Buildings of highest energy-efficiency with integrated renewable energy development

For the future supply of energy services the combination of energyefficiency, energy storage and decentralized use of renewable energy inbuildings offers itself. The project identifies dynamic potentials of possibleactive and passive energy yields of construction units with use of renewableenergy sources, points future solutions to energy-efficient and ecologicaldesign of building construction-units and unites all results to a signpost:From today's passive house to the energy-plus-house of the future.

Short Description




Starting point / motivation

Energy supply services for buildings (including households and companies) are largely responsible for the primary energy consumption in Austria. Because the supply is mainly based on fossil energy sources, high import dependence and a curical security of energy supply linked with it are given. In addition, fossil energy sources cause immense greenhouse gas emissions during production process of components and the building operations, briefly about the whole life cycle. Under the background of these aspects, from ecological and macroeconomic view, a sustainable and secure supply of renewable energy sources and energy-efficient system solutions are aimed as objective.

Contents and goals

The conception of energy-efficient components of the mantle with integrated renewable "energy production" is the prior step and central beginning point to the creation of a sustainable energy system with a clear rise of energy efficiency, reduction of greenhouse gas emissions and improvement of security of supply by use of renewable energy sources locally available. The long-term vision which is a matter to reach is a building sector that comes from an energy consumer to a supplier of energy and this corresponds to the innovative concept of an energy-plus-building.

Detailed scientific analysis take this reason to the present project concerning technical, economical and ecological aspects to the implementing of an energy-plus-building standard as well as required political measures to control of this process. This requires an integral perception of the whole house as a system which includes comprehensive aspects from design, planning and creation of buildings as well as building components. This includes polygeneration based on renewable energy sources, thermal energy storage, constructive measures to the minimisation of thermal bridges and long time durability, architectural and spatial planning optimisation strategies in building rehabilitation and in building construction, analysis of the accumulated CO2 emissions for the whole life cycle, the identification of fundamentals to the substitution of electric energy by thermal energy, a socio-economic description of the technology diffusion as well as a final whole optimisation of the collected results concerning relevant aim functions like minimisation of the costs and greenhouse gas emissions and maximisation of the energy yields of the building cover. A sound cover of all fields of investigation within this fundamental study is given by the interdisciplinary straightened composition of the project pool. The central questions of the project are tied together with the objectives for reaching an energy-plus-building standard which can be formulated as follows:

The vital aim of the project "Gebäudeintegration (building integration)" is to form the building cover - to different criteria for construction and renovation - very energy-efficiently to minimise heat losses with integrated renewable energy supply systems and to consider, besides, ecological (e.g. greenhouse gas minimisation), architectural, spatial planning and socio-economic aspects (e.g. diffusion rates). Recommendations on energy policy and the clear presentation of results for different building types in concrete case studies (dwelling house, office building and factory building) complete the scientific investigations.

Project Partners

Project management

Reinhard Haas
Vienna University of Technology
Institute of Power Systems and Energy Economics (Energy Economics Group)

Project or cooperation partner

  • Vienna University of Technology, Institute for Thermodynamics and Thermal Engineering
    Markus Haider
  • Vienna University of Technology, Institute for Engineering and Technology
    Thomas Bednar
  • Vienna University of Technology, Institut for Architecture and Design
    Karin Stieldorf
  • GrAT - Center for Appropriate Technology (scientific association at the Vienna University of Technology)
    Robert Wimmer

Contact Address

Vienna University of Technology
Institute of Power Systems and Energy Economics (Energy Economics Group)
Gußhausstraße 25-29/373-2
A- 1040 Vienna
Fax: +43 (1) 58801 - 37397