Hannover-Kronsberg a housing-area with very far going aspects
of sustainability
Slide 2
The presentation: 1.The Kronsberg-Housing-Area an overview
2.Far going aspects of a sustainable development: Waste Energy
Rainwater The presentation: 1.The Kronsberg-Housing-Area an
overview 2.Far going aspects of a sustainable development: Waste
Energy Rainwater
Slide 3
9 km from the city centre 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 The Kronsberg
Settlement
Slide 4
Approx. 80% of building land owned by the City Overall concept
enforced through clauses in land sale contracts and planning
permission contract Kronsberg Settlement
Slide 5
Approx. 50% subsidised housing 2,700 units in 3 5-storey
apartment houses 300 2-storey private terraced houses
Slide 6
Waste
Slide 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.!
Slide 8
Great potential for commercial waste reduction
Slide 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.)
Slide 10
Construction Waste Preventive waste management planning on
building sites Result at Kronsberg: 86% pre-sorting of waste and
recyclables
Slide 11
Soil Management Result at Kronsberg: 700,000 m 3 excavated soil
re-used, making about 100,000 lorry journeys unnecessary and thus
saving 1,200 tonnes of CO 2 emissions
Slide 12
organics commercial waste construction waste bulky waste
household waste sewage sludge street sweepings City of Hannover
Waste Treatment Concept ca. 100,000 t/a waste to energy since 2005
ca. 100,000 t/a biological treatment since 2006 landfill ca. 70,000
t/a ca. 25,000 ca. 5,000 ca. 35,000 compost ca. 35,000 t/a ca.
5,000 ca. 3,000 ca. 215,000 t/a mechanical residual waste treatment
ca. 100,000 ca. 70,000 ca. 100,000 ca. 15,000 ca. 69,000 t/a ca.
1,000 t/a ca. 51,000 t/aca. 38,000 t/aca. 90,000t /aca. 15,000
t/aca. 16,000 t/a slag ca. 25,000 t/a recyclables ca. 20,000 t/a
ca. 70,000 t/a composted hazardous waste landfill ca. 3,000
t/a
Slide 13
Treatment Concept for Residual Waste 2/3 incineration 1/3
biological treatment (fermentation) Use of landfill gas at the
central dump and methane from a waste fermentation plant (approx.
15,000 MWh/a)
Slide 14
Energy
Slide 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
Slide 16
Successes with Renewable Energy Within the city area: 466
registered solar thermal units, total area 4,500m 209 solar
electricity units, total 1,600 KWpel capacity Exploitation of the
hydro-electric potential of Hannovers 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
Slide 17
CO 2 Reduction at Kronsberg CO 2 reduction: 60%! With the
windmills 80% CO 2 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%)
Slide 18
Walls: 15 - 20 cm Roofs: 18 - 25 cm Heating energy demand:
Average 56 kWh/m 2 and year Optimised Insulation
Slide 19
Only 5% more expensive than new-build developments with
district heating connections elsewhere in the city Decentral
cogeneration heating plant Compulsary connection to the network
District Heating
Slide 20
Wind Energy Two MW-class wind turbine generators in the
countryside meeting the electricity needs of 3,000 homes
Successful, and no protests from local citizens!
Slide 21
The Next Step: Passive Houses Domestic electricity Ventilation
electricity Hot water Heating from... To End energy index kWh/ (ma)
over 90% reduction compared to old housing stock
Slide 22
Energy consumption just 15 kWh/m 2 p.a. Target met! Residents
very satisfied 1998: pilot project of 32 Passive Houses at
Kronsberg
Slide 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 / m a
Optimised solar gain Blower door test
Slide 24
In der Rehre planned development of 300 detached Passive
Houses
Slide 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
Slide 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. 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.
Slide 27
Modernisation in 2004 Rented apartment house to Passive House
Standard: Auf dem Hollen, Hannover
Slide 28
Rainwater Management
Slide 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
Slide 30
Rainwater Concept at Kronsberg Natural water balance
retained
Slide 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
Slide 32
(Mulden-Rigolen) Infiltration Trench Systems
Slide 33
Flat roofs grassed wherever possible Minimising built-up areas
Remarkable positive commitment by planners
Slide 34
Ponds Water as a design element in the inner courts Diverse
planning and landscaping solutions Infiltration and
evaporation
