mitigated by replacing a window containing a single pane of glass with (a) double-pane low-E insulating glass or (b) a 3-inch-thick sheet of expanded polystyrene sheet? The quoted R values for these items are: • single pane of glass: 0.90 ft 2 hr ° F/Btu, • double pane of low-E insulating glass: 2.3 ft 2 hr ° F/Btu, • 1-inch-thick sheet of polystyrene sheet: 4.0 ft 2 hr ° F/Btu.
mitigated by replacing a window containing a single pane of glass with (a) double-pane low-E insulating glass or (b) a 3-inch-thick sheet of expanded polystyrene sheet? The quoted R values for these items are: • single pane of glass: 0.90 ft 2 hr ° F/Btu, • double pane of low-E insulating glass: 2.3 ft 2 hr ° F/Btu, • 1-inch-thick sheet of polystyrene sheet: 4.0 ft 2 hr ° F/Btu.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.2P: 1.2 The weight of the insulation in a spacecraft may be more important than the space required. Show...
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Question
3.6
Heat losses through windows in buildings are substantial. What would be the percentage
reduction in heat loss that would be mitigated by replacing a window containing a single
pane of glass with (a) double-pane low-E insulating glass or (b) a 3-inch-thick sheet of
expanded polystyrene sheet? The quoted R values for these items are:
• single pane of glass: 0.90 ft 2
hr ° F/Btu,
• double pane of low-E insulating glass: 2.3 ft 2
hr ° F/Btu,
• 1-inch-thick sheet of polystyrene sheet: 4.0 ft 2
hr ° F/Btu.
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