Changes to Part L and the implications
for heavyweight buildings
                                         Tom De Saulles
 ...
Heat loss from
                                an average UK home
400                            400
             heat los...
Heat loss from
                                   an average UK home
                  400
                               ...
BRE Innovation Park




                      Brookwood farm, Woking
                      September 2010.
               ...
Currently being updated
for Part L 2010, 2013
& 2016.
Meeting 2010, 2013
                                        targets for Part L1
                            1. No additiona...
Meeting 2010, 2013
                                       targets for Part L1
                                       (deta...
Meeting 2010, 2013
                                         targets for Part L1
                                         (...
Flue gas heat recovery               Waste water heat recovery
(about £600 for smaller dwellings)   (from about £200)

• Z...
Meeting 2010, 2013
                                targets for Part L1
                                (detached house)


...
Meeting 2010, 2013 & 2016
                                targets for Part L1
                                (detached ho...
WWHR = waste water heat recovery                     ■ 2016 zero carbon fabric spec.                                      ...
Main findings

Part L1 2010 compliance:

• U-value for external walls, around 0.2 – 0.25 W/m2K
• Air permeability, around ...
Main findings

Part L1 2010 compliance:

• U-value for external walls, around 0.2 – 0.25 W/m2K
• Air permeability, around ...
Main findings

Part L1 2010 compliance:

• U-value for external walls, around 0.2 – 0.25 W/m2K
• Air permeability, around ...
Introduction of thermal mass into Part L1



                       Measured by the ‘K-value’      (KJ/m2/K)




         ...
How much thermal mass
do floors and walls have?




Sandwich panel,       Solid masonry,       Brick & block,      Woodcre...
Arup/Concrete Centre thermal properties tool
Heating season: daytime
Sun at midday
17º - 40º




     South




                    Heating season: night-time
What difference can thermal mass
                              make in SAP 2009?



EXAMPLE:
Highly insulated, airtight se...
New full fill insulation system




Achieves a U-value of 0.17 - 0.18 with a 100mm cavity
Summertime performance / overheating

                       • The Zero Carbon Hub is calling for
                        ...
Summertime performance / overheating

                       • The Zero Carbon Hub is calling for
                        ...
Free passive design tool (currently under development)
Part L2 (2010)
New drivers for passive cooling
 • 25% reduction in emissions required by Part L2
Part L2 (2010)
New drivers for passive cooling
 • 25% reduction in emissions required by Part L2
 • 23% increase in the as...
Part L2 (2010)
New drivers for passive cooling
 • 25% reduction in emissions required by Part L2
 • 23% increase in the as...
Part L2 (2010)
New drivers for passive cooling
 • 25% reduction in emissions required by Part L2
 • 23% increase in the as...
Part L2 (2010)
New drivers for passive cooling
 • 25% reduction in emissions required by Part L2
 • 23% increase in the as...
Flat slab with natural ventilation   Coffered slab & underfloor ventilation




Hollowcore slab (Termodeck®)         Water...
Manchester University
                                                Business School
                                    ...
Woodland Trust HQ, Lincolnshire
Completion: Autumn 2010
Architect: Feilden Clegg Bradley
Key messages:
• Compliance with Part L1 in 2010, 2013 & 2016 does not present any
  particular issues for masonry/concrete...
Key messages:
• Compliance with Part L1 in 2010, 2013 & 2016 does not present any
  particular issues for masonry/concrete...
Key messages:
• Compliance with Part L1 in 2010, 2013 & 2016 does not present any
  particular issues for masonry/concrete...
Key messages:
• Compliance with Part L1 in 2010, 2013 & 2016 does not present any
  particular issues for masonry/concrete...
Key messages:
• Compliance with Part L1 in 2010, 2013 & 2016 does not present any
  particular issues for masonry/concrete...
Thank you


tdesaulles@concretecentre.com
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Changes to Part L and heavyweight buildings

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Changes to Part L and heavyweight buildings

  1. 1. Changes to Part L and the implications for heavyweight buildings Tom De Saulles The Concrete Centre Specifying Low Carbon Buildings Southbank Centre 7 October 2010
  2. 2. Heat loss from an average UK home 400 400 heat loss (W/K) 300 300 200 200 Base year 100 100 0 0 1970 1970 2002 2006 2002 2010 2006 2013 2010 2016 2013
  3. 3. Heat loss from an average UK home 400 +275% heat loss (W/K) 300 200 Base year 100 0 1970 2002 2006 2010 2013 2016
  4. 4. BRE Innovation Park Brookwood farm, Woking September 2010. Code level 5, ICF construction. (William Lacey Group)
  5. 5. Currently being updated for Part L 2010, 2013 & 2016.
  6. 6. Meeting 2010, 2013 targets for Part L1 1. No additional features (detached house) 2. Weather comp. 3. Weather comp. + WWHR 2010 (25%) 2013 (44%) 2016 (70%) 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR +Basic fabric spec. FGHRS + PV (1kWp) Walls: 0.25, floor: 0.18, roof: 0.13 windows: 1.5, air permeability: 5.0 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) Y-value: 0.08 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 % improvement over Part L 2006
  7. 7. Meeting 2010, 2013 targets for Part L1 (detached house) 1. No additional features 2. Weather comp. 2010 (25%) 2013 (44%) 2016 (70%) 3. Weather comp. + WWHR Basic fabric spec. Walls: 0.25, floor: 0.18, roof: 0.13 4. Weather comp. + WWHR + FGHRS windows: 1.5, air permeability: 5.0 Y-value: 0.08 Enhanced fabric spec. 5. Weather comp. + WWHR + FGHRS + PV (1kWp) Walls reduced to 0.2 Y-value reduced to 0.05 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 % improvement over Part L 2006
  8. 8. Meeting 2010, 2013 targets for Part L1 (detached house) 2010 (25%) 2013 (44%) 2016 (70%) 1. No additional features Basic fabric spec. 2. Weather comp. Walls: 0.25, floor: 0.18, roof: 0.13 windows: 1.5, air permeability: 5.0 Y-value: 0.08 3. Weather comp. + WWHR Enhanced fabric spec. Walls reduced to 0.2 4. Weather comp. + WWHR + FGHRS Y-value reduced to 0.05 Govt. fabric energy efficiency spec. 5. Weather comp. + WWHR + FGHRS + PV (1kWp) Walls: 0.18, windows: 1.4, floor: 0.18 roof: 0.13 air permeability: 3.0, Y-value: 0.05. 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 % improvement over Part L 2006
  9. 9. Flue gas heat recovery Waste water heat recovery (about £600 for smaller dwellings) (from about £200) • Zenex Gas Saver • Recoh-vert • Ravenheat Energy Catcher • Recoh-tray • Alpha Flowsmart • Enviroharvest • Warmit (AK Industries),
  10. 10. Meeting 2010, 2013 targets for Part L1 (detached house) + Waste water heat recovery 2010 (25%) 2013 (44%) 2016 (70%) 1. No additional features Basic fabric spec. 2. Weather comp. 3. Weather comp. + WWHR Enhanced fabric spec. 4. Weather comp. + WWHR + FGHRS Govt. fabric energy efficiency spec. 5. Weather comp. + WWHR + FGHRS + PV (1kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 % improvement over Part L 2006
  11. 11. Meeting 2010, 2013 & 2016 targets for Part L1 (detached house) + Waste water heat recovery 2010 (25%) 2013 (44%) 2016 (70%) + Flue gas heat recovery features 1. No additional Basic fabric spec. 2. Weather comp. 3. Weather comp. + WWHR Enhanced fabric spec. 4. Weather comp. + WWHR + FGHRS Govt. fabric energy efficiency spec. 5. Weather comp. + WWHR + FGHRS + PV (1kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 % improvement over Part L 2006
  12. 12. WWHR = waste water heat recovery ■ 2016 zero carbon fabric spec. ■ Enhanced 2016 zero carbon fabric spec. FGHR = Flue gas heat recovery Part L: 2010 (25%) 2013 (44%) 2016 (70%?) Flat, mid-storey 1. No additional features (50m2) 2. Weather comp. 3. Weather comp. + WWHR 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR + FGHRS + PV (1kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 % reduction in CO2 emission over Part L1A 2006 End terrace, 1. No additional features 2-storey (61 m2) 2. Weather comp. 3. Weather comp. + WWHR 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR + FGHRS + PV (1kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 % reduction in CO2 emission over Part L1A 2006 Mid terrace, 1. No additional features 2-storey (61m2) 2. Weather comp. 3. Weather comp. + WWHR 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR + FGHRS + PV (1kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 % reduction in CO2 emission over Part L1A 2006 End terrace, 1. No additional features 3-storey (125m2) 2. Weather comp. + 100mm cylinder insulation 3. Weather comp. + 100mm cylinder insulation + WWHR 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR + FGHRS + PV (1 kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 % reduction in CO2 emission over Part L1A 2006 Mid terrace, 1. No additional features 3-storey (125m2) 2. weather compensator + 100mm cylinder insulation 3. Weather comp. + 100mm cylinder insulation + WWHR 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR + FGHRS + PV (1 kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 % reduction in CO2 emission over Part L1A 2006 Detached, 1. No additional features 2-storey (127m2) 2. weather comp. + 100mm cylinder insulation 3. Weather comp. + 100mm cylinder insulation + WWHR 4. Weather comp. + WWHR + FGHRS 5. Weather comp. + WWHR + FGHRS + PV (1kWp) 6. Weather comp. + WWHR + FGHRS + PV (2 kWp) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 % reduction in CO2 emission over Part L1A 2006
  13. 13. Main findings Part L1 2010 compliance: • U-value for external walls, around 0.2 – 0.25 W/m2K • Air permeability, around 5 m3/(h.m2) • Renewables are not necessary, but enhancements to services are.
  14. 14. Main findings Part L1 2010 compliance: • U-value for external walls, around 0.2 – 0.25 W/m2K • Air permeability, around 5 m3/(h.m2) • Renewables are not necessary, but enhancements to services are. Part L1 2013 compliance: • Renewables can still be avoided, but a much higher level of fabric performance is needed. • Alternatively, could use 2010 fabric performance and about 1 kW of PV.
  15. 15. Main findings Part L1 2010 compliance: • U-value for external walls, around 0.2 – 0.25 W/m2K • Air permeability, around 5 m3/(h.m2) • Renewables are not necessary, but enhancements to services are. Part L1 2013 compliance: • Renewables can still be avoided, but a much higher level of fabric performance is needed. • Alternatively, could use 2010 fabric performance and about 1 kW of PV. Part L1 2016 compliance: • Need to meet or exceed the Govt. fabric energy efficiency standard. 2 - 3 kW of PV also needed.
  16. 16. Introduction of thermal mass into Part L1 Measured by the ‘K-value’ (KJ/m2/K) This is the thermal capacity of the first 100mm, or up to the first insulating layer, if this occurs first. 100mm
  17. 17. How much thermal mass do floors and walls have? Sandwich panel, Solid masonry, Brick & block, Woodcrete block, Hemcrete block, Insulating clay block, Up to 230 kJ/m2K Up to 190 kJ/m2K Up to 190 kJ/m2K Up to 145 kJ/m2K Up to 135 kJ/m2K Up to 65 kJ/m2K Frame construction Frame construction Block partition, Stud partition, Hollow core Beam & block 2 x plasterboard, 1 x plasterboard, Up to 100 kJ/m2K Up to 9 kJ/m2K upper floor, up to upper floor, up to Up to 18 kJ/m2K Up to 9 kJ/m2K 120/160 kJ/m2K 120/40 kJ/m2K Timber upper floor, Insitu-concrete Beam & block Timber ground floor, up to 9/18 kJ/m2K ground floor, ground floor, up to 20 kJ/m2K up to 140 kJ/m2K up to 110 kJ/m2K
  18. 18. Arup/Concrete Centre thermal properties tool
  19. 19. Heating season: daytime Sun at midday 17º - 40º South Heating season: night-time
  20. 20. What difference can thermal mass make in SAP 2009? EXAMPLE: Highly insulated, airtight semi-detached house with efficient heating and controls. RESULT: • Moving from low to high thermal mass reduces emissions by about 3-4% • This is roughly the same as changing the external wall U-value from 0.2 to 0.15
  21. 21. New full fill insulation system Achieves a U-value of 0.17 - 0.18 with a 100mm cavity
  22. 22. Summertime performance / overheating • The Zero Carbon Hub is calling for an improved overheating check that must be passed by all new homes.
  23. 23. Summertime performance / overheating • The Zero Carbon Hub is calling for an improved overheating check that must be passed by all new homes. • The check should take account of future climate change. • It should also take proper account of night cooling and thermal mass.
  24. 24. Free passive design tool (currently under development)
  25. 25. Part L2 (2010) New drivers for passive cooling • 25% reduction in emissions required by Part L2
  26. 26. Part L2 (2010) New drivers for passive cooling • 25% reduction in emissions required by Part L2 • 23% increase in the assumed CO2 emissions from electricity (Part L1 and L2)
  27. 27. Part L2 (2010) New drivers for passive cooling • 25% reduction in emissions required by Part L2 • 23% increase in the assumed CO2 emissions from electricity (Part L1 and L2) • New limits for solar gain in Part L2
  28. 28. Part L2 (2010) New drivers for passive cooling • 25% reduction in emissions required by Part L2 • 23% increase in the assumed CO2 emissions from electricity (Part L1 and L2) • New limits for solar gain in Part L2 • 25 - 60% increase in the cost of electricity expected by 2016 (Ofgem)
  29. 29. Part L2 (2010) New drivers for passive cooling • 25% reduction in emissions required by Part L2 • 23% increase in the assumed CO2 emissions from electricity (Part L1 and L2) • New limits for solar gain in Part L2 • 25 - 60% increase in the cost of electricity expected by 2016 (Ofgem) • Possible relaxation of peak internal temperature in BCO specification (from 22°C to 25°C)
  30. 30. Flat slab with natural ventilation Coffered slab & underfloor ventilation Hollowcore slab (Termodeck®) Water-cooled slab
  31. 31. Manchester University Business School Completion: 2011 Architect: Feilden Clegg Bradley Precast, lattice girder floors with integral water cooling pipes.
  32. 32. Woodland Trust HQ, Lincolnshire Completion: Autumn 2010 Architect: Feilden Clegg Bradley
  33. 33. Key messages: • Compliance with Part L1 in 2010, 2013 & 2016 does not present any particular issues for masonry/concrete housing.
  34. 34. Key messages: • Compliance with Part L1 in 2010, 2013 & 2016 does not present any particular issues for masonry/concrete housing. • Heat recovery systems can help with 2010 and 2013 compliance and avoid the need for costly renewables.
  35. 35. Key messages: • Compliance with Part L1 in 2010, 2013 & 2016 does not present any particular issues for masonry/concrete housing. • Heat recovery systems can help with 2010 and 2013 compliance and avoid the need for costly renewables. • SAP now includes thermal mass, and shows a year-round round benefit in highly insulated and airtight heavyweight dwellings.
  36. 36. Key messages: • Compliance with Part L1 in 2010, 2013 & 2016 does not present any particular issues for masonry/concrete housing. • Heat recovery systems can help with 2010 and 2013 compliance and avoid the need for costly renewables. • SAP now includes thermal mass, and shows a year-round round benefit in highly insulated and airtight heavyweight dwellings. • The dwelling overheating check in SAP is likely to be revisited.
  37. 37. Key messages: • Compliance with Part L1 in 2010, 2013 & 2016 does not present any particular issues for masonry/concrete housing. • Heat recovery systems can help with 2010 and 2013 compliance and avoid the need for costly renewables. • SAP now includes thermal mass, and shows a year-round round benefit in highly insulated and airtight heavyweight dwellings. • The dwelling overheating check in SAP is likely to be revisited. • There is likely to be a move from air-conditioning to passive cooling solutions in many new, non-domestic buildings.
  38. 38. Thank you tdesaulles@concretecentre.com

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