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Inspiration from Germany

Efficiency house plus, single family house - new building - energy demand: 110,27 kWh/m²a, energy production: 113,09 kWh/m²a

Energieeffizienzhaus Plus, Frontansicht

front view charging stations  touchscreen kitchen
This 147 m2 building with the latest state-of-the-art technology in the area of energy efficiency is energy - self-sustaining and therefore produces a very low ecological impact. A modern heat pump, a photovoltaic system on the roof as well as on the building´s walls, an optimized building shell and technical installations produce an energy surplus which is fed into the public power grid or stored in high performing batteries. So the energy can also be used to power the electric cars and E-Bikes belonging to the house. The building´s technical installations are controlled via touch panels and smartphones. The houses´ control systems calculate the optimal energy use and charging plan of the batteries according to the weather forecast. All interior as well as the building itself are almost completely recyclable.

Pictures copyright: Federal Ministry for Transport, Building and Urban Development

Schoolbuilding in Berlin - refurbishment- energy demand: 117.8 kWh/m²a

Front view Heatpump Ventilation system

This landmarked school building has been made energy efficient and now meets almost the criteria of a zero-emission-building. This was achieved through an innovative internal insulation system, which allowed preserving the historic roof and façade, as well as through the energy efficient modernization of the historic wooden frame windows, the installation of a modern low-temperature heating system with a geothermal heat pump and an intelligent co2- controlled ventilation system. All needed energy is produced almost completely with geothermal heat, which can also be used to cool the building, if necessary. The overall energy demand of the school could be reduced by nearly 90%.  

Picture Copyrights: B.&S.U. mbH

Multi-Family-House in Stuttgart - refurbishment- energy demand: 20 kWh/m²a

Front view Insulation of the façade Living room after the refurbishment

This 3-family-semi-detached house was built in 1958 as a massive construction. Its comprehensive energetical refurbishment to the EnerPhit standard started in 2010. Through a complete thermal insulation with an insulation thickness of 20 - 40 cm and U-values of 0,1 - 0,15 m2k the EnerPhit standard of a passive house has been reached. The almost thermal bridge free house has a heating demand of 25 kWh/m2/a. Further, a solar thermal power plant and a PV plant have been installed producing more energy than the inhabitants use, thus, making the house a PlusEnergyPassiveHouse.

Picture Copyrights: Sigrun Gerst

Office building "House 2019" of the Federal Environment Agency - New building

The new office building of the Federal Environment Agency is the first zero-energy house of the German Government. The property was built in a wood panelled construction with an insulation made from cellulose fibres derived from recycled waste paper. The energy needed is fully covered on site by renewable energy. The photovoltaic plant is installed on the roof and is producing about 58 kWp electricity. The predicted annual electricity production is 50,000 kWh. An electric heat pump produces heating and cooling energy for the house. A solar thermal system supports the warm water production. The facade consists of prefabricated wooden elements and the base plate and the roof have U-Values from 0.08 to 0.11 W/m2K. The windows with a U-value of 0.8 W/m2K prevent large heat losses in winter as well as excessive heat inputs in the summer.

Picture Copyrights: Federal Environment Agency

Federal Office for Building and Regional Planning (interior view)

Multi-Family-House - Passive house in Dresden - New building - Primary energy demand: 84 kWh/m²a

Facade, wood
Facade (roof), wood Internal wall
Panel heating

The 657m2 large passive house accommodates 5 barrier-free apartments with functional floor plans. It was the goal of the architects to use resource friendly building materials, reach low energy consumption, to ensure the possibility of future floor plan adjustments and to pay attention to the recyclability of the used materials. The bearing structure is, due to fire protection requirements, made of a reinforced concrete skeleton, facades and roof are constructed in timber with cellulose flakes (waste paper) as insulating material. The windows are fitted with 3-way glazing or casement windows (2 x 2 triple glazing). By tilting the inner window, the casement windows achieve heat gains on sunny winter days. The tilting of the outer window with closed interior windows protects against overheating in summer. An external sun protection is not required. The energy for hot water and heating is provided by district heating. Each apartment has an independent ventilation system with highly efficient heat exchangers. Only small panel heaters in the mud-plastered walls are required for heating in winter.

Picture Copyrights: Luc Saalfeld (Facades), Heiko Behrens