A Wall Is Constructed of a 2 Inch Layer of Fiberglass

question 12

Multiple Choice

A wall is constructed of a 2 inch layer of fiberglass board (R = 8) and six inches of fiberglass batting (R = 19) . If the temperature on the outside surface of the fiberglass board is 50°F and the temperature on the inside surface of the fiberglass batting is 68°F, what is the temperature (in °F) at the interface? (The units of R are ft²⋅°F⋅h/BTU.)

• A) 62
• B) 58
• C) 55
• D) 65
• E) 52

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