4. Consider steady, one-dimensional heat flow through two plane walls which are exposed to convection on both sides as seen in figure below. Sketch the temperature distribution from the out- side through the inside of plane wall. insulation k, = 0.07 Wim K Inside outside T-20°C T= 25°C h= 12 Wim? K h, = 8 Wim K 3 mm plastic K,= 1 Wim K 1 mm Stainless steel, k, - 16Wim K

4. Consider steady, one-dimensional heat flow through two plane walls which are exposed to convection on both sides as seen in figure below. Sketch the temperature distribution from the out- side through the inside of plane wall. insulation k, = 0.07 Wim K Inside outside T-20°C T= 25°C h= 12 Wim? K h, = 8 Wim K 3 mm plastic K,= 1 Wim K 1 mm Stainless steel, k, - 16Wim K

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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A pipe with 8 cm internal diameter, 9 cm outer diameter, 2 meter long, thermal conductivity 30W/mK is insulated by glass wool material with which thermal conductivity 0,05W/mK, thickness 4 cm. Internal surface temperature of the pipe T1 is 80°C, surrounding temperature where pipe is located is 20°C, convection heat transfer constant on outer surface of insulation is 25W/m?K. Kpo 30W/mk T.= 20°C h. = 25W/MK 4cm K= 0,05W/mK a. Detemine the heat loss from the pipe to surrounding (W)? b. What is temperature of the surface between glass wooden and pipe (T2)? c. What is critical insulation radius for pipe? Is insulation on the pipe succesful? Explain
Example: Steam in a heating system flows through tubes whose outer diameter isD1=3 cm and whose walls are maintained at: = 1.5 cm 2= 3 cm temperature of 120°C. Circular aluminun fins ( k=180 W/m °C) of outer diamete D2 6 cm and constant thickness t =2 mn T r32 mm are attached to the tube, as shown in Fig The space between the fins is 3 mm, an thus there are 200 fins per meter lengtl of the tube. Heat is transferred to th surrounding air at T= 25°C, with a combined heat transfer coefficient of h= 60 W/m2 °C. Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins. S 3 mm
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A cylindrical shape body of length is 1.9 m and diameter is 400 mm is inside a room where the ambient temperature is equal to 300 K. The initial temperature of the body is equal to 350 K. If the heat convective coefficient is equal to 1.3 W/m^2.K. What is the thermal conductivity K.
Qs A wall separated hot water from cold air in order to increase the heat transfer rate a number of fin s are added to air side. The heat transfer coefficient on the water side is 255 W/m K and on the air side is 57 W/m K, the thermal conductivity is 3 W/m.K. The surface area the wall 3 m × 0.6 m and the fin length is 125 cm with thickness of 0.5 cm if the number of fins are 96. determine the rate of heat transfer by adding the fins. Ans: 7484 W
A flat plate in an ambient at temperature Tꝏ received from a source the net radiant heat flux q” (fig. 3-52). The thickness of the plate d is much less than its length 2L; the third dimension of the plate extends to infinity. The heat transfer coefficient from the ends of the plate, if needed, may be taken to be h3 ≠h1 ≠h2. Find the temperature distribution in the system. Please type answer note write by hend.
10.The layout of a wall and the heat transfer parameters are shown in the figure below. Find the internal temperature of the wall, T₁. (o= 5.67 x 10-8 W/m²K4 ) (Ans: 569.5K) T1 k=1.1 W/m.K Icond L=0.12m T2=373K x=0.7 grad Iconv Tsur Air Tex = 300K h = = 290K : 18 W/m².K
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