Abstract
Nearly zero-energy buildings (nZEBs) will be the standard in Europe in the future. How nZEBs are defined and therefore designed varies amongst Europe due to different national definitions/ legislations. Furthermore, finding the optimal building design and technology sets for nZEBs under different boundary conditions (climate, availability of renewable energy sources on-site etc.) and for different building types (residential, non-residential) is still a challenge. Many studies in the field focus on active technologies and renewable energies in buildings. However, the effects of passive approaches on energy consumption are not quantified. This paper therefore focuses on the quantification of the effects of passive design approaches/ technologies to improve the energy performance of buildings. Passive approaches are the basis for finding optimal nZEB technology sets. Technology sets are combinations of different types of technologies in nZEBs for both the satisfaction of energy needs and thermal comfort requirements. In this paper different passive approaches for already realized buildings in different European countries with different climate conditions (Stuttgart (Germany), Kiruna (Sweden) and Palermo (Italy)) are demonstrated. Even though several technologies are available to achieve nZEBs, applying and combining these technologies in an optimal way is still a challenge. Furthermore, higher initial investment costs for nZEBs are an obstacle for the market acceleration of nZEBs. Hence finding the best trade-off amongst the different goals, optimizing the most promising passive approaches that can be applied is a central part of the solution.
Highlights
Buildings are responsible for approximately 40% of energy consumption in the EU (Buildings Performance Institute Europe, 2011)
Essential for realizing Nearly zero-energy buildings (nZEBs) is the minimization of the energy demand of a building by a high-quality thermal envelope and a building design suitable for local conditions
Which approaches are suitable for a building is highly depending on the climate conditions and the respective main energy demand
Summary
Buildings are responsible for approximately 40% of energy consumption in the EU (Buildings Performance Institute Europe, 2011). This sector is increasing daily which increases the energy demand. As determined in the European energy performance of buildings directive (EPBD), it is needed to increase the energy efficiency of buildings to achieve the objective of reducing the Union’s energy consumption by 20% until 2020. As heating and cooling in buildings and industry account for half of the EU’s energy consumption the need to increase the efficiency in these consumption sectors is high (The European Parliament and The Council of the European Union, 2018)
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