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

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