2.1 A composite wall shown below has uniform temperatures. You are given that the thermalconductivities of the wall materials are: ka = 70 W/m.K, ka = 60 W/m.K, kc = 40 W/m.K, andko = 20 W/m.K. With this information you are required to(i) Determine the rate of heat transfer through this section of the wall and(ii) The temperatures at the interfaces. (Note the surfaces normal to heat transfer direction areisothermal).TAS = 200°CTos = 50°Cв 3 стA3 ст46 cm4 cm2 cm 2.5 cm2.2 There are several factors that have a direct bearing on the thermal conductivity value. Listfour factors other than the actual material properties that affect thermal conductivity.6 cm

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Answered: 2.1 A composite wall shown below has…

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 5:Assume steady-state, one-dimensional heat conduction through the symmetric shape shown in Figure 1.Assuming that there is no internal heat generation, derive an expression for the thermal conductivity k(x) for these conditions: A(x) = (1 -x), T(x) = 300(1 - 2x -x3),and q = 6000 W, where A is in square meters, T in kelvins, and x in meters. Consider x= 0 and 1
A wall consists of a layer of wood and a layer of cork insulation of the same thickness. The temperature inside is 34.0°C, and the temperature outside is 0.0°C. The thermal conductivity of wood is 0.130 W/(m·K) and the thermal conductivity of cork is 0.0460 W/(m·K). A) What is the temperature at the interface between the wood and the cork if the cork is on the inside and the wood on the outside? in C B) What is the temperature at the interface if the wood is on the inside and the cork is on the outside? in C C) It doesn’t matter whether the cork is placed on the inside or the outside of the wooden wall because the temperature at the interface differs for the two cases.the temperature at the interface differs for the two cases. the temperature at the interface is the same for the two cases.the temperature at the interface is the same for the two cases. the total thermal resistance is the same for the two cases.the total thermal resistance is the same for the two cases.…
A multilayer wall has a thermal resistance of 0.0058 ° C/ W in the inner layer, 0.28 ° C/ W in the middle layer and 0.18 ° C/ W in the outer layer. The total temperature difference across the wall is 70 ° C. a. Find the heat flow through the wall (per unit area). b. If we increase the heat resistance in the middle layer up to 0.48 ° C/ W, then there will be a relative change in the heat flow if the temperature difference remains unchanged. Please answer as a percentage (%) of the heat flow in item a).
The composite wall of an oven consists of three materials, two of which are ofknown thermal conductivity, kA = 25 W/m ⋅ K and kC = 60 W/m ⋅ K, and knownthickness, LA = 0.40 m and LC = 0.20 m. The third material, B, which is sandwichedbetween materials A and C, is of known thickness, LB = 0.20 m, but unknownthermal conductivity kB. Under steady-state operating conditions, measurementsreveal an outer surface temperature of Ts,o = 20°C, an inner surface temperature ofTs,i = 600°C, and an oven air temperature of T∞ = 800°C. The inside convection coefficient h is known to be 25 W/m2 ⋅K. Neglecting convection transfer effect,what is the value of kB?
1. The two faces of a thin metal sheet that is 3 units wide and 5 units long are insulated, and the sheet is so thin that the heat flow inside of it is essentially two-dimensional. The bottom edge is kept at zero degrees, and the top edge is kept at fifty degrees. The vertical edges are insulated. Determine the temperature distribution throughout the sheet in a steady state.
For aesthetic purposes, you are to fit a metal rod into a stainless-steel hole for your house's design. The hole is 9.988 mm in diameter. If the rod is to be heated so that it will fit into the hole, what will be the temperature in °C? Assume: Your house's temperature is 25°C The length of the rod is around 10 mm. Linear coefficient of the metal rod is 4.5×10-6°C and for the stainless steel is 16×10-6°C
Problem 4 A cork board (k = 0.039W/m K) 3 cm thick is exposed to air with an average temperature T.. = 30°C with a convection heat transfer coefficient, h = 25 W/m².K. The other surface of the board is held at a constant temperature of 15°C. A volumetric heat generation of 5 W/m³ is occurring inside the wall. Assuming one dimensional conduction, write the governing equation and express the boundary conditions for the wall. (solve the equation is not required) Problom
(Q4) A 4m x 6m wall consists of 4 glass windows of 2m x 1.5m dimensions. The wall has thickness of 0.13m and a thermal conductivity of 0.5 W/m.K, while the glass windows are 6 mm thick with a thermal conductivity of 1.228 W/m.K. The values of intemal and external surface conductance for the wall (including glass) are 7.8 W/m? K and 34.4 W/m².K, respectively. The intemal and extemal temperatures are 22° C and 42°C, respectively. Calculate the total heat transfer rate through the wall. What percentage of this heat transfer is through the windows?
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1. A wall 2 cm thick is to be constructed from material that has an average thermal conductivity of 1.3 W/m C. The wall is to be insulated with material having an average thermal conductivity of 0.35 W/m C, so that the heat loss per square meter will not exceed 1830 W. Assuming that the inner and outer surface temperatures of the insulated wall are 1300 and 30 C, calculate the thickness of insulation required.
Exercise 2.3:Assume that the thermal conductivity of copper is four times that of brass. Two metalrods made of copper and brass are each 20 cm long and 2.0 cm in diameter. The rods are placed end to end. The free end of the copper rod is maintained at 1000C and the free end of the brass rod is maintained at 00C. (i) What is the equilibrium temperature at the copper-brass junction? |(ii)If the thermal conductivity of copper is 390 J/m0C, at what rate, in watts, does heat flow through the rods
Hi, can you solve this problem for me please ? The lesson name is Heat Transfer. I did not solve. Thanks!

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