Glass Air 10 mm Glass 8 mm 8 mm FIGURE 11.10 The double-pane glass window of Example 11.5.
Glass Air 10 mm Glass 8 mm 8 mm FIGURE 11.10 The double-pane glass window of Example 11.5.
Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN:9781285852225
Author:Gregory W Fletcher
Publisher:Gregory W Fletcher
Chapter6: Determining Branch Circuit, Feeder Circuit, And Service Entrance Requirements
Section: Chapter Questions
Problem 12RQ
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Question
A double-pane glass window consists of two pieces of glass, each having a
thickness of 8 mm, with a thermal conductivity of k = 1.4 W⁄m ⋅ K . The two
glass panes are separated by an air gap of 10 mm, as shown in Figure 11.10 .
Assuming the thermal conductivity of air to be k = 0.025 W⁄m ⋅ K , determine
the total R-value for this window. The total thermal resistance of the window is obtained by adding the resistance offered by each pane of glass and the air gap in the following manner:
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