3.13 Consider a composite wall of overall height H = 20 mm and thickness L = 30 mm. Section A has thickness LA = 10 mm, and sections B and C each have height HB = 10 mm and thickness LB = 20 mm. The temperatures of the left and right faces of the composite wall are T1 = 50°C and T2 = 20°C, respectively. If the top and bottom of the wall are insulated, determine the heat rate per unit wall depth for each of the following three cases. Which case yields the largest heat rate per unit depth? Which yields the smallest heat rate per unit depth? Case kĄ(W/m • K) kB(W/m · K) kc(W/m · K) 1 2 3 3 1 3 3 1. A B H. T2

3.13 Consider a composite wall of overall height H = 20 mm and thickness L = 30 mm. Section A has thickness LA = 10 mm, and sections B and C each have height HB = 10 mm and thickness LB = 20 mm. The temperatures of the left and right faces of the composite wall are T1 = 50°C and T2 = 20°C, respectively. If the top and bottom of the wall are insulated, determine the heat rate per unit wall depth for each of the following three cases. Which case yields the largest heat rate per unit depth? Which yields the smallest heat rate per unit depth? Case kĄ(W/m • K) kB(W/m · K) kc(W/m · K) 1 2 3 3 1 3 3 1. A B H. T2

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

See similar textbooks

Related questions

Q: Determine the heat flux through the wall.

A: Given: The thermal resistance of the first layer is, R1=0.005°C/W. The thermal resistance of the…

Q: h = 30 W/m²K Taj = 20°C h. = 60 W/m²K Tzo =-15°C Fiberglass L=10 cm Plaster board Plywood L=2 cm…

Q: 2. A spherical container of negligible thickness holding a hot fluid at 150°C and having an outer…

A: Given Data D=0.5 m Ti=150°C To=30°C ti=40 mm

Q: Question 5: A copper bar 35 cm long, with square cross-section 2 cm x 2 cm is fitted with a…

Q: A composite plane wall of A and B is shown in the figure below. Wall A has uniform volumetric…

Q: A pot with a steel bottom 8.50 mm thick rests on a hot stove. The area of the bottom of the pot is…

Q: 1 example each Conductive heat flow through thick walled tube . CONDUCTED HEAT FLOW THROUGH THICK…

A: Solution:

Q: Heat is generated in a sphere of radius 1 m at a rate of 1000 W/m3. The sphere is surrounded by air…

A: The radius of sphere is The heat generation rate is The temperature of air is The thermal…

Q: An axisymmetric shape solid block with constant properties and no internal heat generation is used…

A: Given- 1. Constant Properties 2. No internal heat generation 3. Steady-State 4. One-dimensional…

Q: How long should an aluminum fin be in order to dissipate 90% of the heat that an infinitely long fin…

Q: A dormitory at a large university, built 50 years ago, has exterior walls constructed of L, =…

Q: 2. Heat conduction in a square plate Three sides of a y+ rectangular plate (a = 5 m, b = 4 m) are…

A: The given problem is a case of 2D heat transfer problem in a rectangular plate. As there is no heat…

Q: Two walls of a stol composed of insulating materia (k=0.25 KJ/hr-m-°C) with 15 cm thick and concrete…

A: Given For insulating material Thermal conductivity, k1 = 0.25 kJ/hr.m.K…

Q: An internal engine of a rocket (180°C furnace) generates heat flow of 23.2564 kW through a first…

A: ◆ This is the case of heat transfer through the cylindrical layer. ◆ The temperature profile for…

Q: 3. Consider a plane composite wall that is made of two materials of thermal conductivities ka = 205…

Q: A flat wall is exposed to an environmental temperature of 38oC. The wall is coveredwith a layer of…

A: Given: T1=41°CT2=315°CTe=38°Ck=1.4W/m°Cdx=2.5 cm = 0.025 m

Q: A dormitory at a large university, built 50 years ago, has exterior walls constructed of L, =…

A: Answer: (a) The heat flux through the original walls is 75.51 W/m2. (b) The heat flux through the…

Q: The walls of the flat furnace are connected by two insulating layers A and B. The temperature of the…

Q: wo heat reservoirs with respective temperatures of 325 and 275 K are brought into contact by an iron…

A: Given Thermal conductivity, k = 79.5 W/m K Temperature, T1 = 325 K…

Q: As shown in the figure, a 100 W/m² heat flux is applied to one side of the slab having thickness of…

A: q" = 100 W/m2L = 10 cm = 0.1 mk = 1 W/m.Kh = 10 W/K.m2To find temperature at L = 8 cm = 0.08 m

Q: A heat sink is supported by three posts made of A-36 steel and brass, as shown in the figure. The…

A: to find:force supported by each bargiven:the intensity of uniformly distributed load is length of…

Q: A very thin electrical strip providing heat flux of 909 W/m2 is attached to the plate as shown in…

Q: A composite bar is comprised of a concentric circular rod of copper and a tube of aluminum, each of…

A: Given data:

Q: 0 -K(T) = k (1+B7) Plane wall Example:-Consider a plane wall of thickness L whose thermal…

Q: 2. One side of a copper block 4 cm thick is maintained at 175-C. The other side is covered with a…

Q: thickness L= 20 mm with a thermal conductivity k=45 W/m·K has a uniform volumetric heat generation…

Q: Two plates, one of aluminum with a tickness of 14mm and one of brass with thickness of 9mm were…

A: Given: The thickness of aluminium plates, L1 = 14 mm = 0.014 The thickness of brass plates, L2 = 9…

Q: Consider a composite wall of overall height H = 30 mm and thickness L = 40 mm. Section A has…

Q: zero). Wall B has no heat generation and its outer surface (x = LA+LB) is exposed to a fluid at…

A: We have given that, uniform volumetric heating at a rate of q"=1898 kW/m3 = 1.898 X 106 W/m3 LA =…

Q: Find the temperature of a rod 0 < x < thermally insulated along the surface, if heat sources of…

Q: Refer to the rectangular region in the figure below, the inner boundary surfaces are insulated and…

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

Q: A copper slab (k=387 W/m-K) is 3 mm thick. It is protected from corrosion on each side by a…

A: copper slabK=387 w/mKthickness = 3mm = 0.003 mstainless steelk=14.4 w/mKthickness = 2mm =0.002…

Q: ### Given the resolution of the problem 5.102 below, develop a python program that shows the found…

A: import numpy as np import matplotlib.pyplot as plt # First, we define parameters L = 0.032 #…

Q: A composite plain wall is to be constructed of (1/4)-in. stainless steel (k=17.03 W/m-K), 3-in. of…

Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…

Q: as shown in the figure. Steady state temperature at the st tory is 1273 K and that at the outer…

Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

3.13 Consider a composite wall of overall height H = 20 mm and thickness L = 30 mm. Section A has thickness LA = 10 mm, and sections B and C each have height HB
= 20 mm. The temperatures of the left and right faces of the composite wall are T = 50°C and T, = 20°C, respectively. If the top and bottom of the wall are insulated, determine the heat rate per
unit wall depth for each of the following three cases. Which case yields the largest heat rate per unit depth? Which yields the smallest heat rate per unit depth?
= 10 mm and thickness LB
Case kA(W/m · K) k(W/m · K) kc(W/m· K)
1
3
3
3
3
1
A
В
HB
LB
H
T2
LA
C

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Trending now

This is a popular solution!

Step by step

Solved in 5 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Diagram of the problem, necessary formulas, clearance and numerical solution Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an iron rod 200 cm long and 24 cm2 in cross section. Calculate the heat flux between the reservoirs when the system reaches its steady state. The thermal conductivity of iron at 25 ◦C is 79.5 W/m K.
1) A wall section composed from the outside to inside, of concrete brick 100mm thick, an air space of 50mm, two layers of fiberglass insulation 38mm thick, concrete block 150mm thick and air space of 19mm and a gypsum board of 13mm. The exterior conditions are -20C and RH=90% while the interior conditions are 23C and RH=40%. The surface temperature from the outside to inside are shown in the figure. The permeances are: Still Air: µ = 175 ng/pa.s.m Fiber glass: M=2560 ng/pa.s.m? Concrete block: M= 200 ng/pa.s.m? Gypsum board: M= 2000 ng/pa.s.m? Concrete brick: µ = 4.55 ng/pa.s.m Determine if there is a risk of condensation, and if there is, what is the condensation rate? What would happen if a vapor barrier (M=0.2 ng/pa.s.m²) was installed on the warm side of the insulation (Surface 4). 21с 19C 16 С 12C -10 -15C -18C -19C Gyp Air Concrete Fiber Fiber Air Concrete Outdoor Indoor sum block Glass Glass brick 230 19 50 mm -20C 13 150 mm 38 mm | 38 mm 100 mm RH=90% RH=40% mm mm Surf. 1 Surf.…
Diagram of the problem, necessary formulas, clearance and numerical solution Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an iron rod 200 cm long and 24 cm2 in cross section. Calculate the heat flux between the reservoirs when the system reaches its steady state. The thermal conductivity of iron at 25 ◦C is 79.5 W/m K.
The fin shown in Figure is insulated on the perimeter. The left end has a constant temperature of 100 °C. A positive heat flux of q = 5000 W/m² acts on the right end. Let Ky = 10 W/(m °C) and cross-sectional area A = 0.1 m2 Determine the temperatures at L/4, L/2, 3L/4, and L, where L = 0.8 m. 4-0.1 m T-100 C 5000 W/m
A short bar of copper, 25 mm in diameter, is enclosed centrally within a steel tube of external diameter 36 mm and thickness 3 mm. At 0°C the ends of the bar and tube are rigidly fastened together and the complete assembly heated to 80°C. Calculate the stress in the bar and in the tube if E for copper is 100 000 N/mm?, E for steel is 200 000 N/mm? and the coefficients of linear expansion of copper and steel are 0.000 01/°C and 0.000 006/°C, respectively.
Two approaches used in development of the thermal resistance network in the x-direction for multi-dimensional problems are to assume any plane wall normal to the x-axis to be isothermal and to assume any plane parallel to the x-axis to be adiabatic. True or False True False
Thermal conductivity of G10 fiberglass is 0.3
A hot water pipe is used for domestic applications is insulated with a layer of calcium silicate. If the insulation is 25 mm thick and its inner and outer surfaces are maintained at Ts,1 = 800 K and Ts,2 = 400 K, respectively. The outside diameter is 0.12 m. Calculate the heat loss per unit length of the pipe. Given the thermal conductivity of calcium silicate insulation equals to 0.09 W/m.K.