exam 2 complete solution

exam 2 complete solution - rf,Ai* PL- ';tD'L= o'47t'tn*...

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Problem 3: 307o Water is to be heated from 15oC to 65oC as it flows through a 3-cm intemal diameter 5-m long tube. The tube is equipped with an electric resistance heater that provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so in a steady operation, all the heat generated in the heater is transferred to the water in the tube. (a) If the system is to provide hot water at arate of 10 L/min, determine the total required p of the resistance heater (w)' Ass uff1'2 sTo'^A-Y 'f0t.-; \lnd"frvvrn k\a-a- Tt * r::-,o= +0,. :) at:'".i|" lW^. K= o {3,j! . W'L\'+lfr: + - clrlj. ,?r, 2r = 0^668 x ro-a n%A Ac* f
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Unformatted text preview: rf,Ai* PL- ';tD'L= o'47t'tn* q.,l ' e *ts = nq2'l x lo* ^W^' {.tz-1 Wrnin' o'l ( 6q Ws Q" rn" cpCro-rt)= 3+.'6 kvJ .*) peucru h^Ji% % l^"-ft' $ip,.x; ry= toL. Iv$d^ (b) Draw the surface temperature and fluid mean temperature along the length of the tube {s T1 (c) Estimate the inner surface temperature of the pipe at exit. el,l" ot'.'= f CTs ^T.^) t -li.- T*^t + $ t . - ' , k J n'r* 9r ?+:I E -7?'+6tr ut4- d= -#l- l+'ls n^ ' : 0'2?6? Rn-. *f- ,]r'lttl"]:t 1: 10760 -.-\^'Lyf +&T o\s '-- *T o,65s x lo{ D<< L =? +^!J"9 I F . 6 . o ' 8 ^ 0 ' Y 6 1 ' 3 Nu,r* n D '- 5'oe 3 fu 'r'rL c DA*l +kz W 1 .r: + cbs. c 65-r '/-74rj t ltSoc ' 1S c. [v.n'l *t.- fqbz x - { )...
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This note was uploaded on 04/11/2008 for the course ME 3304 taught by Professor Stern during the Spring '08 term at Virginia Tech.

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exam 2 complete solution - rf,Ai* PL- ';tD'L= o'47t'tn*...

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