Kelly Kissock PhD PE Department of Mechanical and Aerospace Engineering University of Dayton Industrial Assessment Center Minimize Surface Area ACT 2 House Effect of Framing Bridges on Interior Wall Temperatures ID: 513287
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Slide1
Energy Efficient Walls
Kelly Kissock, Ph.D., P.E.Department of Mechanical and Aerospace EngineeringUniversity of Dayton Industrial Assessment CenterSlide2
Minimize Surface Area
ACT2 HouseSlide3
Effect of Framing Bridges on Interior Wall TemperaturesSlide4
2x4 and 2x6 Frame WallsSlide5
Truss and Beam with Wet-Blown Cellulose
1996 ASHRAE Technology AwardSlide6
Structural Insulated Panels (SIPs)Slide7
SIP Thermal Resistances
Whole-wall effective R (hr-ft
2
-F/Btu) for 4.5-in SIP and frame wallsSlide8
Strawbale Houses
Low embodied energySlide9
Strawbale HouseSlide10
Steel Framing
Steel conducts heat over 300 times faster than woodEmbodied Energy (2,000-square-foot house, EBN):Steel: 53 mmBtuWood: 42 mmBtuUse phase 48-92 mmBtu/yr (EPA)
Thermal resistance (JTM):
Rwood is 22% greater than RsteelSlide11
ASHRAE Correction Factors for Metal Framing
Example
Correction Factor for wood framing ~
0.90Slide12
Insulated / Uninsulated Walls
Tint,ins = 74 F
Tint,unins = 64 FSlide13
Insulated / Uninsulated WallsSlide14
Wood and Brick FramingSlide15
Cellulose Insulation RetrofitsSlide16
Closed-cell P
olyurethane Spray-on Foam InsulationAll closed-cell polyurethane foam insulation made today is produced with a non-CFC (chlorofluorocarbon) gas as the foaming agent.
PU foam is
water-vapor permeable
remains flexible
fire resistant
provides
good air
sealing
R-3.6 to R-6.5 per inch thickness
Soy-based
, polyurethane liquid
spray-foam
also
available.