**19. ssm Two cylindrical rods are identical, except that one has a thermalconductivity k and the other has a thermal conductivity k2. As the drawingshows, they are placed between two walls that are maintained at differenttemperatures Tw (warmer) and Te (cooler). When the rods are arranged asin part a of the drawing, a total heat Q' flows from the warmer to the coolerwall, but when the rods are arranged as in part b, the total heat flow is Q.Assuming that the conductivity k, is twice as great as k, and that heat flowsonly along the lengths of the rods, determine the ratio Q'/Q.k1k2Twk2Tc TwTc(a)(b)

Given data: The temperature of the warmer wall is Tw. The temperature of the cooler wall is Tc.…

Answered: **19. ssm Two cylindrical rods are…

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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2. A glass window has an area of 5.5 ft² and a thickness of 5 mm. If one side is at a temperature of 45° F and the other is at 23 F, how much thermal energy (BTU/year) flows through the window in one year? The thermal conductivity of glass is 1.89x10-4 kcal/m-s-K.
Question 9. The following non-homogeneous heat equation Ut = 3uxx +π-x models the distribution of heat in a metal rod. Solve the equation if the initial temperature u(x, 0) = x, and the the boundary conditions are: u(0, t) = u(π, t) = 0.
A wood fire with a temperature of 1110F is at the other side of a 10 square ft wall that has a 6-inch layer of firebrick, 3-inch layer of concrete, and 6 inches of regular bricks. The thermal conductivity in Btu of each material is as follows: 0.27, 0.76, and 0.98 respectively hr-ft-° Solve for the heat conducted through this wall and the temperatures measured between the layers if the temperature at the other end of the wall is 150F?
A certain insulation has a thickness of 2 cm. What thermal conductivity in W/m • *C is necessary to effect a temperature drop of 500 *C for a heat flow of 400 W/m2?
In a glass plant in Cavite, a furnace has fire-brick walls made up of the following two materials in series : Non-corrosive brick as inner layer (material 1) Clay brick as outer layer (material 2) Thickness 4.5 inches 8 inches Thermal conductivity k1 k2 The temperature inside the furnace (inside wall surface of the non-corrosive brick) is found to be 1105 oF while the outside temperature (outside wall surface of clay brick) is 365 oF. This is not the desired temperature inside the furnace so engineers thought of lagging the furnace walls with another material to reduce heat loss. The additional lagging material consists of magnesia layer which is 2 inches thick and has a thermal conductivity of 0.04 Btu /h.ft.oF. During a test run on the furnace with the magnesia lagging material now, new temperature readings were recorded : Point of measurement Temperature reading Inside furnace (inside wall surface of non-corrosive brick 1355 oF Interface between…
4
My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to get in a sleeping bag with him to try and warm him up. What heat transfer mechanism will be most responsible for heating him up? For simplicity, ignore any internal temperature differences across my body (that is, assume my skin temperature is also 310 K). Use numbers to support your answer (for human skin, you can use the following values: surface area A = 1:50 m2, emissivity = 0:970, thickness d = 0:0250 m, thermal conductivty 0:200 JmsK)
Compute the heat transfer through the composite wall as shown in the Figure below. Consider materials of your choice from table below. Use both methods, thermal conductivity & thermal resistivity.

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