Heat transfer A dormitory at a large university, built 50years ago, has exterior walls constructedof Ls 25-mm-thick sheathing with athermal conductivity of k, = 0.1 W/m.K.To reduce heat losses in the winter, theuniversity decides to encapsulate theentire dormitory by applying an L₁ = 25-mm-thick layer of extruded insulationcharacterized by k, = 0.029 W/m.K tothe exterior of the original sheathing. Theextruded insulation is, in turn, coveredwith an Lg = 5-mm-thick architecturalglass with kg = 1.4 W/m.K. Determinethe heat flux through the original andretrofitted walls when the interior andexterior air temperatures are Too,i = 22°Cand To, = -7.5°C, respectively. The innerand outer convection heat transfercoefficients are h₁ = 5 W/m².K and h₂ =25 W/m².K, respectively.=

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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 L¡ = 25- mm-thick layer of extruded insulation characterized by k; = 0.029 W/m.K to ki 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∞0,0 = -7.5°C, respectively. The inner and outer convection heat transfer coefficients are h; = 5 W/m² K and ho = 25 W/m².K, respectively.

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 L¡ = 25- mm-thick layer of extruded insulation characterized by k; = 0.029 W/m.K to ki 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∞0,0 = -7.5°C, respectively. The inner and outer convection heat transfer coefficients are h; = 5 W/m² K and ho = 25 W/m².K, respectively.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Heat transfer

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 k, = 0.1 W/m.K.
To reduce heat losses in the winter, the
university decides to encapsulate the
entire dormitory by applying an L₁ = 25-
mm-thick layer of extruded insulation
characterized by k, = 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 Too,i = 22°C
and To, = -7.5°C, respectively. The inner
and outer convection heat transfer
coefficients are h₁ = 5 W/m².K and h₂ =
25 W/m².K, respectively.
=

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