Suchergebnisse

The climate and energy package is a set of binding legislations which aims to ensure the European Union meets its ambitious climate and energy targets for 2020. These targets, known as the "20-20-20" targets, have set three key objectives: a 20% reduction in the EU greenhouse gas emissions, a 20% rise in the share of EU energy consumption produced from renewable resources and a 20% improvement in the energy efficiency. More renewable energies will enable the EU to lower greenhouse emissions and make it less dependent on imported energy. Boosting the industry of renewables will encourage technological innovation and employment in Europe. On this topic, photovoltaic façades are known to be a solution that allows both energy efficiency and environmental performance of buildings. This paper reports on a study of façade systems that have incorporated photovoltaic panels, considering computational simulations for Portugal. The main objective is to analyze the characteristics and parameters that define more efficient systems based on computer simulations carried out by Solterm 5.0. The results show the high potential of the use of the proposed technology in Portugal, especially in the Southern region, because of its latitude. Regarding energy efficiency and environmental performance, inclined polycrystalline silicon solar panels achieved the best results and the most efficient panel was Kyocera KC167G-2, followed by BP 3160. The comparison between simulation results and results provided in the literature shows that the use of computer programs is viable to the analysis of the energy efficiency of photovoltaic systems in ...

New legislation and incentives have been created, showing that there is an attempt to act and to intervene in energy efficiency area. Energy consumption reduction and prevention of energy waste is one of the main objectives of the European Union (EU). Building facades constitute a privileged component to propose solutions, once it has a major influence in the energy consumption in the building and in occupants comfort; because it has elements that contribute significantly with the heat transfer. This paper presents a study on about a new facade concept: "Facade Modules for Eco-Efficient Refurbishment of Buildings", especially on thermal performance of glazing modules. Computational simulation was done with the Design Builder software for ten different double glazing types (composed by green and transparent solar control glass, self-cleaning glass, two low-e glasses types, two extra clear glass) for two climates in Portugal (Coimbra and Faro) and four solar orientations (north, south, east and west). The results were obtained for heating and cooling energy necessities and were compared to all glazing types. These results showed a better performance to glazing compositions that combines solar control and self-cleaning glass with extra clear glass to both cities. Facades with green solar control glass and extra clear glass presented a better performance in comparison with others types studied, decrease cooling energy necessities. The great majority of the glass facade compositions presented heating and cooling energy necessities according to Portuguese standards (RCCTE) ...