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Energy Efficient Walls

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.

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Energy Efficient Walls

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

  2. Minimize Surface AreaACT2House

  3. Effect of Framing Bridges on Interior Wall Temperatures

  4. 2x4 and 2x6 Frame Walls

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

  6. Structural Insulated Panels (SIPs)

  7. SIP Thermal Resistances Whole-wall effective R (hr-ft2-F/Btu) for 4.5-in SIP and frame walls

  8. Strawbale Houses • Low embodied energy

  9. Strawbale House

  10. 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 48-92 mmBtu/yr (EPA) • Thermal resistance (JTM): • Rwood is 22% greater than Rsteel

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

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

  13. Insulated / Uninsulated Walls

  14. Wood and Brick Framing

  15. Cellulose Insulation Retrofits

  16. 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-foamalso available.

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