Engineer Building Facilities

Practice session

A composite exterior wall consists of 100 mm reinforced concrete [conductivity k = 1.6 W/(m·K)], 100 mm insulation board [k = 0.034 W/(m·K)], and 20 mm interior gypsum plaster [k = 0.20 W/(m·K)]. The indoor surface film resistance is R_si = 0.11 (m²·K)/W and the outdoor surface film resistance is R_se = 0.04 (m²·K)/W. What is the total thermal resistance (R_tot) of the wall?

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