code for sustainable homes presentation - pv...
TRANSCRIPT
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Code for Sustainable Homes
Laura Seymour
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Overview of presentation
The Code for Sustainable Homes was
introduced in April 2007. In this
presentation we discuss:
• How the Code works
• Code ratings and setting benchmarks
• Energy and renewable technologies
• Overview of other topics assessed
• Case studies
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Environmental issue categories assessed
• Energy & CO2 Emissions
• Water
• Materials
• Surface Water Run-off
• Waste
• Pollution
• Health & Well-being
• Management
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Scoring
• Ratings from 1 star to 6 star
• Rating relates to
– Percentage of overall
points awarded across 34 issues
– Whether the mandatory
requirements for different ratings have been met
• Unclassified if the minimum requirements are not met
90+6
84-895
68-834
57-673
48-562
36-471
Total percentage
points score required
Star Rating
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Example Certificate
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Setting Benchmarks
2016
2013
2010
2008
Year certain Code elements may become
mandatory1
Aspirational Practice
Aspirational Practice
Advanced Practice
Best Practice
Good Practice
Standard Practice
Current benchmarks (but rapidly changing!)
6 star
5 star
4 star
3 star
1 to 2 star
Unrated
Code Rating
1 Draft Strategy for Sustainable Construction (2007), BERR
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Approximate additional cost above Building
Regulations for achieving each Code Level
Figures are a per dwelling cost based on research carried out by English Partnerships
(A cost review of the Code For Sustainable Homes)
6
5
4
3
2
1
Code Level
-
£26,073
£15,184
£5,025
£2,326
£765
Traditional
Detached
-
£26,012
£14,726
£5,059
£2,506
£795
Traditional End
Terraced
-
£34,074
£8,297
£3,388
£2,385
£555
Traditional Low
Rise
-
£35,786
£16,953
£6,358
£3,797
£2,878
Traditional High
Rise
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Energy- Mandatory Issues
Approx. 100True zero carbonCode Level 6
56100Code Level 5
1944Code Level 4
725Code Level 3
818Code Level 2
-10Code Level 1
Additional % improvement compared to previous Code level
% Reduction in CO2 emissions required compared to Building Regs
• Definition of zero carbon: the net carbon dioxide emissions for ALL energy used in the building is zero, including energy used in cooking and to power appliances which is not covered by Building regulations.
• Note that there is an exponential increase in CO2 emissions to gain higher Code Levels:
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Reducing CO2 Emissions:Improved Building Design
1) Be LEAN- Use less energy
2) Be CLEAN- Use energy efficiently
3) Be GREEN- Use renewables
Steps 1 and 2: Improved building design
to reduce energy demand:
• Effective use of solar gain
• Low U values
• Low air permeability
• Energy efficient building services systems and controls
Potential improvement:
• Up to 20- 25% in housing using current best practice techniques
• Passiv Haus approach virtually eliminates need for heating and could
achieve up to 60% reduction
German Passiv Haus
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Reducing CO2 Emissions:Renewable and Low emission technologies
Step 3: Choose a building services strategy that will reduce or eliminate CO2 emissions
Technologies that help to reduce heating/ hot
water demand:
• Solar hot water
• Biomass boilers
• Biomass combined heat and power/ CHP
• Community heating powered by waste
Technologies that help to meet electricity (lighting/power) demand:
• Solar photovoltaics
• Wind turbines
• Biomass combined heat and power/ CHP
• Small scale hydro power
Biomass Boiler
Wind Turbine
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• ENE1 Dwelling Emission Rate: reductions in
CO2 emissions
• One of the few technologies available to provide renewable electricity, essential to gain higher Code levels
• ENE 7 Low or Zero Carbon (LZC) technologies: 1 credit awarded if 10% or 2 credits if 15% of total energy provided by LZCs.
• Need to consider solar design at an early stage. Related benefit- HW1 daylighting credit
Photovoltaics and the Code
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Energy- Non Mandatory Issues
• Low energy lighting
• PIR/ daylight sensors/ timers
on external lighting
• Provision to dry clothes naturally
• Energy labelled white goods
• Low or zero carbon technologies
• Cycle storage
• Home office
Low Energy Light Bulbs
Solar Tube Skylight
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Water
• Code Level 1 and 2: 120L/ person/ day
– Low water usage appliances
• Code Level 3 and 4: 105L/ person/ day
– Ultra-low usage appliances
– OR low water usage appliances PLUS rainwater harvesting/ greywater recycling
• Code Level 5 and 6: 80 L/ person/ day
– Ultra-low usage appliances PLUS rainwater
harvesting/ greywater recycling for toilet flushing and washing machines
• Affects aspects of living i.e. smaller baths, slower running showers and taps
• Additional credit for using rainwater for irrigation
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Materials
• Environmental impact of materials
– Green Guide to Specification 2008
– Material specifications assigned a rating from A+ to E
– Mandatory requirement that at least 3 of the 5
building elements (roof, external walls, internal walls, floors, windows) have a rating A+ to D
• Responsible sourcing of materials
– Certified timber
– Other materials from ISO14001 or EMAS accredited manufacturers
hhh
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Surface Water Run-off
• Management of surface water runoff
– Mandatory requirement that the peak rate of runoff does not increase
– Credits awarded for use of SUDs techniques to reduce runoff rates
• Flood risk
– Buildings will obtain a higher rating if they are located in a low flood risk area
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Waste
• Site Waste Management Plans for site preparation/ construction phase mandatory
– Monitor waste generated and volumes recycled
– Set targets for waste reduction
– Outline procedures for meeting these targets
• Internal and external recycling bins
• Composting
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Pollution
• Global warming potential (GWP) of insulants
• NOx emissions
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Health and Wellbeing
• Daylighting
• Sound insulation
• Private space
• Lifetime homes
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Management
• Home user guide
• Considerate Constructors Scheme
• Construction site impacts
• Security
– Secured by design
recommendations
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Ecology
• Ecological value of the existing site
• Protection of ecological features
• Ecological enhancement
• Change in ecological value of the site
• Building footprint
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Case Study: Illingworth Development
• Housing development in Halifax, West Yorkshire
• Most homes built to EcoHomes Very Good, two upgraded to CSH Level 4*
• First “saleable” Code Homes in the country to be completed
• Extra Over Cost: £14K/unit
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Case Study: Illingworth Development cont.
• 54% Improvement in CO2
emissions achieved
• 17% through fabric improvements alone
- air tightness of 5m3/hr/m2
- careful detailing
- fully insulated 300mm cavity
- low U values including Krypton filled U values
• 2.5m2 solar PV panel
• Exhaust air heat pump instead of gas boiler
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Case Study: Hanson EcoHouse
• CSH Level 4*
• High thermal mass
• Passive stack ventilation
• Ground source heat pump
• Solar hot water
• Rainwater collected for WC flushing and irrigation
• ISO14001 certified clay and concrete materials
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Case Study: Stewart Milne’s Group Sigma Home
• CSH Level 5*
• Reduction in Carbon Dioxide Emissions
• Solar Thermal Water Heating
• Photovoltaics
• Micro-wind Technologies
• Grey water recycling
• Passive Ventilation
Stewart Milne’s Group Sigma Home built at BRE Innovation
Park
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Questions
?