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

Hannover-Kronsberg a housing-area with very far going aspects of sustainability. The presentation: The Kronsberg-Housing-Area an overview Far going aspects of a sustainable development: Waste Energy Rainwater. The Kronsberg Settlement. 1995 Start of development planning

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

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

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

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

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

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

  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 • Two MW-class wind turbine generatorsin 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. 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 1950-1970) 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 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) www.hans-moenninghoff.de

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