6. A house wall consists of a 10 cm thick layer of brick (𝜅 = 0.68 𝑊𝑚−1𝐾
−1
), a 15 cm
thick layer of fiberglass insulation (𝜅 = 0.038 𝑊𝑚−1𝐾
−1
), and a 1 cm thick layer of
gypsum board (𝜅 = 0.48 𝑊𝑚−1𝐾
−1
). The interior surface temperature is 22℃ and exterior
surface temperature is 5 ℃.
(a) What is the overall R-value of this wall?
(b) What is the heat flux through this wall?
a)
b)
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