Life cycle assessment of a plastic air intake manifold

PurposeNowadays, some engine components subjected to mechanical stress and high temperature are made of thermoplastic materials. The air intake manifold (AIM) is one of these parts. In the past, AIM was made of aluminium or magnesium alloy, while today, engine manufacturers prefer to use lighter materials such as nylon reinforced with glass fibre. The scope of this work is to assess from an environmental point of view the adoption of two alternative thermoplastic materials (polyamide reinforced with 30 % of glass fibre and polypropylene reinforced with 35 % of glass fibre) for the construction of a Magneti Marelli® AIM and the introduction in the production stage of new additional design solutions (scraps recycling and brass inserts elimination). The outcome of the paper would contribute both to establish a baseline for comparison with other composite AIMs and to improve the knowledge of materials and manufacturing technologies related to the product.MethodsThe study has been performed applying the LCA methods as described in the ISO standards 14040 and 14044. The life cycle inventory (LCI) captures the whole AIM life-cycle (LC) subdivided in four stages: materials supply, production, use and end-of-life (EoL). For the LCI data collection, primary data have been provided by the AIM manufacturer, while available databases have been used as source for secondary data. Unlike previous LCAs regarding AIM, the environmental profile is assessed through a broader range of life cycle impact assessment (LCIA) impact categories as provided by the CML 2001 framework in its November 2010 release.Results and discussionThe results show that for both the polyamide composite and the polypropylene composite, the AIM the most influential LC stages are use and materials supply. Such outcome is due to the considerable quantity of fuel consumed during the whole LC and the energy/resources consumption involved by the raw materials extraction and production processes. The substitution of polyamide composite with polypropylene composite reduces the potential environmental impacts for all the categories and for each stage of the AIM LC. Contribution analysis by LC stage of potential environmental impact evidences that the change of material involves a remarkable increase of the use stage quota with no notable mutation of production and EoL contributions. The introduction of scraps recycling and brass inserts elimination entails no significant impact reduction for all the categories with the only exception of abiotic depletion potential (ADPe).ConclusionsThe substitution of polyamide composite with polypropylene composite involves considerable reduction of the AIM LC impact, while the introduction of scraps recycling and brass inserts elimination entails negligible effects.

[1]  Nicolas Tchertchian,et al.  Benefits and limits of a Constraint Satisfaction Problem/Life Cycle Assessment approach for the ecodesign of complex systems: a case applied to a hybrid passenger ferry , 2013 .

[2]  Not Indicated,et al.  International Reference Life Cycle Data System (ILCD) Handbook - General guide for Life Cycle Assessment - Provisions and Action Steps , 2010 .

[3]  Ki-Ho Lee.  A Study on the Influence of Plastic Intake Manifold on the Performance and NVH of In-line 4 Cylinder Gasoline Engine , 1998 .

[4]  Saeed Siavoshani,et al.  Analytical and Experimental Techniques in Solving the Plastic Intake Manifold NVH , 2001 .

[5]  Jasper Becker,et al.  Joint Research Centre , 1982, Nature.

[6]  Constantinos Soutis,et al.  Environmental impact assessment of aviation emission reduction through the implementation of composite materials , 2014, The International Journal of Life Cycle Assessment.

[7]  Hiroyuki Tanaka,et al.  Development of a Plastic Intake Manifold with CAE , 2007 .

[8]  Gregory A. Keoleian,et al.  Elucidating complex design and management tradeoffs through life cycle design: Air intake manifold demonstration project , 2003 .

[9]  P. K. Mallick,et al.  Investigation of Thermoforming as a Method of Manufacturing Plastic Air Intake Manifolds , 2000 .

[10]  Ryuichi Hayashi,et al.  Meeting Present and Future Global Materials Requirements for Nylon Air Intake Manifolds , 1996 .

[11]  Christoph Koffler,et al.  Life cycle assessment of automotive lightweighting through polymers under US boundary conditions , 2014, The International Journal of Life Cycle Assessment.

[12]  Carlo N. Grimaldi,et al.  Dependence of NVH Performance of Plastic Air Intake Manifolds on the Structural Design , 2006 .

[13]  John Klein,et al.  HIGH PERFORMANCE ENGINEERED POLYPROPYLENE COMPOUNDS FOR HIGH TEMPERATURE AUTOMOTIVE UNDER-THE-HOOD APPLICATIONS , 2011 .

[14]  E. Carlson,et al.  NYLON UNDER THE HOOD : A HISTORY OF INNOVATION , 1996 .

[15]  Marco Pierini,et al.  Design for disassembly: a methodology for identifying the optimal disassembly sequence , 2007 .

[16]  David J. Moenssen,et al.  Acoustic Modeling and Radiated Noise Prediction for PlasticAir-Intake Manifolds , 2003 .

[17]  R. Cossu,et al.  Review of Italian experience on automotive shredder residue characterization and management. , 2014, Waste management.

[18]  W. W. Kraft.  The Reduction of Air-Rush Noise in Plastic Engine Intake Manifolds , 2000 .

[19]  Franc Pricken.  Top Acoustic of Plastic Air Intake Manifolds , 1999 .

[20]  H. Paffrath,et al.  Technology for Future Air Intake Systems , 1999 .

[21]  Gregory A. Keoleian,et al.  Application of Life Cycle Design to Aluminum Intake Manifolds , 1996 .

[22]  P. J. Bates,et al.  Vibration welding air intake manifolds from reinforced nylon 66, nylon 6 and polypropylene , 2004 .

[23]  Marco Pierini,et al.  On-field investigation and process modelling of end-of-life vehicles treatment in the context of Italian craft-type authorized treatment facilities. , 2013, Waste management.

[24]  Susumu Yamaguchi.  Development of Plastic Intake Manifold by DRI Process , 2000 .

[25]  Thomas Moura,et al.  Plastic Intake Manifold Influence on the NVH Performance in PFI Engine , 2012 .

[27]  Christoph Koffler,et al.  On the calculation of fuel savings through lightweight design in automotive life cycle assessments , 2009 .

[28]  R. Capitani,et al.  A method for conducting validation testing on polyamide engine components , 1999 .

[29]  Renzo Capitani,et al.  Vehicle Consumption Evaluation Using Simulation Models Reproducing Gear Management Strategies , 2003 .

[30]  Thomas Moura,et al.  Air Intake Manifolds Manufactured with Chemically Recycled Material Achieve a Reduction of CO 2 Emissions and Costs Saving with Similar Mechanical Resistance , 2012 .

[31]  Haley Jones,et al.  A system dynamics approach in LCA to account for temporal effects—a consequential energy LCI of car body-in-whites , 2012, The International Journal of Life Cycle Assessment.

[32]  Patrick Rousseaux,et al.  Life cycle assessment of automotive fuels: critical analysis and recommendations on the emissions inventory in the tank to wheels stage , 2011 .

[33]  Francesco Del Pero,et al.  Life Cycle Assessment of a heavy metro train , 2015 .

[34]  Rüdiger Hoffmann,et al.  Application of Life Cycle Assessment for the Environmental Certificate of the Mercedes-Benz S-Class (7 pp) , 2006 .

[35]  Yuji Ikeda,et al.  Development of a plastic intake manifold , 1996 .