P110_2008_Week_5

P110_2008_Week_5 - Sources for first article summary Choose...

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Sources for first article summary Choose one energy/climate related article from either: Sept. 2006 Scientific American or July 2008 Physics Today http://www.libraries.iub.edu/index.php?pageId=92 (Swain library website)
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Swain Hall West- 2 nd Floor Swain Hall Library http://www.libraries.iub.edu/index.php?pageId=92
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Chapter 5 Home Energy Cons . Thermal Resistance: Q/ t = k A T/L =: A T/R R:= L/ k This is useful because it folds in both the material property ( k ) and the thickness of the insulating layer ( L ), AND if you combine layers, then the thermal resistances ( R ) simply add, as shown on the next slide.
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R-value for a typical wall See table 5.2 in H&K for typical values of building materials
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Some typical R values Material Thickness R (ft 2 .h. o F/Btu) Hardwood 1” 0.81 Concrete block 8” 1.25 1-pane window 0.125” 0.88 2-pane window 0.5” air 1.72 Fiberglass 7” 21.8 Polyurethane 1” 6.3 Nylon carpet 1” 2.0 Wood siding 0.5” 0.81 Plywood 0.5” 0.627 Plasterboard 0.5” 0.45 Steel 1” 0.0032
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Infiltration Q/ t = 0.018 Btu/ft 3 .F o V K T Here K is the number of “Air exchanges per hour” and V is the interior volume
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This note was uploaded on 01/20/2012 for the course P 110 taught by Professor Baxter during the Fall '08 term at Indiana.

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P110_2008_Week_5 - Sources for first article summary Choose...

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