Example 2 A cylindrical steam pipe having an inside surface temperature of 250 °C has an inside diameter of 8 cm and a wall thickness of 5,5 mm. It covered with a 9 cm layer of insulation having k= 0.5 W / m °C, followed by a 4 cm layer of insulation having k = 0.25 W/ m °C. Outside temperature of the insulation is 20°C Calculate the heat lost per meter of length. Assume K = 47 W/m°C. for the pipe

Example 2 A cylindrical steam pipe having an inside surface temperature of 250 °C has an inside diameter of 8 cm and a wall thickness of 5,5 mm. It covered with a 9 cm layer of insulation having k= 0.5 W / m °C, followed by a 4 cm layer of insulation having k = 0.25 W/ m °C. Outside temperature of the insulation is 20°C Calculate the heat lost per meter of length. Assume K = 47 W/m°C. for the pipe

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: E material has inner m'K, the temperatu

Q: A large concrete wall is 300 mm thick and has a thermal conductivity of 1.2 W/m C. The heat flux…

Q: Consider a thick spherical wall with insulation at both mk mk the inner and outer walls. The inner…

Q: A thick-walled tube of stainless steel with thermal conductivity k = 19 W/m°C has inner diameter of…

Q: What is the heat flow through the wall divided by wall area? W What is the heat flow (power) through…

Q: A wall is made up of an outer layer of brick, 79 mm (k = 0.65 W/m°C) followed by 41 mm layer of…

Q: Consider a plate whose thickness is 2L=16 cm and thermal conductivity is 50 W/mK. Heat generation…

A: Given : The thickness of the plate, 2L= 16 cm The thermal conductivity of plate = 50 W/mK The…

Q: Consider a cylindrical steel pipe of an inner radius of 2.9m, an outer radius of 3.2m, and thermal…

A: Given A cylindrical steel pipeinner radius (r1)=2.9 mouter radius (r2)=3.2 mThermal conductivity…

Q: A steel pipe (k = 48 W/m∙K) of a heating system carries wet steam at 125 °C. The inner and outer…

Q: A steam pipe, made of copper, has an inside diameter of 5 cm and an outside diameter of 6.2 cm. To…

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

Q: Question #1 Calculate the heat losses from an insulated steel pipe (k = 50 W/m K) with an internal…

A: Given:Thermal conductivity of steel pipe, kst=50 W/m.KInternal diameter of the pipe, d1=6 cm=0.06…

Q: ) The wall of a refrigerator is constructed of fiberglass insulation (k =0.035 W/m °C) sandwiched…

Q: The heat flux that is applied to the left face of a plane wall is q" = 50 W/m². The wall is of…

Q: A composite wall layer consists of layer A covered by layer B. The thermal resistance of layer A is…

Q: An oven made of stone with 3 m length and semi-cylindrical shape losses heat from inlet section of…

Q: Find the total conductive thermal resistance of a 2-m long two-layered cylindrical insulation jacket…

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: A spherical tank with internal diameter of 2 m made of 2.0-cm-thick stainless steel (k=15 W/m.K) is…

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

Q: Question 6 A steel pipe (k = 48 W/m-K) of a heating system carries wet steam at 120 °C. The inner…

A: Given: The conductivity of steel pipe is k1=48 W/m·K. The temperature of the steam is T1=120°C. The…

Q: Q1: A steel pipe (K = 45.0 W/m.K) having a 2.6 in O.D is covered with a 1.8 in thick layer of…

A: Data given- K1 = 45 W / mK d1 = 2.6 inch = 0.066 mm t1 = 1.8 inch = 0.0457 m K2 = 0.07 W/mK t2 =…

Q: A spherical container holding a hot fluid at 500 K and having an outer diameter of 0.5 m is…

Q: hermometric well is placed in a pipe having diameter of 55 mm. Pipe wall temperature is 100°C and…

A: For solution refer below images.

Q: A container has a 4 mm thick metal wall and is lined insider with a 1.5 mm-thick plastic. The inside…

A: Heat loss rate: The rate at which heat is transferred from the inside of the container to the…

Q: Heat loss through an insulation (k = 0.05 W/m·C) is 125 W/m2. The temperature gradient across the…

Q: Calculate the heat loss through a 3-in. thick insulation board that has an area of 2- ft² and a…

Q: Below is a diagram of a pipe with 5 m radius, temperature of 5000 K, and k = 450 W/m-K. The pipe is…

Q: A thick-walled tube of stainless steel with thermal conductivity k = 19 W/m°C has inner diameter of…

Q: B- A pipe 1.2 m in length having an inside surface temperature of 260 C has an inside diameter of 8…

Q: 1. Find the rate of heat leakage for a spherical tank 2 m inside diameter and 12 mm thick with…

Q: A 20 m metal pipe, with a thermal conductivity of 60 W/(m. K), is carrying pasteurised orange juice…

A: Given: Length of the pipe→L=20 m Thermal conductivity of metal pipe→k1=60 W/mK Temperature of orange…

Q: An oil flow through a 40 mm bore steel pipe with the thickness of 4 mm. The pipe is covered by 10 mm…

A: When heat flows from higher temperature T1 to lower temperatureT2 across the surface then, total…

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: A pipe of length L connects to thermal reservoirs that are kept constant at temperatures T₁ and T₂.…

A: GivenReservoirs temeprature T1 and T2length of the pipe =Lx=0.2L

Q: The oven of a stove must have a sufficient insulation so that the surface temperature of the stove…

A: For solution refer below images.

Q: In a thermal power plant, a horizontal copper pipe of "D" diameter, "L" length and thickness 1.2 cm…

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

Q: 1. A pipe is covered with three insulation layers 250mm and 300mm and the respective thermal…

Q: A 1,155 ft², 4 in. thick concrete wall has inside and outside surface temperatures of 24°C and 4°C.…

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

Example 2
A cylindrical steam pipe having an inside surface temperature of 250 °C
has an inside diameter of 8 cm and a wall thickness of 5,5 mm. It covered
with a 9 cm layer of insulation having k= 0.5 W / m °C, followed by a 4
cm layer of insulation having k = 0.25 W/ m °C. Outside temperature of
the insulation is 20°C Calculate the heat lost per meter of length. Assume
K = 47 W/m°C. for the pipe

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 5 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

The inner diameter of a pipe made of %1 C steel used in the drying machine of a textile factory is D1 = 160 mm and the thread diameter is D₂= 170 mm. The pipe is insulated with 25 mm thick glass wool. The heat transfer coefficient between the air and the pipe surface at 90 °C temperature inside the pipe is 80 W/m²K. The temperature of the ambient air outside the insulation is 20 °C and the air comes perpendicular to the cat wool surface at a speed of 10 m/s. Find the total heat transfer coefficient according to the inside diameter of the pipe. Calculate the heat transfer per unit length of pipe per unit time ?
Pressurized steam flows through a pipe of 0.6 m diameter. The pipe is embedded in a concrete block ,conductivity k = 1.4 W/mK ,with a square cross sectional length, w = 1 m. The required surface temperature values are 401 and 301 in K. Calculate the heat loss from the pipe per unit length. w Concrete T1 T2 D = 0.6 m
A dormitory at a large university, built 50 years ago, has exterior walls constructed of L, = 25-mm-thick sheathing with a thermal conductivity of ks = 0.1 W/m-K. To reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an L = 25-mm-thick layer of extruded insulation characterized by k; = 0.029 W/mK to the exterior of the original sheathing. The extruded insulation is, in turn, covered with an Lg = 5-mm-thick architectural glass with kg = 1.4 W/m-K. Determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are Too₁ = 22°C and T∞,0 = -20°C, respectively. The inner and outer convection heat transfer coefficients are h; = 5 W/m²-K and h, = 25 W/m²-K, respectively. The heat flux through the original walls is i The heat flux through the retrofitted walls is i W/m². W/m².
What is the temparature at depth 1 cm from the surface at t=2 minutes after the start of the coolıng ?
The front window of an automobile has a thickness of 4 mm and is defrosted by the passage of a stream of hot air through the inner surface. The thermal conductivity of glass is around 0.78 W/(m oC). Assume the ambient air temperature is -10°C and the external convection coefficient is 65W/(m2 K). If the hot air blowing to defog the glass internally is at 40 ºC and the internal convection coefficient corresponds to 30 W/(m2 K), the internal surface temperatures will be _____________. However, if the car accelerates and maintains high speed, the external convection coefficient should _____________ [increase or decrease?] and if the condition is maintained long enough the temperature of the inner surface of the glass should _____________ [increase or decrease?].
Answer this ASAP,thx An empty sphere is made of aluminum (k = 202 W/m. °C) with an inner diameter of 4 cm and an outer diameter of 8 cm. The inside temperature is 100°C and If the ball above is coated with an insulating material having k = 50 mW/m. °C 1 cm thick. The outside of this insulation is in contact with an environment having h = 20 W/m.°C and Ts = 10°C, calculate the heat transfer under these conditions.
Temperature distribution of a wall is given as T(x) = -100x + 50 and the cold surface is exposed to a convection environment at temperature of 20 °C. If the wall thickness is 10 cm and the conductivity is 1 W/mK what is the convection coefficient between the cold surface and the environment?
The exterior wall of a house is composed of a 20 cm thick layer of ordinary brick (conductivity 0.72 W/m K) and a 2.5 cm layer of plaster (conductivity 0.17 W/m K ) on each side (two layers in total). Other purely conductive resistances can be neglected, such as the layer of paint on both sides of the wall. Assume the outer face of the wall is at 35 °C and the inner face is at 20 °C and fill in the gaps. The magnitude of the heat flux through the wall corresponds to the _________ W/m2 and is perpendicular to the wall ________________(fill in with "outside-in" or "inside-out") of the environment. If the wall has a total area of 300m2, the heat transfer rate corresponds to ___________________
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.