For details shown below the rate of heattransfer per unit length is Q is:T=350 K, T=700 K, d= 10mm, N,=50,N =400-6Air properties: v= 61.1 10 m /s, k=0.0524 W/mxK, , Pr. = 0.707,Pr=0.695,Cp=1075J/Kg.K3•p=0.498 Kg/mS,20mmFlue gasV=5m/sToo=700K=T;p=1atmS=20mmLiSelect one:a. 701218 W/mb. 547649 W/mc. 206009 W/md. 401528 W/m

Solution: The rate of heat transfer per unit length of tube is, q'=h NπD ∆Tln=hNπD Ts-Ti-Ts-Toln…

For details shown below the rate of heat transfer per unit length is Q is: T=350 K, T=700 K, d= 10mm, N=50, N_=4 -6 2 Air properties: v= 61.1 10 `m /s, k =0.0524 W/mxK, , Pr. = 0.707,Pr=0.695, C,=1075J/Kg.K 00 3 .p=0.498 Kg/m

For details shown below the rate of heat transfer per unit length is Q is: T=350 K, T=700 K, d= 10mm, N=50, N_=4 -6 2 Air properties: v= 61.1 10 `m /s, k =0.0524 W/mxK, , Pr. = 0.707,Pr=0.695, C,=1075J/Kg.K 00 3 .p=0.498 Kg/m

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.42P

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Heat Exchanger

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Question

For details shown below the rate of heat
transfer per unit length is Q is:
T=350 K, T=700 K, d= 10mm, N,=50,
N =4
00
-6
Air properties: v= 61.1 10 m /s, k
=0.0524 W/mxK, , Pr. = 0.707,Pr=0.695,
Cp=1075J/Kg.K
3
•p=0.498 Kg/m
S,20mm
Flue gas
V=5m/s
Too=700K=T;
p=1atm
S=20mmLi
Select one:
a. 701218 W/m
b. 547649 W/m
c. 206009 W/m
d. 401528 W/m

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