Effects different insulating materials have on heat transfer through exterior house walls
This presentation is the property of its rightful owner.
Sponsored Links
1 / 7

Effects different insulating materials have on heat transfer through exterior house walls PowerPoint PPT Presentation


  • 50 Views
  • Uploaded on
  • Presentation posted in: General

Effects different insulating materials have on heat transfer through exterior house walls. Tim Doot and Sabin Gautam. Wall Detail. Thermal Resistance of wall components. Gypsum Sheathing - (13 mm) - 0.079 K·m 2 /W Gypsum Wallboard - (50 mm) - 0.085 K·m 2 /W

Download Presentation

Effects different insulating materials have on heat transfer through exterior house walls

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Effects different insulating materials have on heat transfer through exterior house walls

Tim Doot and Sabin Gautam


Wall Detail


Thermal Resistance of wall components

  • Gypsum Sheathing - (13 mm) - 0.079 K·m2/W

  • Gypsum Wallboard - (50 mm) - 0.085 K·m2/W

  • Brick Veneer - (100 mm) - 0.66 K·m2/W

    Insulation materials

  • Fiberglass/cellulose insulation - (90 mm)- 11.2 K·m2/W

  • Mineral Wool insulation - (90 mm) - 10.85 K·m2/W

  • Sprayed foam insulation - (90 mm) - 15.75 -> 22.75 K·m2/W


Total heat transfer Equation

  • Q = -A·(ΔT/Rtot)

  • Toutside = -7°C

  • Tinside = 20°C

  • Thermal Resistance (R) = L/K·A

  • Rtot = Rbrick + Rsheathing +Rinsulation +Rwallboard

  • Rtot = 0.66 K·m2/W + 0.079 K·m2/W + Rinsulation + 0.085 K·m2/W

  • Rinsulation (Fiberglass)= 12.024 K·m2/W

  • Rinsulation (Mineral Wool)=11.674 K·m2/W

  • Rinsulation (Sprayed Foam)=16.574 -> 23.574 K·m2/W


Heat transfer for different insulations

  • Fiberglass/Cellulose

    • Q = 27 K/12.024 K·m2/W

    • Q = 2.25 W/m2

  • Mineral Wool

    • Q = 27 K/11.674 K·m2/W

    • Q = 2.31 W/m2

  • Sprayed Foam

    • Q = 27 K/(16.574 K·m2/W) –> 27/(23.574 K·m2/W)

    • Q = 1.63 -> 1.15 W/m2


Conclusions

  • The calculations show that the sprayed foam insulation can be up to twice as effective as the fiberglass insulation in reducing heat transfer through an exterior house wall

  • It would be worth it to spend the extra 30% in costs to install the sprayed foam insulation and save on energy costs than to install the fiberglass insulation for a reduced initial cost


References

  • http://www.gobrick.com/BIA/technotes/t28_files/image001.jpg

  • http://www.american-sprayfoam.com/residental

  • http://www.fao.org/docrep/006/y5013e/y5013e08.htm


  • Login