Your SlideShare is downloading. ×
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
North carolina 2 jan 2009
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

North carolina 2 jan 2009

168

Published on

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

  • Be the first to like this

No Downloads
Views
Total Views
168
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1.
    • Thermal performance
    • and building codes
  • 2. Thermal performance
    • λ wall mix is 0.0697W/m.k
    • R-value of 12” wall is 24
    • R-value of 20” wall is 40
    • Depending on finishes/framing
  • 3. Hygro-thermal properties
    • Hemcrete ® does not behave like a lightweight insulation material
    • The latent heat of water phase changes within the material contribute to its performance
  • 4. Thermal mass
    • Hemcrete ® has the lowest diffusivity of any material
    • It is slow to change temperature
    • This gives it a thermal inertia like a high thermal mass material
  • 5. Diffusivity ( λ / ρ c )
    • Expanded polystyrene ≈ 18.4 x 10 -7 m 2 /s
    • Mineral fibre ≈ 14.4 x 10 -7 m 2 /s
    • Polyisocyanurate ≈ 5.7 x 10 -7 m 2 /s
    • Polyurethane ≈ 5.6 x 10 -7 m 2 /s
    • Brick ≈ 4.1 x 10 -7 m 2 /s
    • AAC ≈ 3.0 x 10 -7 m 2 /s
    • Insulating aerated blocks ≈ 2.3 x 10 -7 m 2 /s
    • Timber ≈ 1.6 x 10 -7 m 2 /s
    • Hemcrete ® ≈ 1.4 x 10 -7 m 2 /s
    • Water (10 o C) ≈ 1.4 x 10 -7 m 2 /s
  • 6. Dynamic thermal performance
  • 7. -> 187 Q 24h [kJ/m 2 ] -> 146 -> 410 -> 229 ( Cement concrete -> 3163 )
  • 8. Effective U-value of 250mm Hemcrete ®
    • 187,000 J/m 2 lost in 24 hours
    • 1W = 1J/s
    • There are 86,400 seconds in 24 hours
    • The temperature difference was 20 o C
    • Real heat loss was 0.11W/m 2 k
    • Theoretical U-value is 0.29W/m 2 k
  • 9. Amplitude suppression and phase displacement
  • 10. Dampening factor Time shift at 25 cm at 25 cm  25cm = 1-(  25cm /  init )  25cm = t max,25cm - t max,init [-] [h] Material ______________________________________________ LHC – “Wall” mixture 98,5 15 Wood 98,8 16 Cellular concrete 95 10,5 Mineral wool 77,5 6 CEM concrete 89,5 7
  • 11. Air-tightness
    • The monlithic nature of Hemcrete ® makes it inherently air tight
    • There are no complicated details/junctions
    • Figures below 2m 3 /m 2 /hr at 50 pascals are achievable
  • 12. Comfort and Health
    • High vapour permeability and absorption coefficicient allow Hemcrete ® to buffer high humidity, combat condensation and improve air quality
    • Low effusivity makes Hemcrete ® walls feel wall and make the internal environment feel comfortable
  • 13. Thermal bridging
    • The timbers within a Hemcrete ® wall do not behave as thermal bridges.
    • This gives Hemcrete ® a significant advantage over most other construction materials
  • 14. Thermal bridging
    • U-value of a 500mm Hemcrete ® wall (ignoring the timber frame) is 0.134 W/m 2 .K
    • Including 15% timber framing reduces the
    • U-value to 0.137 W/m 2 .K
    • Difference is 0.003 W/m 2 .K
    • Rounding error is bigger than this difference
  • 15. The Lime Technology Office
  • 16. Before
  • 17.  
  • 18.  
  • 19. Sprayed Hemcrete ®
  • 20. Spray Limetec ® render
  • 21. The finished office
  • 22.  
  • 23. External recorded temperature – April to September 2007
  • 24. Addition of 24hourly average external temperature trend line
  • 25. Existing offices (monitored June onward) showing high internal temperature swing
  • 26. By comparison, the Hemcrete offices show a low internal temperature swing, which is characteristic of heavyweight structures.
  • 27.  
  • 28.  
  • 29.  
  • 30. The finished office
  • 31.  
  • 32.  
  • 33. Tradical ® Hemcrete ®
    • Good thermal conductivity – 0.07 W/m.K
    • No thermal bridging
    • Low diffusivity
    • Low effusivity
  • 34. Structure
    • Tradical ® Hemcrete ® is not a structural material. The structural requirements are performed by the frame.
    • The Hemcrete ® stiffens the frame
  • 35. Tradical ® Hemcrete ® is non structural
  • 36. ModCell Hemp
            • Modular panel
            • Typically 3m x 2m
            • Fast-track construction
            • Off-site construction
            • Can be structural
  • 37. Fire Safety
    • Tests have been carried out at the CSTB in France
    • 250mm thick wall constructed of blocks made from Tradical ® Hemcrete ®
    • The mortar joints failed after 1hr 40 mins
    • UK tests on a solid panel have run for 3hrs 45 mins
    • Full testing to run in February 2009
  • 38.  
  • 39.  
  • 40.  
  • 41.  
  • 42.  
  • 43.  
  • 44. The best way to predict the future, is to create it !

×