dataLimited in scope, breadth, and transparency of output data
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Diagram from: “Life Cycle Assessment: What It Is and How To Do It” Published by the United Nations Environmental Programme
THE FRAMEWORK FOR LIFE CYCLE ASSESSMENT
Goal Definitionand Scope
1. Goal definition
and scope
ImprovementAssessment
8. Reporting and improvement
assessment
Inventory Analysis
2. Constructing the process flow chart
3. Collecting the data
4. Defining the
system boundaries
5. Processing the data
Impact Assessment
KEY
6. Classification and
characterization
7. Valuation
SETAC LCAFramework
Detailed steps proposed in this publication
Figure by MIT OCW.
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Classification• Classification categories
Abiotic depletion » result of extraction of non-renewable raw materials
Energy depletionGlobal warming
» effects of CO2 and other greenhouse gasesPhotochemical oxidant creation
» smogAcidification
» result of nitrogen and sulphur oxide releases into atmosphereHuman toxicityEcotoxicity (aquatic and terrestrial)Nutrification
» addition of nutrients to soil and water, resulting in reduction of oxygen
Ozone depletion
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Characterization
• Inventory data inputs and outputs assigned to relevant impact categories
• Characterization: components of each impact category are aggregated to one representative type
Acidification Potential is unequally affected by NOx, ammonia, and SO2
the AP index is represented in kg of SO2/kg, where:
1 kg of NOx is considered equivalent to 0.7 kg SO2
1 kg of NH3 is considered equivalent to 1.9 kg SO2
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Characterization Equivalency FactorsADP EDP GWP POCP AP NP ODP
Acetylene 0.168Ammonia 1.9 0.35Ammonium 0.33Benzene 0.189Cadmium 1.9x10-9
Carbon Dioxide 1Chemical Oxygen Demand 0.022ChlorobenzeneCFC-12 7100 1Halon-1202 1.3Hexane 0.421Hydrocarbons 0.377Lead 1.3x10-11
Methane 11 0.007Mercury 1.8x10-7
Nitrate 0.1Nitrite 0.13Nitrogen 0.42Nitrogen Oxides 0.7 0.13Nitrous Oxide 270Phospate 1Sulphur Dioxide 1Trichloromethane 25Copper 2.9x10-12
Crude Oil 42.3(/kg)Natural Gas 35.7(/m3)Tin 2.3x10-10
Zinc 6.8x10-12
Multiple outputs affect each environmental impact category
Multiple impact categories can be affected by a single output
The result of this step is a series of indices (one per category) that describe the product in question
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Normalization
• Which is more harmful?Global warming potential = 250kg CO2 equivalentNutrification potential = 149kg PO4
-3 (phosphate) equivalent
Normalization is a process by which the environmental index is “scaled” to some regional or global referent.
• Which is more harmful?Global warming potential = 250kg/37.7x1012 kg CO2 equivalent
Nutrification potential = 149kg/74.8x109 kg phosphate equivalent
6.6 x 10 –12
relative to global CO2 production
1995 x 10 –12
relative to global Phosphate production
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Valuation and Interpretation
• Subjective weighing process
Affected by location, politics, interests, opinions
• End result is a single environmental index, whichsimplifies all of the data into one value
Loss of transparencyLoss of specificityGain in comparability
• Known sets of weighing factors:
EPS systemEcopointsNSAEL factorsetc.
The Steps Involved in Impact Assessment
The
Inve
ntor
y Ta
ble
CO2CH4O3CFCNOx......
Global Warming
NOxNH4PCOD......
SO2NOxNH4......
Acidification
Nutrification
Environmental Index
Classification and Characterization Valuation
...... .......................
...... .......................
Figure by MIT OCW.
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Why use LCA?• It is quantitative.
LCA provides an objective, scientific, numerical basis for decision-making.Enhances the reproducibility and consequent credibility of an environmental assessment.
• It is integrative.By looking at a product or product function from cradle to grave, the LCA process avoids problem shifting.It encourages early interdisciplinary collaborations
SD DD CD Construction Completed Building
Cost of change
Ease of change
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Evaluating the Built Environment(or, why people don’t tend to use LCA for buildings and infrastructure)
Framing
• The built environment is a collection of products and functions.
Single-family home
FoundationsEnvelope
ConcreteWindows
Insulation
Gypsum Board
WoodCement
AggregateTreatment
Milling
Glass FrameSealant
Paper
Cellulose
Binder
Gypsum Ore
Water
Process energy
Transport Operational energy
Sand AluminumClinker
MiningTreatment
Paint
Glass CoatingMetal CoatingFasteners
Water
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Some Challenges of using LCA to assess the Built Environment
• Comparable products may have radically different LCA outputs due to method of production, distance from job site, machinery used in production and installation, etc.
Often producers are reluctant to reveal disaggregated data as it may reveal trade secrets
• Data does not yet exist reliably in aggregated form
• The method of construction can affect the longevity and end of life options of a product, thereby potentially rendering an LCA misleading (if it exists at all)
Many of these challenges can be addressed to some degree by selecting appropriate scope and assessment boundaries that minimize sensitivity and error
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Life Cycle AssessmentA quick example
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Example: Cork
• Touted to be an environmentally preferable product in building
FlooringInsulation
• It is considered a rapidly renewable resource.
• Characteristics:Low density (lightweight)High elasticityLow thermal and electrical conductivityHigh resistance to wearing
• Often combined with binders that have potentially negative effects on the environment.
Cork Harvest
Cork Storage
Triturationand Sieving
Cork and Resin Pressed to Slab
Resin Production
Slab Sanding
Slab Storage
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System and Data Boundaries
Cork Harvest
Cork Storage
Triturationand Sieving
Cork and Resin Pressed to Slab
Resin Production
Slab Sanding
Slab Storage
Raw Cork, at forest road
Transport!
Cork Slab, at plant
Transport!
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Data Acquisition(source: ecoinvent database)
There are a little over 1000 emission categories listed per product!
• Emissions to air
• Emissions to water
• Emissions to land
• Resource use
• Land use
• Waste generation
• Etc.
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Data Processing
• Identify economic flowsProcess products“Goods and Services”
• Identify environmental flowsNatural resources; raw materialsEmissions to land, air, and water
Raw Cork, at forest road
Transport truck
Etc.
Formaldehyde
Waste heat
Etc.
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Next Steps
• LCA assumes linearity• Input/output accounting results in a set of
simultaneous equationsAs long as some mechanism has been implemented to deal with the problem of allocation, there should be as many equations as there are unknown variables.
• Solving the equations gives the total environmental impact of the production of 1 kg cork slab, at plant
This is easily done in spreadsheet format
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Simple Matrix FormulationCork Slab (kg)
Cork Slab (kg) 1Raw Cork (kg) -1.06Melamine resin (kg) -0.056Urea-formaldehyde (kg) -0.056Phenole-formaldehyde (kg) -0.028Wood Chips (MJ) -6Electricity (kWh) -1Transport by 32t truck (tkm) -3.45
Waste Heat (MJ) 3.6Formaldehyde (kg) 0.00014Landfill (kg) 0.00371
Econ
omic
Flo
ws
Envi
ronm
enta
l Flo
ws
Processes in ColumnsP
rodu
cts
in R
ows
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Simple Matrix FormulationCork Slab
(kg)Raw Cork
(kg)Melamine Resin (kg)
Electricity (kWh)
Cork Slab (kg) 1Raw Cork (kg) -1.06Melamine resin (kg) -0.056Urea-formaldehyde (kg) -0.056Phenole-formaldehyde (kg) -0.028Wood Chips (MJ) -6Electricity (kWh) -1Transport by 32t truck (tkm) -3.45
Waste heat to air(MJ) 3.6Formaldehyde to air (kg) 0.00014Sandpaper to landfill (kg) 0.00371
Eco
nom
ic F
low
sE
nvir
onm
enta
l Flo
ws
A
B
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Simple Matrix Formulation
As = fA is the Economic matrixs is the Scale vectorf is the Economic flow vector
Bs = gB is the Environmental matrixs is the Scale vectorg is the Environmental profile
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Questions?