Engineering, 23.10.2019 17:00 autumnskye1

Adormitory at a large university, built 50 years ago, has exterior walls constructed of 25-mm-thick sheathing with a thermal conductivity of 0.1 w/mk. to reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an 25-mm-thick layer of extruded insulation characterized by 0.029 w/mk to the exterior of the original sheathing. the extruded insulation is, in turn, covered with an 5-mm-thick architectural glass with 1.4 w/mk. determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are t([infinity],inside) = 22°c and t ([infinity],outside) = -17.5°c, respectively. the inner and outer convection heat transfer coefficients are 5 w/m^2k and 25 w/m^2*k, respectively.

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Adormitory at a large university, built 50 years ago, has exterior walls constructed of 25-mm-thick...

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