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Comparative life cycle assessment of car disc brake systems—case study results and method discussion about comparative LCAs
KTH, Maskinkonstruktion (Avd.).ORCID iD: 0000-0001-7401-4550
KTH, Maskinelement.ORCID iD: 0000-0001-6633-8168
2020 (English)In: The International Journal of Life Cycle Assessment, ISSN 0948-3349, E-ISSN 1614-7502, Vol. 25, p. 350-362Article in journal (Refereed) Published
Abstract [en]

Purpose: Two life cycle assessment (LCA) studies comparing a new low-particulate-matter-emission disc brake and a reference disc brake were presented. The purpose was to identify the difference in potential environmental impacts due to a material change in the new disc brake parts. Additionally, the validity was investigated for the simplification method of omitting identical parts in comparative LCA. This was done by comparing the results between the simplified and the full LCA model.

Methods: The two disc brakes, new disc brake and reference disc brake, were assessed according to the LCA ISO standards. The ReCiPe 2016 Midpoint (hierarchist) impact assessment method was chosen. Simplifying a comparative LCA is possible, all identical parts can be omitted, and only the ones that differ need to be assessed. In this paper, this simplification was called comparative LCA with an omission of identical parts.

Results and discussion: The comparative impacts were analysed over seventeen impact categories. The new disc brake alternative used more resources during the manufacture of one disc compared to the reference disc brake alternative. The shorter life length of the reference disc demanded a higher number of spare part discs to fulfil the same functional unit, but this impact was reduced due to material recycling. The new disc brake impacts were connected primarily to the coating and secondly to the pad manufacture and materials. The validity of the simplification method was investigated by comparing the results of the two LCA models. The impact differences were identical independent of the LCA model, and the same significant impact categories could be identified. Hence, the purpose of the study could be fulfilled, and the simplification was valid.

Conclusions: Both LCA models, simplified and full, revealed that the new disc brake had limited environmental advantages. The omission of identical parts made it more challenging to determine if an impact was significant or insignificant. The simplification seemed to be reasonable.

Place, publisher, year, edition, pages
2020. Vol. 25, p. 350-362
Keywords [en]
Comparative LCA, Disc brake, LCA simplification method, Material choice impacts, Particulate emissions
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:hig:diva-34512DOI: 10.1007/s11367-019-01704-9ISI: 000493939500001Scopus ID: 2-s2.0-85074826400OAI: oai:DiVA.org:hig-34512DiVA, id: diva2:1506708
Projects
LOWBRASYS
Funder
EU, Horizon 2020, 636592Available from: 2020-12-04 Created: 2020-12-04 Last updated: 2020-12-07Bibliographically approved

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Tasala Gradin, KatjaHedlund-Åström, Anna

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CiteExportLink to record
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