42. (Ill) Suppose the insulating qualities of the wall of
Chapter 14, Problem 42(choose chapter or problem)
42. (Ill) Suppose the insulating qualities of the wall of a house come mainly from a 4.0-in. layer of brick and an R-19 layer of insulation, as shown in Fig. 1419. What is the total rate of heal loss through such a wall, if its total area is 240 ft2 and the temperature difference across it is 12 P?
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