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(Solution Download) A dormitory at a large university, built 50 years ago, has exterior walls constructed of L s =...

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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/m? K. 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  -20°C, respectively. The inner and outer convection heat transfer coefficients are  and ho = 25 W/m2 ?K, respectively.

 

 







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This question was answered on: Oct 24, 2017

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