Energy Efficient Walls - PowerPoint Presentation

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Energy Efficient Walls
Energy Efficient Walls

Energy Efficient Walls - Description

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 Download Presentation


framing walls insulated foam walls framing foam insulated energy polyurethane insulation steel house strawbale thermal spray cell correction tint closed frame wall

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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


-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


Correction Factor for wood framing ~


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


good air


R-3.6 to R-6.5 per inch thickness


, polyurethane liquid




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