The Wall of a House Consists of Three Layers: a Wooden

question 20

Multiple Choice

The wall of a house consists of three layers: a wooden outer wall with an R factor of 1.0,a 3-in layer of fiberglass insulation with an R factor of 11,and a gypsum-board inner wall with an R factor of 0.33 (all R factors are in h · ft² · Fº/Btu) .When the temperature is 68ºF inside the house and - 4.0ºF outside,what is the rate of heat loss through an 8-ft by 15-ft section of this wall?

• A)700 Btu/h
• B)780 Btu/h
• C)5.8 Btu/h
• D)130 Btu/h
• E)350 Btu/h

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