P110_2008_Week_5

# P110_2008_Week_5 - Sources for first article summary Choose...

This preview shows pages 1–7. Sign up to view the full content.

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)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Swain Hall West- 2 nd Floor Swain Hall Library http://www.libraries.iub.edu/index.php?pageId=92
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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
R-value for a typical wall See table 5.2 in H&K for typical values of building materials
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 01/20/2012 for the course P 110 taught by Professor Baxter during the Fall '08 term at Indiana.

### Page1 / 13

P110_2008_Week_5 - Sources for first article summary Choose...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online