Calculate the thermal conductivity of the insulating material, and also determine the insulation thickness of R-30 and R-40 materials.

Question

A double-pane glass window consists of two pieces of glass, each having athickness of 8 mm, with a thermal conductivity of k = 1.4 W⁄m ⋅ K . The twoglass 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 , determinethe 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:

Answer 1

Question

Chapter 11, Problem 8P

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Calculate the thermal conductivity of the insulating material, and also determine the insulation thickness of R-30 and R-40 materials.

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