The outside walls of a house are constructed of a 4-in. layer of brick, 1/2 in. of celotex, an air space in: thick, and 1/4 in. of wood panelling. If the outside surface of the brick is at 30°F and the inner surface of the panelling at 75°F, what is the heat flux if
a. the air space is assumed to transfer heat by conduction only?
b. the equivalent conductance of the air space is 1.8 Btu/h ft2 °F?
c. the air space is filled with glass wool?
kbrick = 0:38 Btu/h ft °F
kcelotex = 0.028 Btu/h ft °F
kair = 0.015 Btu/h ft °F
kwood = 0.12 Btu/h ft °F
kwool = 0.025 Btu/h ft °F
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