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/m·k. 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/m·k 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/m·k. determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are [infinity] 22°c and [infinity] -2.5°c, respectively. the inner and outer convection heat transfer coefficients are 5 w/m2·k and 25 w/m2·k, respectively.