1. Hannover-Kronsberg a housing-area with very far going aspects of sustainability

2. The presentation: The Kronsberg-Housing-Area an overview
Far going aspects of a sustainable development:
Waste
Energy
Rainwater

3. The Kronsberg Settlement
1995 Start of development planning
1997 Construction starts on residential buildings (around 30 different developers)
2000 Completion of approx. 3,000 homes
Reserve land to the north and south for further 3,000 homes
Excellent transport connections to the city centre
9 km from the city centre

4. Kronsberg Settlement Approx. 80% of building land owned by the City
Overall concept enforced through clauses in land sale contracts and planning permission contract

5. Kronsberg Settlement Approx. 50% subsidised housing
2,700 units in 3 – 5-storey apartment houses
300 2-storey private terraced houses

6. Waste

7. Dramatic reductions in waste quantities (1989 - 2002)
Waste avoidance (- 380,000 t)
Dumping of soil, building rubble, sewage sludge (- 340,000 t)
Recycling, composting of organic waste (+ 72,000 t)
Recycling of glass, paper, packaging and scrap metal (+ 41,700 t)
Decrease in waste-to-disposal from c. 1,000,000 to 200,000 tonnes p.a.!

8. Great potential for commercial waste reduction

9. Result at Kronsberg: Household Waste Pre-sorting
Approx. 30% reduction in waste volumes
(City: 219 kg per household p.a.,
Kronsberg: 154 kg per household p.a.)

10. Result at Kronsberg: Construction Waste
Preventive waste management planning on building sites
Result at Kronsberg:
86% pre-sorting of waste and recyclables

11. Result at Kronsberg: Soil Management
700,000 m3 excavated soil re-used, making about 100,000 lorry journeys unnecessary and thus saving 1,200 tonnes of CO2 emissions

12. City of Hannover Waste Treatment Concept
commercial waste
construction waste
household waste
organics
bulky waste
sewage sludge
street sweepings
ca. 69,000 t/a
ca. 1,000 t/a
ca. 51,000 t/a
ca. 38,000 t/a
ca. 90,000t /a
ca. 15,000 t/a
ca. 16,000 t/a
ca. 70,000 t/a composted
ca. 5,000
ca. 215,000 t/a
mechanical residual waste treatment
ca. 100,000
ca. 100,000
ca. 15,000
ca. 100,000 t/a
biological treatment
since 2006
ca. 100,000 t/a
waste to energy
since 2005
ca. 5,000
ca. 35,000
ca. 70,000
ca. 25,000
ca. 3,000
compost ca. 35,000 t/a
slag ca. 25,000 t/a
hazardous
waste landfill
ca. 3,000 t/a
recyclables ca. 20,000 t/a
landfill ca. 70,000 t/a 1 1 1

13. Treatment Concept for Residual Waste
1/3 biological treatment (fermentation)
2/3 incineration
Use of landfill gas at the central dump and methane from a waste fermentation plant (approx. 15,000 MWh/a)

14. Energy

15. Hannover - Climate Protection Region
Since 1994: municipal climate protection programme, with a specialist unit in the city administration
Since 2000: climate fund run by the municipal energy utility and the city council - 5 million € funding programme each year
Since 2001: regional climate protection agency

16. Successes with Renewable Energy
Within the city area:
466 registered solar thermal units, total area 4,500m²
209 solar electricity units, total 1,600 KWpel capacity
Exploitation of the hydro-electric potential of Hannover’s river (1.38 MW rating)
In the Hannover Region:
Approx. 225 large wind turbines, which can meet the electricity needs of around 170,000 homes
About 1,000 buildings a year retrofitted for energy efficiency

17. CO2 Reduction at Kronsberg
CO2 reduction: 60%! With the windmills 80%
CO2 emissions in %
low energy house standard
+ cogeneration heating power plant (about - 20%)
+ electricity saving (-10%)
+ two wind turbine generators each 1.5 MW (-20%)
(about -30%)

18. Optimised Insulation Walls: 15 - 20 cm Roofs: 18 - 25 cm
Heating energy demand:
Average 56 kWh/m2 and year

19. District Heating
Decentral cogeneration heating plant
Compulsary connection to the network
Only 5% more expensive than new-build developments with district heating connections elsewhere in the city

20. Wind Energy Successful, and no protests from local citizens!
Two MW-class wind turbine generators in the countryside
meeting the electricity needs of 3,000 homes
Successful, and no protests from local citizens!

21. The Next Step: Passive Houses
Domestic electricity
Ventilation electricity
Hot water
Heating from ... To
End energy index kWh/ (m²a)
over 90% reduction compared to
old housing stock

22. Target met! Residents very satisfied
1998: pilot project of
32 Passive Houses
at Kronsberg
Energy consumption just 15 kWh/m2 p.a.
Target met! Residents very satisfied

23. What makes a Passive House?
Maximum insulation (40-45 cm in walls, 30 – 40 cm in the roof)
Triple glazed reflective coating windows filled with inert gas
Comfortable ventilation system with heat recovery
Max. supplementary heating demand: 15 kWh / m² a
Optimised solar gain
Blower door test

24. ‘In der Rehre’ planned development of 300 detached Passive Houses

25. Following completion of the new-build Kronsberg settlement, a major new pilot project: ‘Concerto’
Integrated EU project –
‘Energy saving in the building stock and use of renewable energies’

26. ‘Concerto’ Aims 60-70% savings on end energy for heating
Use of renewable energies wherever possible.
Measures
Energy efficient retrofitting of multi-occupancy houses owned by several Hannover housing associations (dating from ) to a high energy efficiency standard
Use of renewable energy by conversion from coal to
biomass for the existing district heating network.

27. Rented apartment house to Passive House Standard:
‘Auf dem Hollen’, Hannover
Modernisation in 2004

28. Rainwater Management

29. Worldwide, major flooding problems from increasing sealing of infiltration areas by development
Factor 10 approach:
Where possible, total retention and infiltration within the development area

30. Rainwater Concept
at Kronsberg
Natural water balance retained

31. Intelligent Rainwater Management
Conventional construction
paved and built-up surfaces
Rainwater runs off into the sewers.
Hannover future standard
fewer sealed surfaces
permeable surfaces on e.g. car parks
groundwater infiltration
alternative flood protection measures

32. (Mulden-Rigolen)
Infiltration Trench
Systems

33. Flat roofs Minimising built-up areas
grassed wherever possible
Minimising built-up areas
Remarkable positive commitment by planners

34. Ponds Water as a design element in the inner courts
Diverse planning and landscaping solutions
Infiltration and evaporation

35. Thank you! Internet: www.hannover.de www.sibart.org
(German, English, French & Spanish)