Influence of inventory cutoff rules on whole-building LCA results
The scarce publications on whole-building lifecycle assessment (wbLCA) highlights the need to reduce the number of flows considered. Cutoff rules facilitate inventory modeling, but their effects are underexplored in the literature. This work investigates how the most well-known cutoff approaches use...
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Universidade Estadual de Campinas
2020
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Pulgrossi, Lizzie Monique Silva, Vanessa Gomes da |
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Pulgrossi, Lizzie Monique Silva, Vanessa Gomes da Influence of inventory cutoff rules on whole-building LCA results |
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Pulgrossi, Lizzie Monique Silva, Vanessa Gomes da |
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Pulgrossi, Lizzie Monique |
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Influence of inventory cutoff rules on whole-building LCA results |
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Influence of inventory cutoff rules on whole-building LCA results |
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Influence of inventory cutoff rules on whole-building LCA results |
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Influence of inventory cutoff rules on whole-building LCA results |
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Influence of inventory cutoff rules on whole-building LCA results |
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influence of inventory cutoff rules on whole-building lca results |
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The scarce publications on whole-building lifecycle assessment (wbLCA) highlights the need to reduce the number of flows considered. Cutoff rules facilitate inventory modeling, but their effects are underexplored in the literature. This work investigates how the most well-known cutoff approaches used in wbLCA - by mass and energy, as indicated by the EN 15804 standard, and by building elements, as adopted by LEED v4 certification – influence the assessment results, relatively to a baseline, complete inventory. Cradle to grave impacts was calculated for two case studies. SimaPro v8.5/9.0 supported processes composition and adaptation from the Ecoinvent database. CML-IA baseline and CED methods were used for impact assessment, and k-means clustering highlighted relationships amongst environmental categories. Whilst the European cutoff rule retains a considerable share of impacts on all categories, the elements excluded by the LEED approach mostly impact non-assessed categories, such as ecotoxicity, human toxicity, and abiotic depletion. These categories are highly affected by some building materials production. The free choice of three environmental categories to assess may also result in information redundancy whenever they pertain to the same cluster. To balance inventory completion viability while ensuring the integrity of wbLCA conclusions, we recommend that the certification compute over 75% of the metals used in the building and strategically expand the set of categories evaluated on a mandatory basis. Additional studies are now needed to confirm our findings and validate propositions for certification-oriented wbLCA. |
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Universidade Estadual de Campinas |
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2020 |
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https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8658259 |
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AT pulgrossilizziemonique influenceofinventorycutoffrulesonwholebuildinglcaresults AT silvavanessagomesda influenceofinventorycutoffrulesonwholebuildinglcaresults AT pulgrossilizziemonique influenciaderegrasdecortedeinventarionosresultadosdeacvdeedificacoes AT silvavanessagomesda influenciaderegrasdecortedeinventarionosresultadosdeacvdeedificacoes |
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oai:ojs.periodicos.sbu.unicamp.br:article-86582592020-09-25T17:29:26Z Influence of inventory cutoff rules on whole-building LCA results Influência de regras de corte de inventário nos resultados de ACV de edificações Pulgrossi, Lizzie Monique Silva, Vanessa Gomes da Avaliação do Ciclo de Vida ACV de edificação completa Regras de corte LEED Certificação Life Cycle Assesment Whole-building LCA Cutoff rules LEED Certification The scarce publications on whole-building lifecycle assessment (wbLCA) highlights the need to reduce the number of flows considered. Cutoff rules facilitate inventory modeling, but their effects are underexplored in the literature. This work investigates how the most well-known cutoff approaches used in wbLCA - by mass and energy, as indicated by the EN 15804 standard, and by building elements, as adopted by LEED v4 certification – influence the assessment results, relatively to a baseline, complete inventory. Cradle to grave impacts was calculated for two case studies. SimaPro v8.5/9.0 supported processes composition and adaptation from the Ecoinvent database. CML-IA baseline and CED methods were used for impact assessment, and k-means clustering highlighted relationships amongst environmental categories. Whilst the European cutoff rule retains a considerable share of impacts on all categories, the elements excluded by the LEED approach mostly impact non-assessed categories, such as ecotoxicity, human toxicity, and abiotic depletion. These categories are highly affected by some building materials production. The free choice of three environmental categories to assess may also result in information redundancy whenever they pertain to the same cluster. To balance inventory completion viability while ensuring the integrity of wbLCA conclusions, we recommend that the certification compute over 75% of the metals used in the building and strategically expand the set of categories evaluated on a mandatory basis. Additional studies are now needed to confirm our findings and validate propositions for certification-oriented wbLCA. A escassa literatura disponível sobre avaliação do ciclo de vida de edificações (ACVed) aponta a necessidade de reduzir os fluxos considerados. As regras de corte auxiliam a viabilizar a modelagem, mas o efeito de variações na sua aplicação é inexplorado na literatura. O objetivo deste trabalho é investigar a influência da aplicação das duas principais abordagens de corte de inventário utilizadas em ACVed - por massa e energia, indicada pela norma EN 15804, e por subsistema construtivo, como adotado pela certificação LEED v4 - relativamente ao inventário mais completo possível (“best-of-knowledge”). Impactos do berço ao túmulo foram calculados para dois casos. A plataforma SimaPro v8.5/9.0 apoiou a composição dos processos e adaptações da base Ecoinvent. Foram utilizados os métodos CML-IA baseline e CED para avaliação de impacto, e clusterização k-means para prospecção de relações entre categorias ambientais. Enquanto a regra de corte europeia retém uma parcela considerável dos impactos em todas as categorias, os subsistemas excluídos pelo LEED afetam principalmente categorias não avaliadas, mas em que a produção de materiais de construção tem efeito relevante, como ecotoxicidades, toxicidade humana e depleção abiótica. Adicionalmente, a livre escolha de três categorias ambientais propicia redundância de informação, caso elas façam parte de um mesmo cluster. Para equilibrar a viabilidade da ACVed, enquanto se assegura a integridade das conclusões, recomendamos que a certificação adicione subsistemas na avaliação até que mais de 75% dos metais sejam computados, e amplie estrategicamente o conjunto de categorias avaliadas mandatoriamente. Estudos adicionais são agora necessários para confirmar estas proposições. Universidade Estadual de Campinas 2020-12-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Text Texto application/pdf https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8658259 10.20396/parc.v11i0.8658259 PARC Pesquisa em Arquitetura e Construção; Vol. 11 (2020): Continuous publication; e020026 PARC Pesquisa em Arquitetura e Construção; Vol. 11 (2020): Publicação contínua; e020026 PARC Pesquisa em Arquitetura e Construção; v. 11 (2020): Publicação contínua; e020026 1980-6809 por https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8658259/25692 Campinas, Brazil; Comteporary Campinas, Brasil; Contemporâneo Copyright (c) 2020 PARC Pesquisa em Arquitetura e Construção https://creativecommons.org/licenses/by/4.0 |