Problem 3:Refer to the rectangular region in the figure below, the inner boundary surfaces are insulated and heat genrated withinthe cast iron solid ġ" (kw/m'). Determine the temperature distribution within the salid where the boundary surfacesare kept at 20 C. where is the location of the maximum temperature? how much it will be if a =2b = 20 cm and c = 2d =10 cm and heat gencration is 1 kW/m??2b2dZInsulation20ġ" (kW/m)2a

Conduction heat transfer is the transfer of heat by virtue of direct contact or molecular…

Answered: Refer to the rectangular region in the…

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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Insulating material is used to reduce heat loss from the heating furnace walls to the room. The surface temperature of the insulating material is 100 ° C and the other surfaces 20 ° C. Allowable heat loss up to 140 W / m2 from the wall. If the thermal conductivity of the insulation material is 0.05 W / (m ° C), calculate the required thickness of insulation. insulation thickness = Answer cm
One-dimensional heat transfer through a composite wall is shown in the following figure. Please calculate the heat flow through the composite wall according to the equivalent thermal circuit. It is known that the thermal conductivity are ka=46.5 W/(m.K), kp=1.1 W/(m.K), kc =0.06 W/(m.K), respectively. The thickness of the three materials is Ax,=Axg=Axc=10mm. The temperature of wall 1 and wall 4 are t=80°C, t4=15°C, respectively. (Please give the compution process and the result.) A - Temperature profile RA Rg Rc T3 Axc A B 1 4 Figure for question 9
Consider a plate whose thickness is 2L=20 cm and thermal conductivity is 20 W/mK. Heat generation inside the plate (104 W/m³) is uniform. The plate is placed in an environment at T=20°C and convective heat transfer coefficient is h=16 W/m²K. Find the temperature at the center of plate. h To -L O a. 45 °C O b. 75 °C O c. 67 °C O d. 85 °C О е. 90 °С
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Please solve both parts with handwriting please need with correct answer need awesome answer solve both handwriting i requested to u. Part6. An exposed 8 cm external diameter, 20 m long hot-water pipe at 80°C is losing heat to the surrounding (outdoor) air by natural convection. The average outdoor temperature is 5°C. The heat transfer coefficient is 25 W/m2°C. What is the heat loss by natural convection, in kW? A. 9.4 W B. 10.0 W C. 10.4 W D. 11.4 W Part7. A spherical ball with a diameter of 10 cm has an outer surface that is maintained at a temperature of 200°C. It is suspended in the middle of a room that has an average temperature of 20°C. If the surface emissivity is 0.8, determine the rate of radiative heat transfer from the ball to the room in W. (Choose the nearest value) A. 2.3 W B. 4.5 W C. 19.4 W D. 60.8 W
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Consider 1D heat conduction in a Cu rod with an average temperature of 25C. Does there exist a maximum (or upper-limit value) temperature gradient for heat conduction. If so, what is that value with justification on the derivation/scientific reasoning. The thermal conductivity is k=385 W/m*K. The diameter of the rod is left in terms of d.
As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. "2. Ta2} 1. Ta,1} Steam Insulation (a) If the insulation is 10 mm thick and its inner and outer surfaces are maintained at T, = 800 K and Ta = 490 K. respectively,. what is the rate of heat loss per unit length (q) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (d), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the Inner surface temperature fixed at T = 800 K, inner radius = 0.06 m, and outer radius n = 0.18 m. The outer surface is exposed to an airflow (T 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tur = T, = 25°C. The surface emissivity of calcium silicate is approximately 0.8.
Q: Consider the section of wall as shown in the figure, assuming one dimensional heat flow, determine the following: I- Rate of heat transfer per unit area (1m³) through the composite wall. II- Determine also the temperature (Tp) as shown in the figure. To01 = 30 °C %3D Too2 = 2 °C hi = 20 w/m?.°C 8 cm h2 = 12 w/m2.°C 20 cm A F %3D kA = 0.6 W/m .°C D TD %3D 30 cm kB = 0.8 W/m .°C %3D Too1 T02 kC = 0.9 W/m .°C hi в | Е h2 10 cm kD = 0.7 W/m .°C kE = 0.5 W/m .°C kF = 0.04 W/m .°C 8 cm 6cm 12cm Good Luck
Q2: Write down the one-dimensional transient heat conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each term represents. Also, what is the units of every term?
a. The wall of a building has a surface area of 50 m2. The outside layer of the wall is 20 cm thick concrete with thermal conductivity kcon = .8 W/m-K. The inner layer is 10 cm thick balsa wood (kbalsa = .048 W/m-K) as an insulator. Outside temperatures of 47o C are expected, while an inside temperature of 21o C is maintained by the cooling system. Find the rate of heat transfer through the wall.
Ols क 1-3 A truncated cone 30 cm high is constructed of aluminum. The diameter at the top is 7.5 cm, and the diameter at the bottom is 12.5 cm. The lower surface is maintained at 93°C; the upper surface, at 540°C. The other surface is insulated. Assuming one- dimenșional heat flow, what is the rate of heat transfer in watts?

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