**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…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.33P

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Draw the thermal circuit for heat transfer through a double-glazed or a double-paned window. Identify each of the circuit elements. Include solar radiation to the window and interior space.
1.77 Explain each in your own words. (a) What is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) What are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature?
2.50 Compare the rate of heat flow from the bottom to the top of the aluminum structure shown in the sketch below with the rate of heat flow through a solid slab. The top is at v, the bottom at . The holes are filled with insulation that does not conduct heat appreciably.
1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of material are available. One has a maximum usable temperature of 1040°C and a thermal conductivity of 1.7 W/(m K), and the other has a maximum temperature limit of 870°C and a thermal conductivity of 0.85 W/(m K). The bricks have the same cost and are laid in any manner, but we wish to design the most economical wall for a furnace with a temperature of 1040°C on the hot side and 200°C on the cold side. If the maximum amount of heat transfer permissible is 950 , determine the most economical arrangement using the available bricks.
As the temperature differential across a panel increases, A. the rate of heat transfer through the panel will increase. B. the rate of heat transfer through the panel will decrease. C. the rate of heat transfer through the panel will remain unchanged since the temperature difference does not affect the rate of heat transfer.
1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
The heat conducts through the shape below. The temperature of the right face is 93 °C, while the left face is at 23 °C. If the top and bottom faces are completely insulated, and the thermal conductivity of the material decreases with decreasing temperature. * Assume that the thermal conductivity is 100 at 23, decreased to 10 at 93. A) Sketch the temperature profile inside the plate. B) If both sides of the plate in the above problem is exposed to air: Left side (h = 20 W/m2K, TL = 20 °C) and right side (h = 90 W/m2K). Calculate the temperature of the air on the right side.
To find the thermal conductivity of a material, the following experimental setup can be prepared. Two long cylinders that are identical in terms of manufacturing are prepared. One of them is of a known thermal conductivity value kA while the other is for an unknown material kB. Both cylinders are attached to a heat sink of a fixed temperature Tb and they are exposed to a fluid (typically ultra-cooled for accuracy purposes). The temperature measurements are taken along some distance (x1) away from the base. If the first measurements reads 65 C for a distance (x1) of 12 mm while the second material reads 54 C for the same distance. What is the thermal conductivity of the second material (B).Knowns: material A is made of copper. k = 390 W/m.k. Tb = 130 C, Tinf = 12 C.
The below shown graph is drawn from the tabulated values of brass which we measured during the experiment of thermal conductivity: (Consider the value of heater power (Q') and the area of cross section (A) of the material from the tabulated values) X-axis 1 unit = 1cm vaxis 1 unit s'c 70- 20- 10- Distance of the test point from the hot end in centimeter Calculate the following: Thermal conductivity of brass Calculated Value quantities Difference in temperature (AT) C° (with sign) Difference in distance between test points (Ax) cm Slope from the graph °C/m (with sign) Thermal conductivity of brass kp W/m°C
The heat loss per hour through 1 square foot of furnace wall 18” thick is 520 Btu’s. The inside wall temperature is 1900ᵒF, and its average thermal conductivity is 0.65 Btu/hr-ftᵒF. Find the outside wall temperature
25- c) A plane wall is having width ‘b’ mm and height 4 times of its width. The wall thickness is 120 mm. the thermal conductivity is 18 W/mK. The surface temperatures are at 700oC and 200o C The heat flow across the plane wall is 746 W Calculate the width, height and area of the wall?
Hello. Can you please help answer the question shown in the photo? It is a 3-part question which I have attempted many times. I was able to calculate the correct answer for part 2, but part 1 and part 3 still says I am incorrect. Please show how to properly solve the problem. The topic is heat transfer. Thank you.

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