Client:
City of Hannover
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Im Wiesengrunde, Hannover
Description
The new daycare center replaces a long-lasting temporary solution within a former apartment building. The daycare center contains five daycare groups with in total 105 children. Vorrink-Wagner Architekten, a local architectural office, realized a two-story building with a glazed façade orientated east and west to an inner courtyard. The courtyard serves as a playground. The building shell is kept closed with minimal openings to the north and west, creating a feeling of protection from the outside world but also completing the urban building structure to its borders. The south and south-east extensive glazed façade guarantees solar energy entries in winter. Outside adjustable screens protect from solar radiation and overheat in summers. Special colored opaque door elements provide access to courtyard even in second floor, the access here is provide by an arcade. The main entrance and circulation areas are located in the north. All of the building's open areas and ground-floor rooms are fully wheelchair-accessible, and an elevator provides barrier-free access to the upper floor. The pedagogical principals follow an open concept with special subject areas or rooms like ateliers, workshoprooms, theater-rooms, library, a “snoezelen room.” The concepts contain a free choose of the activities.
Parties involved
Builder-owner:
Gesellschaft für Bauen und Wohnen Hannover mbH (GBH)
Design:
vorrink wagner architekten
Passivhaus planning:
energydesign Braunschweig
HVAC planning:
Andreas Favier GmbH
Building data
Building type:
Five-group daycare center (105 children)
Location:
Hannover-Bothfeld
Year of construction:
2010 - 2012
Heated usable space:
994 m²
Total cost:
2.3 million euro
Building shell
EXTERIOR WALLS:
Lime-sand brick masonry (17.5 cm) or reinforced concrete (24 cm) with 26 - 30 cm composite heat insulation system (thermal conductivity ? = 0.035 W/mK); HTC = 0.11 W/(m²K)
Windows:
Wood-aluminum windows or curtain wall system with heat-insulating triple glazing; HTC = approx. 0.85 W/(m²K)
Roof:
Single pitch roof (green roof) Wooden roof construction with 32-36 cm total mineral wool insulation, ? = 0.035 W/mK); HTC = 0.13 – 0.14 W/(m²K)
Floor plate:
Concrete slab (30cm) with 40 cm cellular glass insulation (? = 0.045 W/mK) on underside; floor screed over 7.5 cm total insulation (? = 0.045 W/mK) on top side HTC = 0.09 W/(m²K)
Building technology
Ventilation:
Comfort-ventilation system with heat recovery; heat distribution effectiveness = 84 %
Heating:
Space Heating: District heating (PHPP: 13 kW = 13 W/m²) DHW: Instantaneous water heater (electrical heater)
Air conditioning:
No active air conditioning. The following measures were taken to help ensure comfortable summertime building temperatures:
>> solid construction provides intermediate storage of absorbed summer heat
>> exterior sun protectors controlled via wind and sun monitors
Measured values
AIRTIGHTNESS:
n50 = 0.6 h-1
Calculated values
Calculated method: Passivhaus planning package
HEATING ENERGY NEEDS:
15 kWh/(m²a)
TOTAL ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
District Heating
16 kWh/(m2a)
Electricity
40 kWh/(m2a)
PRIMARY ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
109 kWh/(m2a)
CO2 EMISSIONS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
28 kg/(m2a)
