Question #267770

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?


1
Expert's answer
2021-11-18T10:16:51-0500

a)

R=R1+R2+R3=σ1κ1+σ2κ2+σ3κ3=4.115 m2°CW,R=R_1+R_2+R_3=\frac{\sigma_1}{\kappa_1}+\frac{\sigma_2}{\kappa_2}+\frac{\sigma_3}{\kappa_3}=4.115~\frac{m^2\cdot °C}W,

b)

Q=RΔT=70 Wm2.Q=R\Delta T=70~\frac W{m^2}.


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