Client:
aha waste management, Hannover region
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Karl-Wiechert-Allee, Hannover
Description
The Region of Hannover's association for waste management planned to construct a 4-story social and office building on its central business premises. The Z-shaped building's front structures create orientation towards the northern entrance area and towards the heavily trafficked recycling center to the south. The diagonal connecting section marks out broad open spaces on the ground floor in front of the common area and the side entrance. The ground floor has a business unit with social rooms and a common area; work plans are distributed there in the mornings as well. The greened terraces help improve the microclimate on the premises, which are largely sealed off for work-related reasons. The building's interior holds two utility service shafts which lead to the communication zones. These provide spaces for employees to stop and have short conversations. The Z-shaped floor plan creates two zones on each of the four stories; this helps ensure that departments or subject areas are arranged together in groups rather than being scattered along a long hallway.
Parties involved
Design and planning:
SchröderArchitekten
S3 Sasse|Stein|Sasse
S3 Sasse/Stein/Sasse
Energy concept and HVAC planning:
Architektur- und TGA-Büro Grobe Passivhaus
Building data
Building type:
Social and office building
Location:
Hannover-Buchholz-Kleefeld
Year of construction:
2011-2012
Units:
120 office workspaces;
social area for 125 employes
Heated usable space:
circa 3.835 m²
Subsidies:
proKlima
Building shell
Exterior walls:
Sand-lime brick masonry with 26 cm insulation and brick veneers; HTC = 0.12 W/(m2K)
Windows:
Heat-insulating triple-glazed windows in insulated frames; HTC = 0.73 W/(m2K); Contacts on the windows automatically shut off the heating when the windows are opened, ensuring that open windows do not significantly increase building energy consumption.
Roof:
Concrete roof with sloped insulation and roof sealing; green roof construction above locker rooms; HTC = 0.11 W/(m2K)
Floor Plate:
35 cm layer of cellular glass insulation under the floor plate; HTC = 0.15 W/(m2K)
Ceiling blocking outside air:
Reinforced concrete ceiling with 26 cm insulation on underside; floating floor screed over footfall sound insulation on top side; HTC = 0.10 W/(m2K)
Summertime heat protection:
Sun protectors outside east-, west-, and south-facing windows
Daylight usage:
Daylight tubes direct light into building interior; artificial light regulated by daylight
Building technology
Ventilation:
Two comfort-ventilation systems with heat recovery:
>> Ventilation system for office areas on Floors 2-4 as well as parts of ground floor; supply air vents mounted in ceiling cano pies; air outlet valves not visible above ceiling canopies
>> humidity-controlled ventilation system for social areas containing showers and changing rooms Both systems are set to building hours in order to avoid unnecessary energy consumption at times when building is not in use.
Heating:
Heat supply via a district heating connection; heat distributed in office areas via heated supply air only; floor heating system distributes heat in social areas
Air conditioning:
Nighttime cooling via ventilation system; Absorption refrigeration system, heating via district heating network
Calculated values
Calculated method: Passivhaus planning package
HEATING ENERGY NEEDS:
15 kWh/(m2a)
TOTAL ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
District heating
52 kWh/(m2a)
Electricity
39 kWh/(m2a)
PRIMARY ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
122 kWh/(m2a)
CO2 EMISSIONS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
29 kg/(m2a)
