A row of long cylindrical power cables that are spaced 2 cm evenly apart is placed in parallel with a plate (k = 15 W/m-K). The plate has a thickness of 5 cm, and its lower and upper surface temperatures are To=227°C and T₁ = 207°C, respectively. The power cables are shielded with polyethylene insulation, and the diameter of each cable is 1 cm. The opposite wall is at a temperature of T3 = 20°C. The upper surface of the plate experiences convection with air at 20°C and a convection heat transfer coefficient of 20 W/m2.K. According to the ASTM D1351-14 standard specification, the polyethylene insulation is suitable for operation at temperatures up to 75°C. Determine the surface temperature of the cable and check whether the polyethylene insulation for the power cables would comply with the ASTM D1351-14 standard specification. All surfaces can be approximated as blackbodies. D To- Air, h, Too Plate, k Wall -Power cable The surface temperature of the cables is 127 °C. Yes , the polyethylene insulation for the power cables will comply with the ASTM D1351-14 standard specification.

A row of long cylindrical power cables that are spaced 2 cm evenly apart is placed in parallel with a plate (k = 15 W/m-K). The plate has a thickness of 5 cm, and its lower and upper surface temperatures are To=227°C and T₁ = 207°C, respectively. The power cables are shielded with polyethylene insulation, and the diameter of each cable is 1 cm. The opposite wall is at a temperature of T3 = 20°C. The upper surface of the plate experiences convection with air at 20°C and a convection heat transfer coefficient of 20 W/m2.K. According to the ASTM D1351-14 standard specification, the polyethylene insulation is suitable for operation at temperatures up to 75°C. Determine the surface temperature of the cable and check whether the polyethylene insulation for the power cables would comply with the ASTM D1351-14 standard specification. All surfaces can be approximated as blackbodies. D To- Air, h, Too Plate, k Wall -Power cable The surface temperature of the cables is 127 °C. Yes , the polyethylene insulation for the power cables will comply with the ASTM D1351-14 standard specification.

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: A spherical container made of steel (ksteel = 15 W/m K) has a hot fluid inside at 100°C and is…

Q: A 2.5-cm-thick sheet of plastic initially at 20oC is placed between two heated steel plates that are…

A: Giventhe thermal diffusivity the thermal conductivity of the plasticthickness of the sheet…

Q: A long pipe carrying hot water loses heat to the ambient air. The heat loss was measured to be 480…

A: To find: The convection coefficient of the air. Given: The heat flux is q˙=480 W/m2. The temperature…

Q: Because you forgot to let the pipes drip during a freezing night, a section of an outdoor pipe is…

Q: A 15 mm diameter cylindrical nuclear fuel rod is housed in a hollow ceramic cylinder concentric to…

Q: A steel pipe having a 0.05m outer diameter is covered with a 0.042 m thick layer of magnesia (kes…

A: Givend=0.05mt1=0.042mkmg=0.07 W/m.Kt2=0.024mkf=0.048 W/mKT1=370KT3=305 K

Q: Steam at 230°C is flowing through a steel pipe (k = 15.1 W/m-K) whose inner and outer diameters are…

Q: A hot steam pipe having an inside surface temperature of 250°C has an inside diameter of 8 cm and a…

A: The thermal resistance of a hollow pipe can be calculated using the formula given below as-…

Q: A hot steam pipe having an inside surface temperature of 250°C has an inside diameter of 8 cm and a…

A: GIVEN DATA- A COMPOSITE CYLINDER GIVEN COVERED WITH DIFFERENT INSULATION WE HAVE TO FIND HEAT…

Q: The wall of a furnace consists of 200 mm thick refractory brick (k = 3 Btu / hr-ft2-0F), 100 mm…

Q: Answer shows Qtotal and Temperature at inner surface of window. 496W, 0.4°C Ob, 542W, 1.2°C O. 572W,…

A: Solution : Given data : Height (h)= 1.0 m Width (b)= 1.75 m…

Q: A 10-in-thick, 26-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k=…

Q: A thin electric heater is inserted between a long circular rod and a concentric tube with inner and…

A: Step - 1:Given that,outer radii are, rA=20mm and rB=40mm.kA=15W/m.KkB=0.8W/m.KFluid temperature…

Q: steel rod (k = 30 W/m degree) 1 cm in diameter and 7 cm long protrudes from a wall which is…

A: Given:K=30 W/mCd=1 cmL=7 cmTb=100°Ch=50 W/m2KT∞=30°C

Q: fer coefficient

A: Given Radius, r1 = 7.5 mm r2 = 17.5 mm r3 = 55 mm The Heat transfer…

Q: pizza oven has an interior temperature of 250◦C and the outside ambient kitchen temperature is 25◦C.…

Q: A 15 cm x 20 cm hot surface at 85°C is to be cooled by attaching 4 cm long aluminum (k = 237 W/m-°C)…

A: The dimension of the hot surface is = 15 x 20 cmThe temperature of hot surface = 85 oCLength of fins…

Q: A 2-meter long prism with square cross-section of side 0.1m is made of stainless steel with a…

A: The length of the prism is l=2m. The cross-section is a square of the side a=0.1 m. The thermal…

Q: Two large stainless steel plates at temperatures of 90°C and 70°C are separated by a stainless steel…

A: The diameter of the pipe is d=2.5 cm. The length of the pipe is L=0.3 m The thermal conductivity of…

Q: 400 circumferential fins of rectangular profile (k = 386 W/m °C) are installed on a tube having a…

Question

100%

A row of long cylindrical power cables that are spaced 2 cm evenly apart is placed in parallel with a plate (k = 15 W/m.K). The plate has
a thickness of 5 cm, and its lower and upper surface temperatures are To = 227°C and T₁ = 207°C, respectively. The power cables are
shielded with polyethylene insulation, and the diameter of each cable is 1 cm. The opposite wall is at a temperature of T3 = 20°C. The
upper surface of the plate experiences convection with air at 20°C and a convection heat transfer coefficient of 20 W/m².K. According
to the ASTM D1351-14 standard specification, the polyethylene insulation is suitable for operation at temperatures up to 75°C.
Determine the surface temperature of the cable and check whether the polyethylene insulation for the power cables would comply
with the ASTM D1351-14 standard specification. All surfaces can be approximated as blackbodies.
T3
Yes
T₂
To-
Air, h, Too
Plate, k
Wall
Power cable
The surface temperature of the cables is 127 °C.
>, the polyethylene insulation for the power cables will > comply with the ASTM D1351-14 standard specification.

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

Trending now

This is a popular solution!

Step by step

Solved in 4 steps with 1 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

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.
Consider the base plate of a 850W household iron with a thickness of L= 0.5 cm, base area of A = 150 cm?, and thermal conductivity of k= 25 W/m°C. The inner surface of the base plate is subjected to uniform heat flux generated by the resistance heaters inside. When steady operating conditions are reached, the outer surface temperature of the plate is measured to be 85°C. Disregarding any heat loss through the upper part of the iron, a. express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the plate, b. obtain a relation for the variation of temperature in the base plate by solving the differential equation, c. evaluate the inner surface temperature. d. Base plate - 85°C Fig. 1– Base Plate
A cast iron pipe (k = 80 W/m - oC) whose inner and outer diameters are 5 cm and 5.5 cm respectively is coverd with a 3 cm thick glass wool insulation (k = 0.05 W/m - oC) The temperature at the inner surface of the pipe is 320 oC and the interface temperature between the pipe and insulation is 300 oC. Determine the surface temperature of the insulation.
Consider the base plate of a 750-W household iron with a thickness of L=0.6 cm, base area of A=170 cm2, and thermal conductivity of k=22 W/m.oC. The inner surface of the base plate is subjected to uniform heat flux generated by the resistance heaters inside. When steady operating conditions are reached, the outer surface temperature of the plate is measured to be 85 oC. Disregarding any heat loss through the upper part of the iron, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the plate, (b) obtain a relation for the variation of temperature in the base plate by solving the differential equation, and (c) evaluate the inner surface temperature.
The wall of an oven in an industrial plant, made of fire brick (k = 0.71 W/m/K) has thickness of L = 15 cm. The oven is exposed to air at 28oC and the surfaces of the far surroundings are at 20oC. If the temperature of the outer surface of the wall is 92oC and the heat transfer coefficient and emissivity are 20 W/(m^2*K) and 0.8 respectively, determine the temperature of the inner surface of the wall.
A thin board of 0.5 cm thickness is exposed to a fluid of T, = 22°C and h = 30 W/m².K from one side with an emissivity of 0.7 where it faces a surrounding whose temperature is Tsur = 30°C. A heat flux of q" = 3500 W/m? is applied to the other side. Each side has an area of 12cm×12cm. Tsur (a) If the board has the following properties: k = 15.1 W/m.K, c, = 480 J/kg.K and p = 8055 kg/m², express an equation for the variation of temperature with respect to time. (b) Find the initial time rate of change of the board temperature if the initial board temperature is q" h 50°C.
A glass window with an area of 0.625 m² is installed in the wooden outside wall of a room. The wall dimensions are 25 x 3.05 m. The wood has a k of 0.151W/m.K and is 3.05 cm thick. The glass has a k of 0.692W/m.K and is 5.0 mm thick. The temperature of the inside room is 27°C and outside air temperature is 268K. (1)What is the heat loss through wooden wall and glass window q(W) ? (2) What are the total heat loss?
The 10-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper (k = 390 W/m-K). When used to boil water, the surface of the bottom exposed to the water is nominally at 110°C and heat is transferred from the stove to the pan at a rate of 1200 W. What is the temperature of the surface in contact with the stove for each of the two materials? Aluminum: T = i °C Copper: T = °C Physical Properties Mathematical Functions