New energy performance indexes for energy-efficient interactive buildings

• Autor(es): Panão, Marta Oliveira ; Camelo, Susana ; Gonçalves, Helder
• Data: 2013
• Identificador Persistente: http://hdl.handle.net/10400.9/2030
• Origem: Repositório do LNEG
• Assunto(s): Energy Performance Index; Energy Performance Certification; Interactive Buildings
• Tipo de Documento: Documento de conferência
• Idioma: Inglês

Descrição

This paper argues that promoting energy supply by Renewable Energy Sources (RES) in buildings, namely residential, requires additional informative indexes to be included in buildings Energy Performance Certificates. The load-generation approach for the energy balance is here discussed, and compared with the current recommended by CEN/TR 15615, i.e. the delivered-exported approach. Besides the Energy Performance Index, which takes the same value for both approaches, other indexes are studied. From the analysis considering two variants for a single-family house with six solutions for energy systems, it is suggested to include: i) L/R (building load vs benchmark load) and ii) G/L (RES supply vs building load). On the one hand, L/R distinguishes the solutions where the building envelope is optimized from those where the driver to reduce EPI is the RES supply installation. On the other hand, G/L quantifies the RES share in the building demand and goes in line with what is recommended for the principles defining nearly Zero Energy Buildings. The breakdown of G/L into on-site and off-site RES will be also very helpful in differentiating local RES supply from imported renewables fuels, such as biomass. Moreover, considering smart cities, not only energy flows are important but also information flows (e.g. energy forecast, energy management), thus, new energy performance indexes are required for energy-efficient interactive buildings.