order to increase the thermal resistance of a typical exterior frame wall, such
ID: 1717943 • Letter: O
Question
order to increase the thermal resistance of a typical exterior frame wall, such as the one shown in Example 11.11, it is customary to use 2X6 studs instead of 2 X4 studs to allow for placement of more insulation within the wall cavity. Atypical exterior Q x 6) frame wall of a house consists of the materials shown in the accompanying figure. Assume an inside room temperature of 68oF and an outside air temperature of 20degreeF with an exposed area of 150 fee. Determine the heat loss drought this wall.Explanation / Answer
Heat loss is resisted by the series arrangement of items given. It can be considered as an electrical resistance analogy in which resistances are placed in series.
Total effective resistance = 0.17+0.81+4.32+19.0+0.45+0.68 = 25.43 h.ft2 F/Btu
Voltage difference in the electrical analogy is equal to the temperature difference here.
Temeperature difference = 68 - 20 = 48 F
Heat loss per unit area = Temperature difference / Total effective resistance = 48 / 25.43 = 1.88 Btu/ft^2 h
Heat loss = Heat loss per unit area x Area = 1.88 x 150 = 283.13 Btu/h
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