A 15-mm radius pipe is going to be insulated with an insulation material (k=0.1 W/mK). The heat transfer coefficient between the pipe and the surrounding air is 10 W/m2K. What happens to heat transfer rate with respect to no-insulation (bare pipe) case if the thickness of the insulation material is I) 3 mm II) 4 mm III) 6 mm?a. I: decreases, II: does not change, III: increases b. I: decreases, II: decreases, III: decreases c. I: increases, II: does not change, III: decreases d. I: increases, II: increases, III: increases e. I: does not change, II: does not change, III: does not change (10p) A 15-mm radius pipe is going to be insulated with an insulation material (k=0.1 W/mK). The heat transfer coefficient between the pipe and thesurrounding air is 10 W/m?K. What happens to heat transfer rate with respect to no-insulation (bare pipe) case if the thickness of the insulationmaterial is I) 3 mm II) 4 mm III) 6 mm?a.I: decreases, Il: does not change, IlII: increasesO D. I: decreases, II: decreases. III: decreasesO C. I: increases, II: does not change, Il: decreasesOd.I: increases, I: increases, IlI: increasesO e.I: does not change, Il: does not change, IlII: does not change

First, calculate the critical radius rc=kh=0.110=0.01 m=10 mm

Answered: A 15-mm radius pipe is going to be…

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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A 15-mm radius pipe is going to be insulated with an insulation material (k=0.1 W/mK). The heat transfer coefficient between the pipe and the surrounding air is 10 W/m²K. What happens to heat transfer rate with respect to no-insulation (bare pipe) case if the thickness of the insulation material is I) 3 mm II) 4 mm III) 6 mm?

I: decreases, II: does not change, III: increases

I: decreases, II: decreases, III: decreases

I: increases, II: does not change, III: decreases

I: increases, II: increases, III: increases

I: does not change, II: does not change, III: does not change

(10p) A 15-mm radius pipe is going to be insulated with an insulation material (k=0.1 W/mK). The heat transfer coefficient between the pipe and the
surrounding air is 10 W/m?K. What happens to heat transfer rate with respect to no-insulation (bare pipe) case if the thickness of the insulation
material is I) 3 mm II) 4 mm III) 6 mm?
a.
I: decreases, Il: does not change, IlII: increases
O D. I: decreases, II: decreases. III: decreases
O C. I: increases, II: does not change, Il: decreases
Od.
I: increases, I: increases, IlI: increases
O e.
I: does not change, Il: does not change, IlII: does not change

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