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Efficient Solutions and Cost-Optimal Analysis for Existing School Buildings

Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy
Energy Efficiency and Renewables Unit, Energy, Transport and Climate Institute, Joint Research Centre (JRC)—European Commission, 21027 Ispra (VA), Italy
Author to whom correspondence should be addressed.
Academic Editor: Chi-Ming Lai
Energies 2016, 9(10), 851;
Received: 14 July 2016 / Revised: 21 September 2016 / Accepted: 26 September 2016 / Published: 21 October 2016
The recast of the energy performance of buildings directive (EPBD) describes a comparative methodological framework to promote energy efficiency and establish minimum energy performance requirements in buildings at the lowest costs. The aim of the cost-optimal methodology is to foster the achievement of nearly zero energy buildings (nZEBs), the new target for all new buildings by 2020, characterized by a high performance with a low energy requirement almost covered by renewable sources. The paper presents the results of the application of the cost-optimal methodology in two existing buildings located in the Mediterranean area. These buildings are a kindergarten and a nursery school that differ in construction period, materials and systems. Several combinations of measures have been applied to derive cost-effective efficient solutions for retrofitting. The cost-optimal level has been identified for each building and the best performing solutions have been selected considering both a financial and a macroeconomic analysis. The results illustrate the suitability of the methodology to assess cost-optimality and energy efficiency in school building refurbishment. The research shows the variants providing the most cost-effective balance between costs and energy saving. The cost-optimal solution reduces primary energy consumption by 85% and gas emissions by 82%–83% in each reference building. View Full-Text
Keywords: school; buildings; retrofit; nearly zero energy buildings (nZEBs); cost-optimal methodology school; buildings; retrofit; nearly zero energy buildings (nZEBs); cost-optimal methodology
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Congedo, P.M.; D’Agostino, D.; Baglivo, C.; Tornese, G.; Zacà, I. Efficient Solutions and Cost-Optimal Analysis for Existing School Buildings. Energies 2016, 9, 851.

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