In order to increase the thermal resistance of
a typical exterior frame wall, such as the one
shown in Example 11.8, it is customary to use
60 mm × 180 mm studs instead of 60 mm ×
120 mm studs to allow for placement of more
insulation within the wall cavity. A typical
exterior (60 mm × 180 mm) frame wall of
a house consists of the materials shown in
the accompanying figure. Assume an inside
room temperature of 20° C and an outside air
temperature of −12° C with an exposed area
of 15 m2
. Determine the heat loss through
this wall.