Solutions for Heat Exchangers Selection, Rating, and Thermal Design, Fourth Edition By Kakaç, Sadık

ALL 13 CHAPTERS COVERED
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SOLUTIONS MANUAL
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,TABLE OF CONTENTS
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1. Classification of Heat Exchangers
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2. Basic Design Methods of Heat Exchangers
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3. Forced Convection Correlations for the Single-
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Phase Side of Heat Exchangers
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4. Heat Exchanger Pressure Drop and Pumping Power
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5. Micro/Nano Heat Transfer M M




6. Fouling of Heat Exchangers
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7. Double-Pipe Heat ExchangersM M




8. Design Correlations for Condensers and Evaporators
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9. Shell-and-Tube Heat Exchangers M M




10. Compact Heat Exchangers
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11. Gasketed-Plate Heat Exchangers M M




12. Condensers and EvaporatorsM M




13. Polymer Heat Exchangers
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,ProblemM2.1

StartingMfromMEq.M(2.22),MshowMthatMforMaMparallelflowMheatMexchanger,MEq.M(2.26a)
becomes
T2  M 1 
2
MexpM   UA 
TM M  MC 1 
T


SOLUTION:



TheMheatMtransferredMacrossMtheMareaMd
AMis: (1)
QM=MUThM MTcMdA
TheM heatM transferM rateM canM alsoM beM writtenM asM theM changeM inM enthalpyM ofM eachM flui
dM (withM theMcorrectMsign)MbetweenMtheMareaMAMandMA+dA:
* forMtheMhotMfluidM(dTh<0)
QM=M-mM hcp,hdTh (2)
* forMtheMcoldMfluidM(dTc>0)
QM=MmMccp,cdTc (3)
TheMnotionMofMheatMcapacityMcanMbeMintroduce
dMas: (4)
CM=MmMcp
ThisMparameterMrepresentsMtheMrateMofMheatMtransferredMbyMaMfluidMwhenMitsMtemperatur
eMvariesM withMoneMdegree.
TheMequationM(2)MandM(3)Mgive:
QM=M- (5)
ChdThM MCcdTc
EquationsM(1)MandM(5)Mgive:
M dThM U
M
MM
M
(6)
dAMThM MTc
Ch
dTc UM
MM (7)
M ThM dAMC
c
MTc
SubtractingMequationM(7)MfromM(6):
Md(ThM MTcM)M
M 1 - (8)
 1 M M
M M Ud
A

ThMMTc MCcM M ChM
ConsideringMtheMoverallMheatMtransferMcoefficientMU=constant,MequationM(8)McanMbeMintegrated:
M 1 M
ln1TMMMMTM MM - (9)
M UAM+MlnB
h c  C C 
M M c hM

, M 1 1M  
ThM MTcM MBexpM -M MUA
 CM M
 CM
 c hM
M  (10)