A dormitory at a large university, built 50 years ago, has exterior walls constructed of Ls = 32-mm-thick sheathing with a thermal conductivity of ks = 0.2 W/m · K. To reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an Li = 35-mm-thick layer of extruded insulation characterized by ki = 0.021 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 = 1.1 W/m · K. Determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are T∞,i = 20°C and T∞,o = -5°C, respectively. The inner and outer
A dormitory at a large university, built 50 years ago, has exterior walls constructed of Ls = 32-mm-thick sheathing with a thermal conductivity of ks = 0.2 W/m · K. To reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an Li = 35-mm-thick layer of extruded insulation characterized by ki = 0.021 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 = 1.1 W/m · K. Determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are T∞,i = 20°C and T∞,o = -5°C, respectively. The inner and outer convection heat transfer coefficients are hi = 6 W/m2 · K and ho = 27 W/m2 · K, respectively
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