Exercise 4.6.2 An insulation system around a cylindrical pipe consists of two different lay- ers. The first layer immediately on the outer surface of the pipe is made of glass wool and the second one is constructed using plaster of Paris. The cylinder diameter is 10 cm and each insulating layer is 1 cm thick. The thermal conductivity of the glass wool is 0.04 W/m°C and that of the plaster is 0.06 W/m °C. The cylinder carries hot oil at a temperature of 92 C, and the atmospheric temperature outside is 15°C. If the heat transfer coefficient from the outer surface of the insulation to the atmosphere is 15 W/m2 C, calculate the temperature

Exercise 4.6.2 An insulation system around a cylindrical pipe consists of two different lay- ers. The first layer immediately on the outer surface of the pipe is made of glass wool and the second one is constructed using plaster of Paris. The cylinder diameter is 10 cm and each insulating layer is 1 cm thick. The thermal conductivity of the glass wool is 0.04 W/m°C and that of the plaster is 0.06 W/m °C. The cylinder carries hot oil at a temperature of 92 C, and the atmospheric temperature outside is 15°C. If the heat transfer coefficient from the outer surface of the insulation to the atmosphere is 15 W/m2 C, calculate the temperature

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: The section of a vertical wall is made up of fiberglass insulation slabs separated by wooden studs.…

Q: mitigated by replacing a window containing a single pane of glass with (a) double-pane low-E…

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

Q: a flat wall is covered with a layer of insulation 1.0 in. thick whose thermal conductivity is 0.8…

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: An insulation layer of 20 mm thick refractory material is placed on top of a layer of mineral wool…

Q: On a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the…

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

Q: 20-m pipe has an outside diameter of 50 mm. Pipe is insulated with a layer of asbestos, then…

Q: Problem: A plane wall 6.0 cm thick generates heat internally at the rate of 0.3 MW/m³. One side of…

Q: A coolant is transported in a pipe with external wall temperature of -30 °C and with outer diameter…

A: Given:The temperature of an external wall of the pipe is the diameter of the pipe is the thermal…

Q: Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm…

Q: has an area of 5.5 ft² of 5 mm. If one side is at a temperature of 45° F and the other is at 23° F,…

Q: A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

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

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

Q: (2.4) Suppose the steam pipe of Problem 2.3 is a 4-in. schedule 40 steel pipe (ID= 4.026 in., OD=4.5…

A: Given : k=0.021 Btu ft/hft2°Fh∞=2 Btu /hft2°F

Q: You are designing a new eco-friendly thermal coffee mug. It is shaped like a small globe to minimize…

Q: It is necessary to insulate a flat surface so that the rate of heat loss per unit area of this…

A: Given, QA=450 W/m2 ∆T=400 K

Q: 3.48 A thin electrical heater is wrapped around the outer sur- face of a long cylindrical tube whose…

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

Q: The temperature at the inside surface of an oven is 460 oF. The inside wall of the oven is made of…

A: Given Temperature, T1 = 460oF T2 = 100oF Area, A = 2ft2…

Q: 5. A pipe with an outside diameter of 2.5 inches is insulated with 2 inches layer of asbestos (k =…

Q: Two industrial steel pipes are carrying 200 °C steam. The internal diameter of both pipes are 2.0 cm…

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

Q: Plaster Insulation Brick Inside Air Outside Air le ra A particular house wall consists of three…

A: CONDUCTION COVEVECTION HEAT TRANFER THROGH A COMPOSITE LAB Heat move through a plane mass of…

Q: 6. A steel pipe 1.5-m in length has an inside diameter of 7.6 cm with a wall thickness of 11.6 mm.…

A: calculating the total thermal resistance from the inside surface of the pipe to the outside of the…

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: The ceiling area of 100 square meters consists of four materials. The thermal insulation value of…

A: Area of the ceiling, A=100 m2Thermal insulation of first material from top, R1=1 m2.oC/WThermal…

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

Exercise 4.6.2 An insulation system around a cylindrical pipe consists of two different lay-
ers. The first layer immediately on the outer surface of the pipe is made of glass wool and the
second one is constructed using plaster of Paris. The cylinder diameter is 10 cm and each
insulating layer is 1 cm thick. The thermal conductivity of the glass wool is 0.04 W/m°C and
that of the plaster is 0.06 W/m °C. The cylinder carries hot oil at a temperature of 92°C,
and the atmospheric temperature outside is 15°C. If the heat transfer coefficient from the
outer surface of the insulation to the atmosphere is 15 W/m- C, calculate the temperature
at the interface between the two insulating materials and on the outer surface.

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

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 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

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 magnesia (K = 0.07W/m.K) which in turn covered with a 0.034 m layer of fiberglass insulation (K = 0.048 W/m.K). The pipe wall outside temperature is 200 °F and the outer surface temperature of the fiberglass is 97 °F. What is the interfacial temperature between the magnesia and fiberglass? Also calculate the steady state heat transfer.
9
A potato slice that is 1⁄4” inch thick is placed on a pan that is 212F. The slice has a thermal conductivity of 0.318 Btu/hr-ft-F, and an area of 4 sq in. What is the rate that it heats up if it is initially at 75F?
213
3. A cylindrical pipe of negligible thickness holding a hot fluid at 140°C and having an outer diameter of 0.4 m is insulated with three layers of each 70 mm thick insulation of K₁ = 0.02: k2 = 0.06 and k3= 0.16 W/m-K (starting from inside). The outside surface temperature is 30°C. Solve for the value of T2.
A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal conductivity and thickness of the insulation coating are 0.1 W/(m K) and 1 mm, respectively. The material of the plane wall is stainless steel 304. The density, thermal conductivity, and specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(mK), and 477 J/(kg K), respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the insulation coating surface is 70 W/(m²K). Insulation Coating Stainless Steel 304 Oven Gas Perfectly Insulated Wall 3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the stainless steel? The answer should be given in the unit of W/(m²K). 3-2) What is the value of the Biot number?
A pipe of length L connects to thermal reservoirs that are kept constant at temperatures T₁ and T₂. The pipe contains a gas with a thermal conductivity K, a density p, and a heat capacity cp. What is the temperature T of the gas in the tube at a distance x = 0.2L away from the thermal reservoir with temperature T₁ ? Select one: a. b. T = 0.5(T₁+T₂) T = T₁ +0.2 (T₂-T₁) c. T = T₁ +0.2(T₂-T₁) d. T = T₁ +0.2(T₁ - T₂)
Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to deliver steam with a pressure of 500 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 12 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible). a. Heat loss per hour. = Answer kJ / hour. b. Temperature between insulation layers. = Answer ° C.
Question 5 Heat transfer A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to maintain a set temperature of 6 °C. The bodies consist of two 10- mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane insulation (k=0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 11.6 W/m2K and 14.5 W/m2K respectively, calculate: WAO Data: Hgt = L2 = ho3= W = k2 = hi = L1 = L3 3= T01= m, k;= k3 = To2 = %3D %3D %3D %3D %3D %3D %3D Area= 5.1 the individual resistance(R) for each thermal layer, as well as for the total of the refrigerator,
Kindly help me to answer this thankyou
The interior of a refrigerator whose dimensions are 0.05 x 0.05 dam base area and 1.25 m high, must be kept at 4 °C. The refrigerator walls are constructed of two steel sheets (k= 35 kcal/h.m.°C) 3 mm thick, with 65 mm of material insulation (k=0.213 kcal/h.m.°C) between them. The film coefficient of the inner surface is 10 kcal/h.m².°C, while on the external surface it varies from 8 to 12.5 kcal/h.m².°C. Calculate: a) The power (in HP) of the refrigerator motor so that the heat flux removed from the inside the refrigerator maintain the specified temperature, in a kitchen whose temperature can vary from 21 to 36 °C; b) The temperatures of the inner and outer surfaces of the wall. Given 1 HP = 641.2 Kcal/h
1. A wall 2 cm thick is to be constructed from material that has an average thermal conductivity of 1.3 W/m C. The wall is to be insulated with material having an average thermal conductivity of 0.35 W/m C, so that the heat loss per square meter will not exceed 1830 W. Assuming that the inner and outer surface temperatures of the insulated wall are 1300 and 30 C, calculate the thickness of insulation required.