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LCA Examples & Streamlined LCA
Ericsson LCA
Paper “Life Cycle Assessment of 3G Wireless Telecommunication Systems at Ericsson” available in the module network folder.
Summary of the study “Life Cycle Assessment of a Third Generation (3G) System at Ericsson” available in the module network folder.
Ericsson LCA
Goal– Develop a flexible LCA model with the capacity of
producing reliable environmental information for Ericsson’s present and future needs
– Develop a user-friendly database with all the LCA data collected during this and previous Ericsson LCA studies
– Determine and describe the environmental impact from Ericsson’s 3G wireless telecommunication systems
Ericsson LCA
Scope– System consists of 3G terminals, radio network,
control equipment & a core network with switches, routers, servers and workstations
– Transmission equipment like feeders and cables & site materials like antennas, climate control equipment and site housing
Ericsson LCA
Functional Unit– One year of operation of the 3G pilot system is
studied– For comparisons another functional unit, per
subscriber and information flow and year is needed.
Ericsson LCA
Following Indicators studied– Climate change– Resource depletion– Acidification– Photochemical ozone generation– Aquatic eutrophication– Terrestrial eutrophication– Ozone depletion– Land use– Human toxicity– Ecosystem toxicity
Ericsson LCA
Focuses on the climate change indicator as it is the most widely accepted environmental indicator.
Based on the global warming potential (GWP) and is measured in CO2 equivalents
Two external independent scientists reviewed the LCA to ensure carried out to ISO14040 series specification. Although data is not available to the public, the data used is valid and interpretations are accurate
Ericsson LCA
Ericsson LCA
Ericsson LCA
What impact does my 3G subscription have?
+0.06% raw material resources depletion +0.7% energy resources depletion & climate change +0.004% use of land resources
LCA of an Integrated Circuit
Paper available in Network folder EPROM IC chosen for study Gate to Gate study Functional Output is a complete EPROM
device Carried out according to relevant ISO
standards
LCA of an Integrated Circuit
Front End
Transport
Back End
Device
Raw Wafer
LCA of an Integrated Circuit
Oxidation Masking
EtchingDoping
Dielectric Deposition
Metallisation
PassivationElectrical Test
Raw Wafer
Processed Wafer
Front End Processed Wafer Production
LCA of an Integrated Circuit
Cut Welding Base
BoundingPackaging
Electrolytic Tuning
Surbase Clipping
Insert on Tube
Processed Wafer
Device
Back End Device Realisation
LCA of an Integrated Circuit
Transport– Packaging for transport– Truck to airport (40km)– Plane from Milan to Singapore (10,000km)– Truck to site (10km)
LCA of an Integrated Circuit
Material Quantity
DI Water 29 litres
Oxygen 140 mg
Nitrogen 122 g
Hydrogen 2.9 mg
Ceramic 7 g
PVC 0.4 g
HDPE 0.1 g
Lead 0.03 mg
Copper 1.2 mg
Tin 0.15 g
Boron 2.9 mg
Arsenic 6.9 mg
Selected total inventory data forone single EPROM device
LCA of an Integrated Circuit
Phase Quantity (MJ)
Front End 2.39
Transport 2 x 10 -6
Back End 10.11
Use 58.35
Total 70.85
Gross energy in different life cycle phases of one single device
LCA of an Integrated Circuit
Energy Use Phase– Specific device requires 0.36 Watts– Life estimated at 10 years– Equipment obsolescence estimated less than this (5
years)– Real operating time approx 33% of equipment life– 1MJ of electrical energy requires 3MJ of gross
energy– Use phase turns out to be 54 MJ
LCA of an Integrated Circuit
Effect Quantity (g equivalent) Unit
Global warming 394 CO2
Ozone Depletion 0.0001 CFC 11
Acidification 0.39 H+
Nutrient Enrichment 0.222 PO4
Average Environmental Effect related to one EPROM device
Streamlining the LCA Process
Full LCA is only practical with no limitations to time, expense, data availability etc…
In practice consists of many compromises Although very extensive LCA’s have been
conducted a complete quantitative LCA has never been accomplished nor is it ever likely to be
Design stage is best time to do LCA but very little data available at this point
The LCA Continuum
EcoscreeningFully Comprehensive LCA
Currently Accessible Region
Extensive LCA
Streamlined LCA
LCA Scoping
Streamlining the LCA Process
Screen the product with an inviolates list Limit of eliminate life-cycle stages Include only selected environmental impacts Include only selected inventory parameters Limit consideration to major constituents Limit or eliminate impact analysis Use surrogate data Use qualitative rather than quantitative data Eliminate interpretations or recommendations
The SLCA Matrix
Number of approaches developed adopting a matrix approach in which several life stages are evaluated for their potential impacts on a number of environmentally related concerns
Any SLCA process should allow for– Direct comparisons between rated products– Useable and consistent across different assessment teams– Encompass all stages of product life cycle– Address all relevant environmental concerns– Simple enough to permit relatively quick and inexpensive
assessments
The SLCA Matrix
Environmental Concern
Life Stage Materials Choice Energy Use Solid Residues Liquid Residues Gaseous Residues
Resource Extraction 1,1 1,2 1,3 1,4 1,5
Product Manufacture 2,1 2,2 2,3 2,4 2,5
Product Delivery 3,1 3,2 3,3 3,4 3,5
Product Use 4,1 4,2 4,3 4,4 4,5
Refurb/ Recycle/ Disposal 5,1 5,2 5,3 5,4 5,5
Developed in 1993 at AT&T
The SLCA Matrix
Values may be – Binary
1 = problem 0 = no problem
– Ordinal 1-10 severity ranking 1-4 severity ranking
Assessor is providing a figure of merit to represent the estimated result from a more formal LCA
Should be guided by experience, design & manufacturing survey, appropriate checklists & other available info
The SLCA Matrix
Once an evaluation has been made for each matrix element the overall Environmentally Responsible Product Rating (RERP) is computed as the sum of the matrix element values
Process is qualitative and utilitarian but does provide a numerical end point against which to measure improvement
i j jiERP MR ,
Target Plots
The SLCA Matrix
Assignment of integer ratings may seem subjective, experiments at AT&T have been performed in which comparative assessments of products are made by several different industrial and environmental engineers. Overall product ratings differ by no more that 15%
SLCA Assets
More efficient & less costly (days vrs months) Useable at the early stage of design when
opportunities for change are greater Evaluate design attributes which are inherently
qualitative such as ease of dissassembly
SLCA Liabilities
Little or no ability to track overall material flows Little ability to compare completely dissimilar
approaches to fulfilling a need Little ability to track improvements over time
Cumulative Energy Demand as SLCA
Ref: Mhuijbregtsm M, Hellweg S, Hensriks "Cumulative Energy Demand As Predictor for the Environmental Burden of Commodity Production" Environ. Sci. Technol., Article ASAP DOI: 10.1021/es902870s
CED as SLCA
CED as SLCA
time
CED
CED as SLCA
T1
Further Reading
Graedel & Allenby, Chapter 17