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Pombo, Olatz; Allacker, Karen; Rivela, Beatriz; Neila, Javier
Energy and buildings, 03/2016, Letnik: 116Journal Article
•A multi-criteria methodology for the analysis of retrofitting solutions is proposed.•LCA and LCC are combined by expressing environmental impacts in monetary values.•A Pareto optimization is used to select the preferred strategies.•The methodology is illustrated by a case study in Madrid, Spain.•Business as usual scenario is far from being an optimal solution. The building sector is well known to be one of the key energy consumers worldwide. The renovation of existing buildings provides excellent opportunities for an effective reduction of energy consumption and greenhouse gas emissions but it is essential to identify the optimal strategies. In this paper a multi-criteria methodology is proposed for the comparative analysis of retrofitting solutions. Life Cycle Assessment (LCA) and Life Cycle Cost (LCC) are combined by expressing environmental impacts in monetary values. A Pareto optimization is used to select the preferred strategies. The methodology is exemplified by a case study: the renovation of a representative housing block from the 1960s located in Madrid. Eight scenarios have been proposed, from the Business as Usual scenario (BAU), through Spanish Building Regulation requirements (for new buildings) up to the Passive House standard. Results show how current renovation strategies that are being applied in Madrid are far from being optimal solutions. The required additional investment, which is needed to obtain an overall performance improvement of the envelope compared with the common practice to date, is relatively low (8%) considering the obtained life cycle environmental and financial savings (43% and 45%, respectively).
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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