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.=

Answered: Image /qna-images/answer/25848ea6-bd7f-44a0-ac84-c46ceb4e8676.jpg

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

See similar textbooks

Similar questions

Help me answer letter A.
20-16 Consider the situation where all 250,000,000 gasoline-powered vehicles in the United States, each of which is driven an average of 20,000 km per year and requires an average of 0.55 MJ/km from the batteries, would be replaced with PEM-fuel cell vehicles that use hydrogen produced by electrolysis using electricity generated by 1-GWe nuclear power plants (operating at a 70% capacity factor). How many new nuclear power plants would need to be constructed to accommodate this increase in electricity demand?
An engineer was tasked with evaluating a heat and power generation unit for an aluminium smelting plant. The management intends to expand the production facilities to meet growing demand for aluminium. The plan involves increasing the energy intensive smelting line from the present single line to three lines by end of 2022. To support the expansion plan, the company plans to install a self-sufficient power generation unit. Details of the energy requirement and the proposed power generation unit is given the following Table. Item Power requirement per smelting processing line 0.6 MW Proposed power generation unit: Supplier • System Description Mitsubishi Heavy Industries Ltd Steam power plant (Carnot heat engines principles) 35% • Overall thermal efficiency Prepare a mini technical power evaluation report for the above project. Your report should include the following items and in the following order: a. Total power (W) and heat (Q) requirement.
Describe what a "heated zone" is, how it works, and any limitations that may apply to it.
Fluid in which shear stress is not directly proportional to the rate of shear strain is a.Non-Newtonian fluid b.Ideal plastic fluid c.Newtonian fluid
thermodynamic2
Give an example of the Resistance Factor?