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Construction Refurbishment Other

Case Study: nZEC - Energy refurbishment of 49 dwellings in Schultheißallee, Nürnberg, Germany

Name of organisation: WBG - Nürnberg GmbH Immobilienunternehmen

Stage of development: completed

Year of finalization: 2012

Type of project: refurbishment

Area: urban

Scale: individual buildings

Type of building: Apartment in a block of six to ten stories

Number of units/dwellings: 49

Tenure: social rental

Street: Schultheißallee, 34

Postcode: 90473

City: Nürnberg

Region/ County: Bavaria

Country: Germany

Last Update: 14.04.2015

Funding Certification Work with Residents Thermal Insulation Windows and Shading Air Tightness Heating and Hot Water Ventilation Solar Thermal

Short Description

The 1964 constructed residential building in the Schultheißallee with 49 dwellings has been refurbished in the scope of the 4th project phase of the German Energy Agency (dena) model project "Low-energy house model for existing buildings".

- Insulation of outside walls, pedestal body and roof, replacement of the windows, improvement of fire protection in important areas.

- Removal of the old reinforced concrete balcony construction, installation of pre-set steel balconies.

- Removal of the window parapets and installation of passive house windows for the access to the balcony. Thereby improvement of the living.

- Refurbishment with passive house components consequently avoiding thermal bridges. All construction works have been done in inhabited condition.

- New installation of transfer station of the existing district heating, insulation of the heating cable according to Energy Saving Ordonance .

- All bathrooms were connected to the hotwater heating system, new groundworks. Installation of a controlled ventilation system under further use of the existing ventilation lines.

- The thermal solar installation with tube collectors on the roof contributes to high solar coverage of the warm water needs.


Key Elements

Certification

  • Annual primary energy requirement  QP=12,9 kWh/(m²a)
  • Specific transmission heat loss HT´=0,26 W/(m²K)
  • Annual final energy requirement  Qe=34,7 kWh/(m²a)
  • HT´ 52% better compared to Energy Saving Ordonance
  • QP 24% better compared to Energy Saving Ordonance


Work with Residents

Refurbishment while being occupied. Special challenge for planning, construction management and construction companies.


Funding

Partly KfW financed, DENA model project "Low-energy house model for existing buildings.


Thermal Insulation

Outside wall ETICS with 20 cm EPS insulation U = 0.15W/(m2K), Insulation of basement ceiling 16 cm EPS with flanking insulation of inside and outside walls. Outside basement wall perimeter insulation with 20 cm XPS insulation until 1 m under the surface. Insulation for roofs: replacement of the wooden rafter roof by EPS tapered insulation U = 0.10W/(m2K).


Air Tightness

Foil sealing, insulated attic cantilever with external channel. Installation of controlled exhaust system with fans on the roof surface, ventilation window opening.


Windows and Shading

Passive house windows Uw 0.71 with triple glazing Ug = 0,50, G-value 51% - Wooden fireproof glazing in the stairwell with F30 glass.


Ventilation

Exhaust air system with heat recovery.


Heating and Hot Water

Central heating with district heat (88 % cogeneration). New installation of hot water distribution in all bathrooms while being inhabited. Distribution of warm water and heating in separate trains with insulation according to Energy Saving Ordonance. Replacement of the old gas boilers one apartment after another, transfer station with calorimeter and fire resistant collar for each apartment. Hydraulic balance. Thermal solar installation with tube collectors on the roof surface for support of hot water production.


Solar Thermal

Thermal solar installation with tube collectors on the roof surface for hot water production.


Main Results

Lessons learned

Additional Information

Ms Ingrid Vogler
GdW Bundesverband deutscher Wohnungs-und Immobilienunternehmen e.V.
E-mail: vogler@gdw.de
Web: www.gdw.de