Life Cycle Assessment. Audi looks one step ahead
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1 Life Cycle Assessment Audi looks one step ahead
2 Life cycle assessment the concept Times change. Raw materials are becoming scarcer, emissions are on the increase and many cultures in various parts of the world are undergoing major changes. Against this backdrop, careful use of resources is gaining in importance all the time. Audi is helping to make this change true to the technical leadership implied in its classic motto 'Vorsprung durch Technik'. Modern technologies, new materials and highly efficient components are available to optimise vehicle design. For Audi, as a pioneer in vehicle development, progress in the careful use of non-renewable resources is a task that involves every area of its activities. Life cycle assessments (LCA) are important procedures that can help to reduce the motor vehicle's impact on the environment. Audi not only assesses the vehicle while it is in use, which mainly concerns its fuel consumption, but the entire life cycle from production to recycling. Audi looks one step ahead. 2
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4 Life cycle assessment what's involved The life cycle assessment analyses the effects of a product on the environment during its entire existence, from production to its period of use and its end-of-life recycling. It is a quantitative evaluation of ecological aspects such as the emission of greenhouse gases (including carbon dioxide [CO 2 ]), energy consumption, acidification or 'summer smog'. Audi compiles its life cycle assessments according to the procedure laid down in the international ISO series of standards. Assessment of a vehicle s complete life cycle as a major contribution to more sustainable treatment of the environment. 4
5 Development phase: Production phase: Use phase: Recycling phase: assessment of materials and semi-finished product manufacturing chains assessment of components and complete vehicles assessment of fuel/electricity (including production) assessment of process chains of valuable materials Stages in motor-vehicle life cycle assessment Materials and production Input Energy Raw materials Recycling Production components (depending on manufacturing concept) Output Emissions Waste Use 5
6 Life cycle assessment the boundaries Before a life cycle assessment is compiled, its boundaries must be defined by deciding which processes should be examined. The available means, the time framework and data availability all have to be taken into account. Audi has laid down broad limits for its complete-vehicle life cycle assessments. The examination starts with the manner in which raw materials are obtained, and how individual components are manufactured. Even during the first new-model development stages the engineering teams have to take decisions that have major effects on in-house production and the entire supply chain. 6 Audi's experts assume for assessment purposes that vehicles will cover a distance of 200,000 kilometres. They not only take into account the emissions caused when the vehicle is being driven, but also those that occur when the fuel is produced. Recycling at the end of the vehicle's life and the use of secondary raw materials are also included in the life cycle assessment.
7 System boundaries of vehicle LCA Manufacture Raw material extraction Semi-finished product manufacture Component manufacture Supply pipeline Transport refining provision of fuel Recovery of energy and raw materials Production Use Recycling = product system 7
8 Life cycle assessment effect categories The result of the inventory analysis is converted into effect indicators and these in turn are grouped into effect categories which describe the principal environmental problem-areas: the 'greenhouse effect' (global warming potential), eutrophication of water and soil, 'summer smog', acidification and damage to the ozone layer. When evaluating the greenhouse effect, which is a major indicator, the Audi LCA specialists list the effects resulting from all gases that influence the climate. The gases are included in the LCA according to their effect in relation to CO 2, but the importance of other effect categories as well as the greenhouse potential is not disregarded. 8
9 Effect of substances on the environment Inventory analysis Effect indicators Estimated effect Extraction of raw materials CO 2 CH 4 Global warming potential Eutrophication Manufacture SO 2 Photochemical smog Production Utilisation / transport NO x HC Acidification Ozone breakdown R 11 Recovery / Recycling 9
10 Life cycle assessment questions The central factor that has to be considered in Audi life cycle assessments is the effect that possible optimisation will have in the various phases of a vehicle's life. For example, the use of lightweight materials usually leads to additional effort or complexity in component manufacturing. On the other hand, the vehicle weighs less and therefore consumes less fuel in the subsequent operating phase. For Audi, environmentally acceptable lightweight construction means that the savings during vehicle operation must be greater than the additional effort and expense caused in the production phase. 10
11 Environmentally acceptable lightweight construction Additional environmental burden caused by manufacture of lightweight materials 0 Reduced environmental burden during vehicle operation as a result of lightweight construction 11
12 Life cycle assessment the influencing factors LCA is a tool that enables Audi to evaluate the effects of strategic decisions when new vehicle concepts are being developed. This concerns in-house processes and also those used by outside suppliers. Even a single modification can have a negative effect on one of the phases in the life cycle, but if the drawbacks are more than compensated for in another phase, the balance is then positive. In practice this means that the extra effort and expense involved in using lightweight materials is made good by reduced consumption in the vehicle's use phase, so that there is an advantage below the line compared with a conventional concept. 12
13 LCA of different vehicle concepts Materials and production Use Recycling Greenhouse gases [in t CO 2 equivalent] Additional burden by lightweight design Break-even Depreciation distance 0 km km Influencing factors (examples) Net reduction of greenhouse gases Materials Component concepts Degree of weight saving Production Processes Energy sources Electricity mix Weight of vehicle Power unit Type of fuel Drivetrain efficiency Production of fuel type Processes Energy sources Electricity mix Recovery of valuable materials Conventional construction Environmentally acceptable lightweight construction 13
14 Lightweight construction choice of materials The choice of materials has a decisive effect on the CO 2 emissions that occur in component manufacturing. The range is wide, in view of the many different manufacturing and recycling methods involved. Due to the production process and the nature of the energy source, primary aluminium gives rise to higher emissions than occur in the production of primary steel. If on the other hand recycled aluminium can be used, the effort and expense are at a lower level, comparable with recycled steel. At Audi the recycling process starts in the production phase, when trimmings from the presses are collected and returned for recovery. 14 Production recycling makes a significant reduction in CO 2 emissions possible.
15 Greenhouse gas emissions for various materials [kg CO 2 eq. / kg component weight] Steel Aluminium Magnesium CFRP* = Process-dependent scatter *Carbon fibre reinforced polymer The scatter bandwidths for the various materials result from the different manufacturing and recycling processes that can be used. 15
16 Lightweight construction component concepts If a vehicle's use phase is considered in isolation, then lightweight materials are extremely attractive. The chart shows the potential weight saving for components with identical functions if a modern lightweight material is used instead of conventional steel. Aluminium is about two-thirds lighter than steel, but metal of slightly heavier gauge has to be used for a vehicle body. An aluminium body built according to the Audi Space Frame (ASF) principle weighs about 40 percent less than a comparable steel body. Magnesium is about a third lighter than aluminium. At the moment it is mainly used in the form of castings. Carbon fibre reinforced polymer (CFRP) a composite material containing about 50 percent woven carbon fibre in a resin matrix is even lighter than magnesium, but offers a similar overall weight saving. Its production is still extremely intensive in terms of energy consumption. 16
17 Lightweight potential of components (identical functions) 100 % 75 % 50 % 100 % ~ 40 % ~ 55 % ~ 55 % Weight-saving potential, depending on material and manufacturing processes (compared with steel): ~ 40 % for aluminium ~ 55 % for magnesium ~ 55 % for CFRP 25 % 0 % Steel Aluminium Magnesium CFRP 17
18 Lightweight construction secondary effects The weight reduction that Audi achieves by using lightweight materials permits welcome secondary effects in other areas of the vehicle. Lower body weight initiates a downward turn in the weight spiral, which permits chassis and drivetrain components to be downsized, for instance by reducing the size of the brakes. Weight-saving potential is possible in every technical area. In the life cycle assessment these savings help to compensate for the additional effort and expense incurred in the manufacture of lightweight materials. 18
19 Reversing the weight spiral Downsizing of engine Lightweight body construction Secondary effects, e.g. transmission Secondary effects, e.g. chassis, brakes A smaller fuel tank Detailed lightweight construction in all areas Lightweight construction is the starting point for a reversal of the weight spiral. 19
20 Audi A6 the life cycle assessment Audi has compiled a detailed LCA for the new A6. For comparison, the engineers chose the top-selling model from previous generation, the A6 3.0 TDI with automatic transmission. A notable achievement on the new model is reversal of the weight spiral: the new Audi A6 3.0 TDI quattro is 80 kilograms lighter. This is due to more intensive weight-saving measures applied to the body, engine, drivetrain and chassis. The chart shows all the areas that contributed significantly to this reduction. 20
21 MMI 3G system integration Aluminium module cross-member Engines and transmissions optimised for weight saving adoption of lightweight materials for functional integration Cast aluminium suspension strut domes Use of high-end steel grades in the bodyshell, including form-hardened grades and tailored blanks Aluminium rear shelf Aluminium boot lid Aluminium bonnet Aluminium bumper system Aluminium pipes Aluminium axle components Aluminium fender quattro drivetrain optimised for weight saving Lightweight composite brake discs Lightweight forged wheels Aluminium doors Neodymium speakers 21
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23 Audi A6 materials The materials used for the product have a significant influence on the LCA. According to the material classification in VDA directive , the proportion of lightweight metals in the new Audi A6 3.0 TDI is about 19 percent of the car's curb weight, three percentage points more than in the previous model. By contrast, the proportion of steel and other ferrous metals went down by 5 percent. Audi has extensively replaced steel with aluminium. Previous Audi A6 New Audi A6 16 % 3% 16 % 6 % 4 % 5 % 5 % 17 % 55 % 50 % 4 % 19 % 1. Steel / iron 2. Light metals 3. Non-ferrous metals + 4. Special-purpose metals 5. Polymers + 6. Process polymers 7. Other materials + 8. Electrics / electronics 9. Fuels and auxillary means 23
24 Audi A6 the results of the life cycle assessment The new Audi A6 contains a higher proportion of light metals than the previous model, and in most cases more energy is consumed in their production. Despite this, the break-even point is reached before the first 5,000 kilometres have been driven, and from this point on the new car's much lower fuel consumption makes the balance more positive with every successive kilometre. Although the previous model emitted scarcely 53 metric tons of CO 2 equivalents during its complete life cycle, the new Audi A6 has distinctly less impact on the environment: 46 t of CO 2 equivalents. In other words, Audi has succeeded in reducing greenhouse gas emissions by 7 metric tons of CO 2 equivalents or 13.2 percent. In all other relevant effect categories too, the new model records better results than its predecessor. Reduction of all examined effect categories Global warming potential -13 % Photochemical ozone creation potential -4 % Acidification potential -3 % Ozone depletion potential -0,5 % Eutrophication potential -3 % 24
25 Materials and production Use Recycling Fuel consumption: [kg of CO 2 equivalents] Audi A6 3.0 TDI quattro tiptronic (previous model) Audi A6 3.0 TDI quattro S tronic Audi A6 3.0 TDI quattro tiptronic (previous model) 7.1 l / 100 km Audi A6 3.0 TDI quattro S tronic (new model) 6.0 l / 100 km Distance covered [km] The additional burden caused by more intensive lightweight construction and drivetrain optimisation is written off during the first 5,000 kilometres. 25
26 Life cycle assessment electromobility Electrically propelled vehicles such as future e-tron models from Audi have a highly efficient drivetrain and cause no local emissions. Of course, responsibility does not end at the electric power socket. In the use phase, the complete 'well-to-tank' CO 2 emissions caused by the generation and supply of electric power have to be included in the LCA. As the chart shows, there are immense differences between the various regions of the world, depending on the local electricity mix. In China most electricity comes from coal-fired power stations with intensive CO 2 emissions, whereas in Norway clean hydroelectric power predominates, and emissions of CO 2 equivalents (in grams per kwh) there are lower than in China by a factor of 25. The chart on page 28 shows the effect of the electricity mix on the operation of a compact-class electric car. In China its emissions of greenhouse gases total 171 grams per kilometre, in Norway a mere 7 grams. For this reason Audi plans for its future e-tron models to be operated exclusively on electricity generated by ecological means. With its e-gas project, Audi will be playing an active part in the development of regenerative electricity production. 26
27 A similar picture is revealed if the production and recycling phases are added to the use phase. An electric car has a much better overall balance than a conventional vehicle powered by a petrol engine in Norway, whereas in China the balance is worse. The chart on page 29 also shows that the production of a conventional car accounts for about 20 percent of total emissions, and that this proportion is higher for an electric vehicle because production of the batteries consumes a large amount of energy. Greenhouse gas emissions caused by electric power generation / well-to-tank (selected countries) g CO 2 eq. / kwh China 1140 g EU 25* 560 g Norway 46 g Coal Nuclear power Hydroelectric Others 23 % 77 % 77 % 39 % 19 % 32 % 1 % 99 % 10 % *Electricity mix of EU 25-Members (2007) 27
28 Greenhouse gas emissions from electric vehicles in relation to the electricity mix Greenhouse gas emissions g CO 2 eq. / km Assumption: battery-electric vehicle, compact class consumption: 15 kwh / 100km China EU Norway 28
29 Greenhouse gas emissions balance in relation to electricity mix Internal combustion engine Materials and production ~ 20 % ~ 80 % < 1 % Use (well-to-wheel) Recycling Electrically propelled Electricity mix as in China ~ 25 % ~ 75 % ~ 1 % Electricity mix as in Europe ~ 45 % Electricity mix as in Norway ~ 90 % ~ 5 % ~ 5 % ~ 55 % ~ 2 % Better Poorer than reference vehicle with internal combustion engine Assumption: compact class car, distance 200,000 km, consumption: internal combustion engine: 5.5 l fuel / 100 km electric drive: 15 kwh / 100 km 29
30 Life cycle assessment conclusion The public today tends to judge cars to a large extent by their fuel consumption. Here too, Audi looks one step ahead. Its life cycle assessments analyse effects on the environment for the vehicle's entire lifetime. The use of sustainable materials and manufacturing processes can greatly reduce these effects. The LCA that Audi has compiled for its new A6 shows on the one hand that the new saloon model is superior to its predecessor in all environmentally relevant criteria. In addition it is sound evidence that the lightweight design measures Audi has adopted quickly pay for themselves during the use phase, despite the higher energy consumption they entail. The weight advantage soon makes itself felt as a worthwhile reduction in CO 2 emissions an admirable example of environmentally acceptable lightweight design as Audi understands it. Although electric vehicles are locally emission-free, a 'well-to-tank' assessment is essential if their potential environmental benefit is to be correctly estimated. Considerable differences occur according to the regional electricity mix. No ecological benefit is obtained unless renewable energy is used. Audi is now helping to develop it. 30
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32 Impressum: AUDI AG Total Vehicle Development and Product Communications Ingolstadt Tel: Fax Status: 05 / 2011
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