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Voltmerstraße 38, Hannover

Description

The family center, part of Hainholz's new green central area, is a handicapped-accessible day care facility that can accommodate up to 100 children. For its additional function as a family center, it also offers a classroom, two multi-purpose rooms and an office.

The two-story building offers visitors an unobstructed view from the town square side to the garden side; the design gives the center an inviting, open feel and floods it with light. Air space in the entrance hall's central room leads to the gallery on the upper floor, creating a feeling of spaciousness. The adjacent multipurpose room can be used to expand the space if necessary. The systematically organized functional spaces provide simple, clear orientation. The windows are positioned according to the lighting needs of the interior rooms, and are partially covered by the slatted wooden outer facade. As one walks past the building, its facade appears to change along with the viewer's perspective, transforming from a purely wooden facade to a plaster facade with vertical slats.

Parties involved

Client:

Gesellschaft für Bauen und Wohnen mbh (GBH)

Design:

Architekturbüro pk nord

HVAC planning:

Ingenieurgesellschaft Grabe GmbH

Building data

Building type:

Day care and family center

Location:

Hannover-Hainholz

Year of construction:

2012

Units:

2 preschool and day care groups, 1 afterschool care group, 1 class room, 2 multipurpose rooms

Heated usable space:

1.096 m²

Subsidies:

European Regional Development Fund, RIK (Regonal Integration Concept), proKlima

Building shell

Exterior walls:

solid exterior walls with 26 cm composite thermal insulation system HTC = 0.13 W/(m²K), exterior wall on soil with 26 cm perimeter insulation HTC = 0.13 W/(m²K)

Windows:

Plastic windows with heat-insulating triple glazing; north and west windows: g-values of 0.55; south and east winows: g-values of 0.39; HTC = 0.76 W/(m²K) including installation-related heat bridges

Roof:

Flat roof with concrete ceiling and 40 cm thermal insulation; green roof construction; HTC = 0.09 W/(m²K)

Floor Plate:

22 cm thermal insulation under floor plate, 8 cm atop the floor plate; HTC=0.10 W/(m²K)

Summertime heat protection:

Sun protection glazing on south and east sides; all windows fitted with motorized exterior sun-blinds

Building technology

Ventilation:

Two highly-efficient ventilation systems with heat recovery

Heating:

Condensing gas boiler with solar-powered drinking water heating system for kitchen; electric flow heaters in sanitation areas; heat distribution via static heating elements and supply air vents

Air conditioning:

no active air conditioning

Calculated values

Calculated method: Passivhaus planning package

HEATING ENERGY NEEDS:

15 kWh/(m²a)

TOTAL ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:

Electricity

32 kWh/(m²a)

Gas

16 kWh/(m²a)

PRIMARY ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:

102 kWh/(m²a)

CO2 EMISSIONS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:

24 kg/(m²a)

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