Case Study: nZEC - Energy refurbishment of 110 dwellings in Walter-Felsenstein-Str, Berlin, Germany (UNDER MONITORING)
Name of organisation: Wohnungsgenossenschaft Marzahner Tor eG
Stage of development: completed
Year of finalization: 2010
Type of project: refurbishment
Area: urban
Scale: individual buildings
Type of building: Apartment in a block of more than ten stories
Number of units/dwellings: 110
Tenure: cooperative ownership
Street: Walter-Felsenstein-Str. 17-37
Postcode: 12687
City: Berlin
Region/ County: Berlin
Country: Germany
Last Update: 14.04.2015
Short Description
In 2009/2010 the facade, roof, basement and the distribution lines were insulated. New windows and a new two-pipe-heating system were installed. Long term success: saving of approx. 45% of end energy for heating and hot water (measured in 2011, 2012, 2013). Installation of a thermal solar plant with 110 m² (1 m² per flat).
Key Elements
Monitoring
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Thermal Insulation
Thermal insulation in accordance with Energy Saving Ordinance.
Windows and Shading
New airtight windows.
Ventilation
Ventilation of bathrooms by central roof fan.
Solar Thermal
Installation of a thermal solar plant with 110 m² (1 m² per flat).
Main Results
Saving costs by reducing the agreed power input from 592 kW to 340 kW and by saving energy. Successful saving is measured over 3 years after renovation.
Successful saving of final energy: 142 kWh/m2a before and 75 kWh/m2a after measure.
Certified district heating: Primary factor fp = 0,56, saving of 1.568 t CO2 per anno compared to gas (for the whole company).
Lessons learned
If hot water is measured by heat meter (instead of calculating the heat amount from used m3), a bigger hot water amount is seen (30 % of energy use instead of 17 to 19).
Additional Information
Ms Ingrid Vogler
GdW Bundesverband deutscher Wohnungs-und Immobilienunternehmen e.V.
E-mail: vogler@gdw.de
Web: www.gdw.de
