A 3-layered composite wall is consists of different materials. Inside is wall 1: 300 mmthick, k = 1.5 W/m-K, then wall 2: 200 mm thick, k = 3.5 W/m-K, and wall 3: 100 mmthick. The inside surface is exposed to gases at 2192°F with surface film coefficient of5.3 BTU/hr-ft2-R. The temperature of air in the other side of the wall is 30°C with filmcoefficient of 10 W/m²-K. If the minimum temperature of wall 3 is 356°F, find theoverall heat transfer coefficient (W/m²-K) and the temperature drop (°C) at wall 2.

Given: K1=1.5w/m-k L1=300mm=0.3m K2=3.5w/mk L2=0.2m K3= thermal conductivity of third wall L3=0.1m…

A 3-layered composite wall is consists of different materials. Inside is wall 1: 300 mm thick, k = 1.5 W/m-K, then wall 2: 200 mm thick, k = 3.5 W/m-K, and wall 3: 100 mm thick. The inside surface is exposed to gases at 2192°F with surface film coefficient of 5.3 BTU/hr-ft²-R. The temperature of air in the other side of the wall is 30°C with film coefficient of 10 W/m²-K. If the minimum temperature of wall 3 is 356°F, find the overall heat transfer coefficient (W/m²-K) and the temperature drop (°C) at wall 2.

A 3-layered composite wall is consists of different materials. Inside is wall 1: 300 mm thick, k = 1.5 W/m-K, then wall 2: 200 mm thick, k = 3.5 W/m-K, and wall 3: 100 mm thick. The inside surface is exposed to gases at 2192°F with surface film coefficient of 5.3 BTU/hr-ft²-R. The temperature of air in the other side of the wall is 30°C with film coefficient of 10 W/m²-K. If the minimum temperature of wall 3 is 356°F, find the overall heat transfer coefficient (W/m²-K) and the temperature drop (°C) at wall 2.

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: Q: In iron whose base plaet is mad aluminum alloy is turn on : The time for the plate temperature to…

Q: A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200 °C.…

A: Given:The length of the brass rod is the diameter of the rod is the temperature of the casting is…

Q: a) The temperatures between the air layer ?1 and ?2 indicated in the figure. b) The flow of heat…

A: Fourier Law of heat transfer:- Fourier law of heat transfer states that amount of heat transfer is…

Q: A glass window inside storefront has an are of 12m2 and a thickness of 1 cm. The thermal…

Q: To confirm that a double-pane window is indeed better than a single-pane window, you ran some tests.…

Q: A homeowner wants to reduce their monthly heating bill and carbon footprint and is considering…

Q: Required information The upper surface of a 85-cm-thick solid plate (k= 237 W/m-K) is being cooled…

Q: Hot square plate (1 m ×1 m) is to be cooled by attaching aluminum circular pin fins (D=0.25 cm, L= 3…

A: Given:- Plate=(1×1)m2D=0.25 cmL=3 cmd=0.6 cmTb=100°CT∞=30°Ch=35 W/m. °C. To find:-Total rate of heat…

Q: A thin square plate is heated to a temperature of 80°C and then quickly submerged in a water bath at…

Q: 5 A double glazed window of 1.5 m² surface consists of two layers of glass (k = 0.78 W m-¹ K-¹) each…

Q: 8-Consider a 0.8 m high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of…

A: Given data as per question Double pan window, 0.8 m high and 1.5 m wide Thickness of glass layer,…

Q: A house in Scotland has a back (kitchen) door that is 1 m wide and 2 m high. The lower half of the…

A: (1) To find: The rate of heat loss. Given: The width of the door is w=1 m. The height of the door is…

Q: A food product with 73% moisture content in a 10 cm diameter can wants to be frozen. The density of…

Q: A flat wall 0.1 m thick and k = 25 W/(m-°C) has a heat generation rate per unit ofvolume of 0.3…

A: The problem involves a flat wall with heat generation and heat transfer to a fluid. The wall is…

Q: [2] Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of…

Q: Calculate the thermal conductivity (in W/m-K) of a material having a heat loss of 1028 watts, inside…

A: Given: The heat loss is Q=1028 W. The inside diameter is d1=59.4 cm. The thickness is t=118.4 mm.…

Q: The top of a large industrial hot water heater has been left uninsulated. The top may be modeled as…

A: To calculate the heat transfer rate from the top of the hot water heater, we need to consider both…

Q: (b) A hydrogen gas cylinder is situated in the cylinder cage. The cylinder wall is constructed from…

Q: Required information The upper surface of a 85-cm-thick solid plate (k = 237 W/m-K) is being cooled…

A: Solution:- Given data :- k =237 W/ m.k kfluid = 0.631 W/m.k

Q: The 3-layer wall consists of glass-air-glass and the thickness is 2 cm, 5 cm, and 2 cm,…

Q: A refrigerated room is maintained at -10 The room IS sides are covered with 150mm thick rigid…

A: GivenDimensions of room=15m×5m×2mt=150mm=0.15mh=15W/m2Kk=0.020W/mkTI=-10°CTS=25°C

Q: An 8-m long square duct with thin metal walls is hanging in a room where the temperature is 10 °C.…

A: Length of the duct, L=8 mRoom temperature, T∞=10oCAir inlet temperature, Ti=75oCoSpecific heat of…

Q: A 3.5 cm pipe carrying a condensing steam at 101 kPa passes through the center of an infinite plate…

A: Here I am going to find the shape factor of pipe which is centrally inside a plate

Q: Heat Transfer Course Copper balls with an initial temperature of 200 degrees centigrade (ρ = 8933…

Q: Consider a long horizontal pipe with a diameter of 90 mm and emissivity of 0.8 transfers steam at…

A: Given data Taking the properties of air at mean temperature from data book

Q: Electronic components are attached under a thin square plate and the all the energy dissipated by…

Q: What is the rate of heat loss through a 4-cm Fiberglass wall of the inside temperature is 22 °C and…

Q: In a concentrated solar power plant, molten salt tank is used to store the thermal energy from the…

Q: SITUATIONAL PROBLEM I: A composite wall constructed of 2.5 cm of steel (k= 60.5 W/m-K) and 5.0cm of…

Q: Two rods ( fins) having same dimensions , one made of brass ( k = 85 Wm K) and the other of copper (…

A: Given data: - The thermal conductivity of brass rod is kB = 85 W/m-K. The thermal conductivity of…

Q: A 5.0 -cm-diameter aluminum cylinder is maintained at a temperature of 50-C in a large room where…

A: total heat transfer = heat transfer by convection + heat transfer from radiation

Q: A food product with 73% moisture content in a 7 cm diameter can wants to be frozen. The density of…

A: Moisture content = 73% = 0.73 Density = 970 kg / m³ Diameter = 7 cm = 0.07 m Thermal conductivity =…

Q: Q3) Consider a 1.2 m high shown in Figure, consisting of two 3 mm thick of glass (k 0.78 W/m."C)…

A: The heat transferred through the wall can be calculated using the formula given below as- Q=kA∆Tl…

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

A 3-layered composite wall is consists of different materials. Inside is wall 1: 300 mm
thick, k = 1.5 W/m-K, then wall 2: 200 mm thick, k = 3.5 W/m-K, and wall 3: 100 mm
thick. The inside surface is exposed to gases at 2192°F with surface film coefficient of
5.3 BTU/hr-ft2-R. The temperature of air in the other side of the wall is 30°C with film
coefficient of 10 W/m²-K. If the minimum temperature of wall 3 is 356°F, find the
overall heat transfer coefficient (W/m²-K) and the temperature drop (°C) at wall 2.

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Step by step

Solved in 5 steps with 2 images

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

Troom = 25°C Problem-4: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/m-K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The walls of the room are also at 25°C. The outer surface of the tank is black (emissivity = 1), and heat transfer between the outer surface of the tank and the surroundings is by natural convection and radiation. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m²-K and 10 W/m².K, respectively. Determine (a) the rate of heat transfer to the iced water in the tank and (b) the amount of ice at 0°C that melts during a 24-h period. The heat of the fusion of water at atmospheric pressure is hf5 333.7 kJ/kg. Iced water D D₁= 8 m Tin = 0°C 1.5 cm
A food product with 73% moisture content in a 7 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -2 ° C. After 11 hours in the freezing medium -30 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = W / (m² K).
The temperature of a tank in the form of liquid nitrogen is -10 ° C. Tank diameter is 16 cm. The amount of heat lost by convection and radiation from the tank to the environment is 65.5 W / m. Calculate the temperature of the environment where the tank is located .h = 4.35 W / m2K, e= 1.
The length of one side of a cube-shaped freezer cabinet is 11.8 m. your closetits base is perfectly insulated against heat transfer and the inner surface temperature is –5 °C, the outer surface temperatureand it is 59°C. To ensure that the thermal load of the cabinet is not less than 0.59 kWThe thickness of the styrofoam foam insulation (k=0.03 W/mK) to be applied to the upper and side surfacesWhat should be less?
A furnace wall is made up of three layer of thickness 150 mm, 110 mm, and 125mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. Theinside is exposed to gases at 1050°C with a convection coefficient of 25 W/m2-Kand the inside surface temperature is at 900°C, the outside air temperature is at30°C with convection coefficient of 12 W/m2 -K. Calculate:a. the unknown thermal conductivity;b. the outside surface temperature and mid-plane temperatures in °F.
A mercury-in-glass thermometer having a diameter of 6 mm is placed in a verti- cal position to measure the air temperature in a metal warehouse in the summer. The walls of the warehouse are at 50°C. The convection coefficient is 7 W/m² - °C, and the emissivity of the thermometer may be taken as € = 0.9. Calculate the temperature indicated by the thermometer if the air temperature is 32°C.
Thermal jackets are typically put on cryogenicstorage tanks to minimize the heat transfer gainsfrom the surroundings. Consider a cylindercontainer that is 1.5 m long made from steel (k = 750W/m.K) with an inner diameter of 0.5 m and outerdiameter of 0.7 m. If the liquefied natural gas (LNG)inside the cylinder is maintained at 90 K, ambientconditions are Tamb = 20 °C, h = 7 W/m2.K. What isthe required thermal jacket thickness to maintainthe outer temperature of that jacket of 15 °C? (Takea thermal conductivity of the insulation to be kins =0.015 W/m.K). Image credit: Okorder. Image forillustrative purposes only.
Thermal jackets are typically put on cryogenicstorage tanks to minimize the heat transfer gainsfrom the surroundings. Consider a cylindercontainer that is 1.5 m long made from steel (k = 750W/m.K) with an inner diameter of 0.5 m and outerdiameter of 0.7 m. If the liquefied natural gas (LNG)inside the cylinder is maintained at 90 K, ambientconditions are Tamb = 20 °C, h = 7 W/m2.K. What is the required insulationmaterial to maintain the outer temperature of that jacket of 15 °C? Usethe end of the book and write your assumption with the right value.(Take a maximum allowed jacket thickness of Lins = 7 cm)
In the arctic sea, the ice sheets are melting. Let's calculate the temperautre distribution in one such ice sheet. The sheet is 2 m thick. Under the sheet there is ice-water mixture and it can be assumed that the temperature of the bottom surface of the ice sheet is approximately 0°C. Air at -20°C is blowing above the sheet. The convection coefficient of air is 15 W/m².K. The thermal conductivity of ice is 2.2 W/m.K. What is the temperautre of icesheet at its center (i.e., at 1 m from the surface)?
A large spherical storage tank, 2 m in diameter, is buried in the earth at a location where the thermal conductivity is 1.5 W/m.°C. The tank is used for the storage of an ice mixture at 0°C, and the ambient temperature of the earth is 20°C. Calculate the heat loss from the tank.
A block with thickness 2.3cm, and conductivity k-4W/mK is heated such that its temperature at its top is T₁-191°C Above the block, air at temperature Tair 22°C is blowing across the top which has a surface area of 1m² with heat transfer coefficient of 26W/m²K. air & W/mK T₁ T₂ What is the thermal resistance from T₂ to T? Provide total thermal resistance answer in units of K/W and to 4-decimal places