A dormitory at a large university, built 50 years ago, has
Chapter , Problem 3.5(choose chapter or problem)
A dormitory at a large university, built 50 years ago, has exterior walls constructed of Ls 25-mm-thick sheathing with a thermal conductivity of ks 0.1 W/mK. To reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an Li 25-mm-thick layer of extruded insulation characterized by ki 0.029 W/m K to the exterior of the original sheathing. The extruded insulation is, in turn, covered with an Lg 5-mm-thick architectural glass with kg 1.4 W/m K. Determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are T,i 22 C and T,o 20 C, respectively. The inner and outer convection heat transfer coefficients are hi 5 W/m2 K and ho 25 W/m2 K, respectively.
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