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Cornhill Estates. A Poundbury based development company that specialises in sustainable and energy Efficient development.We build approximately 100 Units per annum (residential/office/retail/leisure). Almost all our homes are built to a BREEAM EcoHomes Excellent standard and incorporate renewable
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26 September 2007
Kim Slowe, Cornhill Estates Low/Zero Carbon Homes A Developers Perspective
2. Cornhill Estates A Poundbury based development company that specialises in sustainable and energy Efficient development.
We build approximately 100 Units per annum (residential/office/retail/leisure).
Almost all our homes are built to a BREEAM EcoHomes Excellent standard and incorporate renewable technologies
3. A Cornhill Estates venture to provide sustainable solutions to developers, house builders, self builders and home owners
A one stop shop for:
Project design
Cost effective solutions
Advice based on experience
Architectural design
EcoHomes assessment
Supply of technologies
Full range of technologies
High stock levels
Installation of technologies
National chain of installers
Single warranty
4. Some Past Projects
5. Parkside - Poundbury
5 Houses and 6 Apartments
EcoHomes Excellent
Rainwater Harvesting
Photovoltaic Roof tiles
Solar Water Heating
Heat Recovery Ventilation
Sheeps Wool Loft Insulation
7. Upton, Northampton
204 Units to EcoHomes Excellent
Rain Water Harvesting to all houses
Solar Heating to All Houses
Green Roofs to Apartments
25 Units with Photovoltaics
Heat Recovery Ventilation
SUDS
14. Code for Sustainable Homes Graded Code 1 Code 6
Broadly based on the earlier BREEAM EcoHomes scheme
Codes 1-3 can generally be achieved without renewables.
Code 4 and above require renewables.
Does not take account of thermal mass and summer overheating.
Modern Methods of Construction required to achieve the zero carbon Codes 5/6.
15. Code Categories Energy
Water
Materials
Surface Water Runoff
Waste
Pollution
Health and Well Being
Management
Ecology
16. Energy Code 1 - 10% improvement over Building Regulations
Code 2 - 18% improvement over Building Regulations
Code 3 - 25% improvement over Building Regulations
Code 4 - 44% improvement over Building Regulations
Code 5 - 100% improvement over Building Regulations
(heating lighting-hot water)
Code 6 - Zero Carbon including appliances
17. Minimising Requirement for Heat & Electricity Building orientation
Solar gain
Suitability of the building for renewable technologies
Terraces versus detached
Insulation
Wall/floor/window construction/design
Wall thickness
Window design
Thermal mass of the building
Low energy lighting and appliances
Rainwater harvesting
Drying spaces
Utility rooms
Showers instead of baths
18. All new homes in England will have to be carbon neutral by 2016
19. Renewable Technologies Wind
Solar Photovoltaic
Solar Thermal
Ground Source Heat Pumps
Biomass Boilers
Combined Heat & Power
20. Wind Turbines
Wind turbines start at 400 watts and go up to many megawatts
Only work when the wind blows
Not easily installed on houses
Work better when at the top of tall towers
Do not like turbulent air
Can be noisy
21. Micro Wind Turbines
23. Solar Photovoltaics You need at least a 6 KW array on a 4 bedroom house for the house to be self sufficient for electricity
Cost prohibitive at typically 30K+
Most UK homes can only fit 2 KWs on their roofs
The roof has to be within
45 degrees of South
25. Solar Thermal Relatively inexpensive to install
Can meet all of a homes summer hot water needs
Can only meet a small percentage of winter hot water needs
Does not meet a homes central heating requirements
Has to be installed within 45 degrees of South
27. Ground Source Heat Pumps Need a large plot for the collector
Borehole collectors are much more expensive
Work best with under floor heating Need electricity to make them work
Expensive to install
28. Biomass Heating Relatively cheap to install
Biomass boilers need space for the hopper
Most work on wood pellets which can be hard to get
Not maintenance free
29. Combined Heat and Power Domestic combined heat and power systems are not reliable and run on gas
District CHP systems are large, expensive and still relatively unreliable
Difficult balance between heat output and electrical output
30. Zero Carbon - Poundbury New scheme starting spring 2008
15 apartments, 7 houses, 3 office suites
Zero carbon
Traditional architecture
Electricity from a regional biomass CHP plant
Heat from wood pellet stoves with back boilers
Construction method to be determined at a seminar in late October
31. Zero Carbon - Poundbury
32. Zero Carbon - Poundbury
33. Zero Carbon - Poundbury
34. The Cost of Code for Sustainable Homes level 3 Typical 280,000 3 bedroom home
Wall Construction to 0.22 U-value 3,000
Additional window insulation 2,000
Additional floor/loft insulation 1,000
FSC timber etc. NIL
Dual Flush Loos/Spray taps 100
Bicycle stowage 300
Recycling facilities 100
A rated appliances NIL
Home Offices 100
Drying Space 20
Efficient Heating System NIL
Low energy Lighting 100
Recycling of site waste 1,000
Total Cost - 7,720 (3% of sale price)
35. Technology Costs Technologies reduce Carbon Dioxide emissions and reduce the need for energy generated from fossil fuels.
They are not essential to achieve Code 3 or lower but are required for Code 4 and above.
Typical additional developer technology costs on a 4 bedroom new build:
Rainwater Harvesting 2,300 (up to 55% of water usage)
Vacuum Tube Solar Heating 3,000 (Up to 80% hot water needs)
Photovoltaic Roof System 7,000 (with 50% grant) (Up to 50% electricity needs)
Heat Recovery Ventilation 2,300
Micro CHP 1,000 (Up to 30% electricity needs)
Wind Turbine 1,500 - 3,000 (Up to 70% electricity needs)
Sheeps Wool Loft Insulation 600
Heat Pump - 10,000 (1 unit of electricity produces 4 units of heat)
Wood Pellet Boiler - 3,500 (Saves over one third on heating bills)
36. Architecture and Zero Carbon Settlements
38. Questions ?