Zero Carbon and SAP

611 views

Published on

An update on SAP, Code and Part L requirements and proposed updates. SAP assessments in detail, and SAP case studies for Part L compliance, Code for Sustainable Homes levels 4 and 5 (zero carbon).

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
611
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • .
  • It is also interesting to note that the emission reduction targets are set out by house type, with semi and detached dwellings having to meet higher targets than flats and mid terraces. If you are interested, there is more detail on the zero carbon hub website or the consultation can be responded to on the DCLG website.
  • Zero Carbon and SAP

    1. 1. SAPs in Detail and Getting to Zero Carbon <ul><li>Preparing for Zero Carbon Seminar </li></ul><ul><li>February 2011 </li></ul><ul><li>Claire Westron </li></ul><ul><li>Rund Partnership Ltd </li></ul>
    2. 2. <ul><li>Code for Sustainable Homes </li></ul><ul><li>Planning Policy requirements </li></ul><ul><li>Building Regulations Part L </li></ul><ul><li>SAP </li></ul><ul><li>Case studies </li></ul>
    3. 4. Local Authority Planning Policy Southampton – Code Level 4 and 20% Eastleigh – Code Level 4 and 15% energy from renewable sources New Forest – Code Level 3 (4 from April 2012) Bournemouth – Code 3 (from Summer 2012) Winchester – “Policy Aspiration” Code Level 5 (Energy and Water sections only)
    4. 5. <ul><li>What is the future for Part L? </li></ul>Reduction in Carbon emissions over Part L 2006 Reduction in Carbon emissions over Part L 2010 Revisions to Part L Code Level 3  25% - 2010 Code Level 4  44%  25% 2013 Code Level 5  100  100% 2016
    5. 6. <ul><li>Zero carbon </li></ul><ul><li>2016 zero carbon new homes policy includes only the emissions covered by Building Regulations (heating, fixed lighting, hot water and building services) </li></ul><ul><li>Emissions from cooking or from plug-in appliances will not be addressed as part of this policy. </li></ul><ul><li>Zero Carbon Hub </li></ul><ul><li>www.zerocarbonhub.org </li></ul>
    6. 7. Part L Consultation
    7. 9.         What are the main factors affecting the SAP assessment? Dwelling size, type and orientation U-values Thermal mass Thermal bridging Air Pressure Test Ventilation Heating, hot water and controls New technologies
    8. 10.         Thermal Bridging <ul><li>Where two heat loss elements meet, there is the potential for heat to be lost via increased conduction </li></ul><ul><li>Repeating e.g. timber studs dealt with in the U value calculation </li></ul><ul><li>Non repeating </li></ul><ul><li>3 possible specifications: </li></ul><ul><li>Default y = 0.15 </li></ul><ul><li>All details conform to Accredited Construction Details </li></ul><ul><li>SAP 2005 - default y = 0.08 </li></ul><ul><li>SAP 2009 - y value to be calculated by assessor </li></ul><ul><li>3. Details conform to another Government Approved Source </li></ul>
    9. 12.         Air Pressure Test <ul><li>Test all dwellings </li></ul><ul><li>example – 3 bed semi </li></ul>Air pressure test TER DER % improv 4 18.52 18.26 + 1.4% 6 18.52 19.35 - 4.5%
    10. 14.         Ventilation <ul><li>Key points </li></ul><ul><li>SAP 2009 rewards MVHR less than SAP2005, making it easier to achieve compliance with natural ventilation </li></ul><ul><li>There is a huge variation in efficiencies of MVHR systems </li></ul><ul><li>Where air tightness is better than 5, additional background ventilation is needed </li></ul><ul><li>Where as built air tightness is better than 3 the ventilation strategy needs to be checked </li></ul>
    11. 15.         Heating and Hot Water <ul><li>Gas / oil / biomass boilers </li></ul><ul><li>Heat pumps </li></ul><ul><li>Solar thermal panels </li></ul><ul><li>Secondary heating e.g. wood burning stoves </li></ul>
    12. 16.         New technologies <ul><li>Shower Heat Recovery Unit </li></ul><ul><li>Photovoltaics </li></ul><ul><li>Flue Gas Heat Recovery </li></ul><ul><li>Wind turbines </li></ul><ul><li>Hydro power </li></ul>
    13. 17. Case studies 1. 2 bedroom flat 2. 3 bedroom semi detached house 3. 4 bedroom detached house
    14. 18. Type : 2 bed flat (57m 2 ) Part L Code 4 Code 5 (2016) U values Walls Roof Floor Windows 0.19 0.11 n/a 1.4 As Part L As Part L Ventilation MVHR MVHR MVHR (improved efficiency) Air pressure test 5 5 3.5 Thermal bridging Accredited Construction Details Accredited Construction Details Accredited Construction Details Heating and hot water Gas combi boiler Air Source Heat Pump Communal biomass boiler to block Renewable None None 0.7kWp PV
    15. 19. Type : 3 bed semi (85m 2 ) Shower Heat Recovery Unit Improved hot water cylinder insulation Enhanced Construction Details 3 MVHR (improved efficiency) 0.20 0.11 0.15 1.3 Code 4 Part L Code 4 Code 5 (2016) U values Walls Roof Floor Windows 0.22 0.12 0.15 1.4 As Part L 0.20 0.11 0.15 1.3 Ventilation MVHR MVHR MVHR (improved efficiency) Air pressure test 4 4 3 Thermal bridging Accredited Construction Details Accredited Construction Details Enhanced Construction Details Heating and hot water Gas system boiler Gas system boiler Improved hot water cylinder insulation Renewable None 1kWp PV 3kWp PV system
    16. 20. Type : 4 bed detached (125m 2 ) Part L Code 4 Code 5 (2016) U values Walls Roof Floor Windows 0.24 0.17 0.17 1.4 As Part L As Part L Ventilation Natural Natural Natural Air pressure test 7 7 7 Thermal bridging Accredited Construction Details Accredited Construction Details Accredited Construction Details Heating and hot water Gas system boiler Gas system boiler Biomass boiler (wood pellets) Renewable None 1.2kWp PV 1.6kWp PV
    17. 21. <ul><li>Future changes to SAP </li></ul><ul><li>Thermal bridging - 19 more junctions to consider </li></ul><ul><li>Degree of pipe insulation </li></ul><ul><li>Changes to carbon emission factors </li></ul><ul><li>Revisions to solar radiations (changing outputs from PV and solar thermal) </li></ul><ul><li>Lower default efficiencies for heat pumps </li></ul>
    18. 22. <ul><li>Claire Westron </li></ul><ul><li>Code for Sustainable Homes and SAP Assessor </li></ul><ul><li>email: [email_address] tel: 023 8062 3750 </li></ul>

    ×