1 / 7

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

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

klevy
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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Effects different insulating materials have on heat transfer through exterior house walls Tim Doot and Sabin Gautam

  2. Wall Detail

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

More Related