Sustainable Building Case Studies

Renovation of a listed "Art Nouveau" building in Nuremberg

Architecs
© Chris Ryan
Architecs
Measures

  • Gas condensing boiler
  • Ventilation and heat recovery
  • Insulation with ecological insulating materials


Energy Savings

After the renovation, the building's heating requirement fell by almost 60% and is now around 109 kWh/m2a.

Office buildings of the Civil Engineering Office in Nuremberg

Engine
© Fotolia
Engine
Measures

  • Insulation
  • Thermal insulation composite system
  • Replacement of boiler installation
  • Control technology
  • Installation of a mini bio fuel heating system


Energy Savings

The building's systems technology was renovated at a cost of €127,000. The outdated boiler unit was replaced by a gas condensing boiler and low-temperature technology. Overall, the renovation resulted in annual energy savings of approximately 270 MWh and reduced the energy costs for heating by around one third.




Renovation and reconstruction of a childcare facility in Wismar

School in Wismar
© Institut für Gebäude + Energie + Licht Planung (IGEL)
School in Wismar
Measures

  • Insulation
  • Gas condensing boiler and buffer storage unit
  • Solar panels
  • Ventilation and heat recovery
  • Windows


Energy Savings

After the energy-efficient renovation and reconstruction of the childcare facility was completed, energy consumption dropped by about 65%. The renovation also resulted in a significant reduction (21%) in the ventilation heat loss.

Radical refurbishment of the office towers of the KfW Bankengruppe (banking group)

KfW refurbishmentKfW refurbishment
© RKW Architektur + Städtebau Fotograf: Carsten Costhard
KfW refurbishment
Measures

  • Curtain wall systems
  • Daylight systems
  • Optimised lighting
  • Ventilation and heat recovery
  • Combined heat and power generation
  • Combined heat and cooling
  • Control technology
  • Control and optimisation of operations
  • Building automation
  • Curtain wall systems
  • Daylight planning and systems


Energy Savings

A CHP system has been providing the building's heating since the mid-1990s. Since the renovation, the waste heat from this system is now used by absorption cooling machines to generate cooled air. This innovation has played a major role in reducing the building's primary energy consumption, which was almost halved. It is now down from 331.1 kWh/m2a to 174.6 kWh/m2a.

"Neue Burse" student hall of residence, Wuppertal

Student hall of residence, Wuppertal
© Pixelio
Student hall of residence, Wuppertal
Measures

The hall of residence was thoroughly modernised and given an energy makeover in two phases. The first construction phase adhered to low-energy standards, and the second was in line with passive house standards.

Key points:

  • Insulation
  • Curtain wall systems
  • Windows and glazing
  • Ventilation and heat recovery


Energy Savings

Renovation cut the primary energy consumption by more than 60% to 80 kWh/m2a. After the first phase alone, the heating requirement fell by approximately 58% to around 68 kWh/m2a. The renovation to bring the building in line with passive house standards should reduce it further to 26 kWh/m2a. The renovation reduced total energy costs to just 15 Euro/m2a and the total cost of electricity to 6 Euro/m2a.

Käthe-Kollwitz School, Aachen

Käthe-Kollwitz School, Aachen
© Stadt Aachen
Käthe-Kollwitz School, Aachen
Measures

  • Insulation
  • Optimised lighting
  • Ventilation and heat recovery
  • Combined heat and power generation
  • Combined heat and cooling
  • Control technology
  • Operating control systems
  • Building automation



Energy Savings

As part of the renovation, the heating circuit distributor and pump technology were replaced, and a new ventilation system with integrated heat recovery technology was installed. The pipework was also upgraded from a single-pipe to a double-pipe system. The final energy requirement for room heating, hot water and ventilation dropped by 65% as a result. The primary energy requirement, meanwhile, fell by more than 75% to 47.0 kWh/m2a. Total costs of this work amounted to €2.8 million.

Lighting in an average 1970s office building for 200 employees with gross floor space of 4,250 m².

Measures:

  • Variation A: complete replacement of the existing lighting - without control technology
  • Variation B: complete replacement of the existing lighting - with additional on-site and daylight control


Energy Savings:

Energy consumption was cut by up to 75%. This can cut costs by €13,500 a year. The amortisation period is just under four years.

Bremen State and University Library

Bremen State and University Library
© University Library Bremen
Bremen State and University Library
Measures

  • Optimised lighting
  • Ventilation with heat recovery
  • Active cooling
  • Renewable and passive cooling
  • Control technology, operating control systems, building automation
  • Optimisation of operations


Energy Savings

Energy costs for ventilation, refrigeration and cooling were reduced by 73%, from 11 EUR/m2a to 3 EUR/m2a. The primary energy consumption for heating, cooling, ventilation and lighting dropped by 70%, from 831 kWh/m2a to 230 kWh/m2a.

Printing company in Karlsruhe

Printing company in Karlsruhe
© www.patrick-beuchert.de
Printing company in Karlsruhe
Measures

  • Curtain wall systems
  • Windows and glazing
  • Optimised lighting
  • Ventilation and heat recovery
  • Regenerative and passive cooling
  • Thermo-active building component systems
  • Daylight planning


Energy Savings

Energy consumption was significantly reduced, thanks to an innovative cooling system and a sophisticated building design. The building measures and integrated cooling system with heat recovery reduced heating requirements by almost 90% to 21 kWh/m2a. The primary energy consumption fell from 344 kWh/m2a to 86 kWh/m2a. Construction costs amounted to 860 Euro/m2, while the cost of implementing the technical systems was 370 Euro/m2.