An insulated heating pipe that is made from steel (k = 45 W/m K) with an inner radius of 150 mm and an outer radius of 155 mm. The pipe is coated with 100 mm thickness of insulation having a thermal conductivity of k = 0.06 W/m K. Air at Ti = 60 °C flows through the pipe and the convective heat transfer coefficient from the air to the inside of the pipe has a value of hi = 35 W/m2 K. The outside surface of the pipe is surrounded by air which is at 15°C and the convective heat transfer coefficient on this surface has a value of ho = X (W/m²K). (a) Calculate the heat loss through 50 m of this pipe. (b) Find the critical insulation radius, (c) Sketch the schematic of the system with complete labeling. Note: X = Last 2 digits of Student ID Number For example: if your ID Number is 202006719 then X = 19.

An insulated heating pipe that is made from steel (k = 45 W/m K) with an inner radius of 150 mm and an outer radius of 155 mm. The pipe is coated with 100 mm thickness of insulation having a thermal conductivity of k = 0.06 W/m K. Air at Ti = 60 °C flows through the pipe and the convective heat transfer coefficient from the air to the inside of the pipe has a value of hi = 35 W/m2 K. The outside surface of the pipe is surrounded by air which is at 15°C and the convective heat transfer coefficient on this surface has a value of ho = X (W/m²K). (a) Calculate the heat loss through 50 m of this pipe. (b) Find the critical insulation radius, (c) Sketch the schematic of the system with complete labeling. Note: X = Last 2 digits of Student ID Number For example: if your ID Number is 202006719 then X = 19.

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

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Question

Heat transfer

An insulated heating pipe that is made from steel (k = 45 W/m K) with an inner radius of 150 mm
and an outer radius of 155 mm. The pipe is coated with 100 mm thickness of insulation having a
thermal conductivity of k = 0.06 W/m K. Air at Ti = 60 °C flows through the pipe and the convective
heat transfer coefficient from the air to the inside of the pipe has a value of hi = 35 W/m2 K. The
outside surface of the pipe is surrounded by air which is at 15°C and the convective heat transfer
coefficient on this surface has a value of h. = X (W/m²K).
(a) Calculate the heat loss through 50 m of this pipe. (b) Find the critical insulation radius, (c)
Sketch the schematic of the system with complete labeling.
Note: X = Last 2 digits of Student ID Number
For example: if your ID Number is 202006719 then X = 19.

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