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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#m 3 E D C F3 $ 4 R F Ac = 1m² V Too,1=1 K h₁ = 1 W/m²K (5) Consider a wall (as shown above) of thickness L=1 m and thermal conductivity k-1 W/m-K. The left (x=0) and the right (x=1 m) surfaces of the wall are subject to convection with a convectional heat transfer coefficient h = 1 W/m²K and an ambient temperature T.= 1 K. Heat generation inside the wall is q=1W/m³. You may assume 1-D heat transfer, steady state condition, and neglect any thermal contact resistance. Find T(x). 44 % 5 Q Search F5 T G T₁ B x=0 * A 6 q=1 W/m³ k= 1W/mK L=1m F6 Y H F7 & 7 T₂ x= 1 m U N Top 2 = 1 K h₂=1 W/m²K PrtScn F8 8 Home M F9 ( 9 K End F10 0 L PgUp
Qi: (50 marks) Find the total heat flux of the composite wall when: B KA = KC = KF = 15 m. K KB = KD = 10 m. K KE = KG = 20 %3D m. K D. Height of B = C = D 4 cm 3 cm 4 cm 6 cm Height of F = G AT = 30 K
3- A large plane wall has a thickness L=50 cm and thermal conductivity k=25 W/m.K. On the left surface (x=0), it is subjected to a uniform heat flux go, while the surface temperature To is constant. On the right surface, it experiences convection and radiation heat transfer while the surface temperature is TL = 225°C and surrounding temperature is 25°C. The emissivity and the convection heat transfer coefficient on the right surface are 0.7 and 15 W/m²K, respectively. (a) Derive the temperature distribution equation for the wall parametrically (based on x, T₁, qo, L, and k). Plane wall Tsurr = 25°C T% = 25°C k = 25 W/m.K h = 15 W/m²K 90 ε = 0.7 T₁ = 225°C (b) Determine the temperature of the left surface of the wall at x=0? L x
A wall of a house is made from two layers of bricks enclosing a layer of insulation. A radiator is positioned to cover the whole internal surface, and used intermittently when the internal temperature is low. The external surface is exposed to the outside air. Which of the following assumptions could be used to identify the relevant reduced form of the conduction equation to find the temperature in the wall. a. Conduction is mainly in two directions. b. Conduction is mainly in one direction. c. The wall properties are homogeneous. d. Steady conditions exist. e. Unsteady conditions exist. f. There is an internal volumetric heat generation in the wall.
A box full of electronics to sense tremors with the dimensions shown in the diagram is buried deep in soil. The heat from the electronics keeps the box at a constant temperature of 398K. If the surrounding soil is at a temperature of 273K and has a thermal conductivity of 0.74 W/m/K, what is the heat transfer rate between the box and soil? 0.75m 0.75m 1.5m
A house, for cooling purposes, consists of two zones: the attic area zone A and the living area zone B (see below figure). The living area is cooled by a 2-ton air conditioning unit that removes 19 °F per thousand Btu. The time constant for heat 4 41,000 Btu/hr. The heat capacity of zone B is transfer between zone A and the outside is 2 hr, between zone B and the outside is 4 hr, and between the two zones is 4 hr. If the outside temperature stays at 90°F, how warm does it eventually get in the attic zone A? It eventually gets to be F in the attic zone A. (Type an integer or decimal rounded to the nearest hundredth as needed.) 4 hr Î A 쉽 4 hr B 2 hr 41,000 Btu/hr
1. Temperatures are measured at the left-hand face and at a point 4 cm from the left-hand face of the planar wall shown in the figure below. These temperatures are T₁ = 45.3 °C and T* = 21.2 °C. The heat flow through the planar wall is steady and one dimensional. What is the value of T2 at the right-hand surface of the wall? TI T* 4 cm 10 cm T2
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What is the heat loss through the windows of a passenger train left outside a station in winter, assuming that the temperature inside the train is 20°C, outside the train, -20°C, total heat transfer area 40 m2. The thickness of glass wall may be taken as 0.5 cm. The thermal conductivity of glass is 0.88 W/(m.K).
Steam passes through a steel pipe with an inner diameter of 60 mm and an outer diameter of 75 mm at 250 ° C. The heat transfer coefficients inside and outside the pipe are respectively 500 and 25 W / m2K. If the ambient temperature is 20°C and the heat transfer coefficient of the pipe is 56.5 W/mK A)Find the heat loss from the 5 m length of the pipe. B) What thickness of insulation should be made from the material with a heat transfer coefficient of 0.035 W / mK in order to reduce the heat loss by 95%.

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