Energy Efficient Walls Kelly Kissock, Ph.D., P.E. Department of Mechanical and Aerospace Engineering University of Dayton Industrial Assessment Center.

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Presentation transcript:

Energy Efficient Walls Kelly Kissock, Ph.D., P.E. 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

2x4 and 2x6 Frame Walls

Truss and Beam with Wet-Blown Cellulose 1996 ASHRAE Technology Award

Structural Insulated Panels (SIPs)

SIP Thermal Resistances Whole-wall effective R (hr-ft 2 -F/Btu) for 4.5-in SIP and frame walls

Strawbale Houses Low embodied energy

Strawbale House

Steel Framing Steel conducts heat over 300 times faster than wood Embodied Energy (2,000-square-foot house, EBN): –Steel: 53 mmBtu –Wood: 42 mmBtu –Use phase mmBtu/yr (EPA) Thermal resistance (JTM): –Rwood is 22% greater than Rsteel

ASHRAE Correction Factors for Metal Framing Example Correction Factor for wood framing ~ 0.90

Insulated / Uninsulated Walls Tint,ins = 74 F Tint,unins = 64 F

Insulated / Uninsulated Walls

Wood and Brick Framing

Cellulose Insulation Retrofits

Closed-cell Polyurethane Spray-on Foam Insulation All 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. spray-foam