Find the total conductive thermal resistance of a 2-m long two-layered cylindrical insulation jacket as shown in the figure. The first (inner) layer is made of foam and has a thermal conductivity of 0.12 W/m-°C. The second (outer) layer is made of rubber and has a thermal conductivity of 0.27 W/m.°C. 0.176Ķ W 55 mm 40 mm 50 mm Inner Outer

Find the total conductive thermal resistance of a 2-m long two-layered cylindrical insulation jacket as shown in the figure. The first (inner) layer is made of foam and has a thermal conductivity of 0.12 W/m-°C. The second (outer) layer is made of rubber and has a thermal conductivity of 0.27 W/m.°C. 0.176Ķ W 55 mm 40 mm 50 mm Inner Outer

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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1. A pipe is covered with three insulation layers where the corresponding thicknesses are 150 mm, 250mm and 300mm and the respective thermal conductivities are 3.2 W/m°C, 2.1 W/m°C and 1.5 W/m C. The length of the pipe is 3m. The inner side of the pipe which has a diameter of 300 mm is exposed to a hot gas at 1000 °C with convection coefficient of 50 W/m2°C and the temperature of the inner side of the pipe surface is 800 °C. The air outside the pipe is at 25°C with a convection coefficient of 35 W/m2°C. a. Draw a schematic diagram which shows the heat transfer process b. Calculate the Heat transfer rate c. The overall heat transfer coefficient "U" of the system based on the inner pipe d. Temperature at each of the layers and at the outermost surface of the pipe.
The inner diameter of a pipe made of %1 C steel used in the drying machine of a textile factory is D1 = 160 mm and the thread diameter is D₂= 170 mm. The pipe is insulated with 25 mm thick glass wool. The heat transfer coefficient between the air and the pipe surface at 90 °C temperature inside the pipe is 80 W/m²K. The temperature of the ambient air outside the insulation is 20 °C and the air comes perpendicular to the cat wool surface at a speed of 10 m/s. Find the total heat transfer coefficient according to the inside diameter of the pipe. Calculate the heat transfer per unit length of pipe per unit time ?
A dormitory at a large university, built 50 years ago, has exterior walls constructed of L, = 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/mK 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 Too₁ = 22°C and T∞,0 = -20°C, respectively. The inner and outer convection heat transfer coefficients are h; = 5 W/m²-K and h, = 25 W/m²-K, respectively. The heat flux through the original walls is i The heat flux through the retrofitted walls is i W/m². W/m².
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