Life Cycle Assessment LCA

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1 Laboratory for Heat and Power LCA Introductional lecture

2 Agenda What is LCA and how to use it? How to approach LCA 1. Goal and scope 2. Inventory analysis 3. Impact assessment 4. Analysis and interpretation Examples: Plastic bags CO2 emissions of vehicles 3 kw UPS system with PEM fuel cell 2

3 LCA what is and how it is defined?, as defined by the ISO and ISO is the compiling and evaluation of the inputs and outputs and the potential environmental impacts of a product system during a product s lifetime ISO introduction in LCA, definition and background ISO describes the procedure of making LCA model 3

4 LCA how is structured? 4

5 LCA some historical overview before Energy analysis in companies in energy intensity industry goal is to reduce costs of energy consumption and risk management linked to energy supply; 1969 The Coca-Cola USA first case Goal environmental impact of different packing - superiority of plastic packing 1984 Swiss federal laboratory initiation; Necessarily of lining up of LCA methodology and definition of basic standards and guidelines 90s SETAC (Society of Environmental Toxicology and Chemistry) organization establishment Basic material database and first eco-labels for mass production products till1996 Under EcoInvent Swiss center for life cycle basic databases definition of materials and processes from main industrial and economic branch od 1997 ISO standards list exact definitions for LCA terminology, methods, processes, environmental declarations, management with natural resources, measurements, etc. 5

6 4. Interpretation LCA phases and use LCA Framework 1. Definition of goal and scope 2. Inventory analysis 3. Impact assessment Direct use Research and improvement of products/processes Strategic planning Policy Marketing Othr. 6

7 LCA steps 1. GOAL of LCA SCOPE of LCA Life Cycle Inventory (LCI) - energy and mass balance and environmental impacts LCIA: Life cycle Inventory Assessment Basic Impact categories / Impact methodology 5. Interpretation / Analysis and reporting 6. Critical review (optional) 7

8 1. Goal and the Scope GOAL The use of LCA (marketing, product research, product improvement, etc.) The purpose: with purpose the scope is defined; Audience: public, shareholders, executives, engineers, consumers, etc. Usage for comparative analysis for publication of results critical review is obligatory; SCOPE During the scope definition the product or process system under study is characterized, all assumptions are detailed and the methodology used to set up the product system is defined. The following factors require definition before the LCA is done: Function of the product Functional unit Reference flow Description of the system System boundaries Allocation procedures Impact categories and the impact assessment method Data requirements Data assumptions Limitations Data quality requirements Peer review Reporting type Descriptions 8

9 Scope: purpose and functional unit Functionality of the product If different product are lined up, there functionality have to be exactly defined. EXAMPLE: Pen Purpose: writing/drawing Functional unit: draw of line, 1 mm thick in 5 km long and lasts 10 years Reference flow: is the number of pens that complete the purpose defined with functional unit: 1 pen of manufacturer A 1,2 pen of manufacturer B 9

10 Scope: Boundary conditions (the case of paper clip) Cut-off criteria: Which materials are included in the study (according to mass, environment impacts, etc.) By mass: usually all materials are included that represent more than 5 % of overall mass; by energy, market value, etc. From cradle to grave From cradle to gate From gate to gate From gate to grave 10

11 Scope: Allocation In many processes more than one product is produced. In such a case all inputs and outputs of the process have to be allocated to the different products. The allocation to different products can be done according to one of the rules defined below by mass: proportional to mass; by heating value: This allocation method is often used for production processes of fuels; By market value; By other rules; ISO14044 ISO suggests that allocation should be avoided whenever possible. The ISO also suggests that allocation according to physical relationships such as product mass or heating value rather than using nonphysical relationships between the products (for example the market price). PRIMER: 0,9 kg 0,1 kg Product A represents 90 % of mass, therefore 90 % of all impacts are allocated to product A allocation by mass. Instead of allocation we can use: System expansion; Substitution of material / process 11

12 Scope: Data quality Descriptions of data quality are important because the data quality has a significant influence on the results of the LCA study. Data quality requirements have to be determined at the beginning of the study. Data acquisition: Is the data measured, calculated or estimated? How much of the data required is primary data (in %) and how much data is taken from literature and databases (secondary data)? Time-reference: When was this data obtained and have there been any major changes since the data collection that might affect the results? Geographical reference: For what country or region is this data relevant? Technology (Best Available Technology) Is the secondary data from literature or databases representative for state-of-the-art-technology or for older technology? Precision: Is the data a precise representation of the system? Completeness: Are any data missing? How are data gaps filled? Representivity, consistency, reproducibility: Is the data representative, consistent and can it be reproduced? 12

13 2. Life Cycle Inventory - LCI table Data gathering and LCI table creation: Iterative process; Represents the revision of the process; Possible adaptation of goal/scope; The result is LCI table; Mainly mass and energy flows are included The setting up of LCI table 13

14 Life Cycle Inventory: Data gathering The most time demanding process in LCA study. All data of materials and processes have to be carefully listed: Inflows energy inputs raw material inputs ancillary inputs other physical inputs Products and co-products Outflows wastes emissions to air, water and soil other environmental aspects 14

15 Calculation of LCI Before calculating the life cycle inventory, the following three steps should be completed: Data Validation - Validating the collected data is a continuous process. This can be done with mass or energy balances as well as with a comparison to similar data. Also, methods have to be in place to handle data gaps. Relating Data to Unit Processes - The data has to be related to unit processes Relating Data to Functional Unit - The data has to be related to the functional unit. * In GaBi, the LCI of the whole system is generated automatically once a system of processes is set up. 15

16 3. LCIA: Life Cycle Impact Assessment The Life Cycle Impact Assessment (LCIA) identifies and evaluates the amount and significance of the potential environmental impacts arising from the LCI. Inputs and outputs are first assigned to impact categories and their potential impacts quantified according to characterization factors. Figure shows the conversion from emissions to impact potentials via classification and characterization. Required steps Classification characterization Optional steps Normalization Grouping /Weighting classification and characterization 16

17 Impact Assessment Methods There are different methods that can be used to perform a Life Cycle Impact Assessment. In life cycle impact assessment methods, such as TRACI or CML, two main approaches are used to classify and characterize environmental impacts: TRACI** (Tool for Reduction of Chemical and Environmental Impacts): mid-point method (problem oriented) - ZDA CML*: End point method (damage oriented) - EU * Centre of Environmental Studies, University of Leiden **EPA: U.S. Environmental Protection Agency EXAMPLE: ECOINDICATOR 95 metod damage oriented METHOD - Classification of flows in different impact categories - Impact categories are also grouped to belong to end-point categories: - damage to human health; - damage to ecosystem quality; - damage to resources; The used end points are easier to interpret and to communicate. The choice of impact categories and the choice of the impact assessment method should be documented in the goal and scope definition 17

18 LCIA: Classification and Categorization (ex.: methane) All emissions that add to GWP are transformed into CO 2 equivalent according to categorization factor. According to CML 2001 (Dec. 2007) methane has categorization factor of 25, that means it contributes 25 times more than CO 2, when the 100 year window is taken into account. Calculate the GWP of 6 kg of methane. 18

19 4. Interpretation Two basic steps that are iterative: I. Identification of significant issues II. Evaluation I. Identification of significant issues To identify the significant issues or data elements that contribute most significantly to the results of both the LCI and LCIA for each product, process or service. Can include: LCI elements: energy consumption, major material flows, wastes and emissions etc. Impact category indicators that are of special interest or whose amount is of concern Essential contributions of life cycle stages to LCI or LCIA results such as individual unit processes or groups of processes (e.g., transportation, energy production) The results can be presented in form of data lists, tables, bar diagrams or other convenient forms. They can be structured according to the life cycle phases, different processesd. 19

20 4. Interpretation Two basic steps that are iterative: I. Identification of significant issues II. Evaluation I. Evaluation The following three methods should be used for the evaluation a. Completeness check: In the completeness check, any missing or information will be analyzed to see if the information is necessary to satisfy the goal and scope of the study. b. Sensitivity check: The sensitivity check determines how the results are affected by uncertainties in the data, assumptions, allocation methods, calculation procedures, etc.. c. Consistency check: The consistency of the used methods and the goal and scope of the study is checked: data quality, system boundaries, data symmetry of time period and region, allocation rules and impact assessment. 20

21 4. Interpretation: conclusions, report and guidelines The goal of the life cycle interpretation phase is to draw conclusions, identify limitations and make recommendations for the intended audience of the LCA: Identify the significant issues; Evaluate the methodology and results for completeness, sensitivity and consistency; and Draw preliminary conclusions and check that these are consistent with the requirements of the goal and scope of the study 21

22 4. Interpretation: Report (reference document) 1. Administrative Information a. Name and Address of LCA Practitioner (who conducted the LCA study) b. Date of report c. Other Contact Information or Release Information 2. Definition of Goal and Scope 3. Life Cycle Inventory Analysis (data collection, calculation procedures, LCI table) 4. Life Cycle Impact Assessment (methodology, results) 5. Life Cycle Interpretation a. Results b. Assumptions and Limitations c. Data Quality Assessment 6. Critical Review (internal and external) a. Name and Affiliation of Reviewers b. Critical Review Reports c. Responses to Recommendations 22

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