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Life-cycle approach to the estimation of energy efficiency measures in the buildings sector

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  • Abd Alla, Sara
  • Bianco, Vincenzo
  • Tagliafico, Luca A.
  • Scarpa, Federico

Abstract

The implementation of energy efficiency measures is an effective way to gain energy savings in the Italian residential sector. This paper assesses the embodied energy impact related to the envelope insulation and evaluates the energy and carbon payback of the efficiency measures. The proposed method consists of (1) an estimation of the baseline operational energy consumption, (2) simulations of realistic retrofit solutions and, (3) the assessment of the ‘retrofitting’ embodied energy and the energy and carbon payback time calculation. The payback is based on the comparison between the saved operational energy and the embodied energy of the materials selected for insulation. Ten Italian cities are analysed, and the results show a deep dependence on the climate zone. In Northern Italian cities, envelope insulation gains relevance as the energy and carbon payback periods are shorter, about 3 years against the 84 years for the Southern city of Palermo. The optimal thickness is estimated for the city of Milan considering the building’s typology, the insulation materials, and the energy payback. This study shows how the total energy savings can be used as a criterion to obtain design indications.

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  • Abd Alla, Sara & Bianco, Vincenzo & Tagliafico, Luca A. & Scarpa, Federico, 2020. "Life-cycle approach to the estimation of energy efficiency measures in the buildings sector," Applied Energy, Elsevier, vol. 264(C).
    • Handle: RePEc:eee:appene:v:264:y:2020:i:c:s0306261920302579
    DOI: 10.1016/j.apenergy.2020.114745
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