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Handbook for Heat Exchangers and Tube Banks design (Paperback, 2010 ed.)
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Handbook for Heat Exchangers and Tube Banks design (Paperback, 2010 ed.)
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The recently published book by the author, "Engineering Heat
Transfer", already dealt with exact computation of heat exchangers
and tube banks. In design c-
putationthisisaccomplishedviacorrectivefactors;thelattermakesitpossibleto
compute the actual mean temperature difference by starting from the
logarithmic onerelativeto?uidsinparallel?oworcounter?ow. As far as
veri?cation computation is concerned, corrective factors were int-
ducedtocomputeacertaincharacteristicfactorcorrectly,asisfundamentalforthis
typeofcomputation.
Basedontheabove,theauthordecidedtoinvestigatefurther,re?ne,andwiden
thistopic:theoutcomeofthisworkhasresultedinthishandbook.
Newtypesofexchangerswereexamined;thecalculationwasre?nedtoproduce
practicallyexactvaluesforthefactors.
Thescopeoftheinvestigationwasincreased by widening the range of the
starting factors. Furthermore, a greater number of
valuestobeincludedinthetableswasconsidered.
Finally,afewcharacteristicsof
certainvaluesofthecorrectivefactorswerehighlighted.
The?rstsectionisanintroduction;itsummarizesthefundamentalcriteriaofheat
transferandproceedstoillustratethebehaviorof?uidsinbothparallelandcounter
?ow. Italsoshowshowtocomputethemeanisobaricspeci?cheatforsome?
uids;
itillustratesthesigni?canceofdesigncomputationandveri?cationcomputation.
In
addition,itillustrateshowtoproceedwithheatexchangersandtubebankstocarry
outbothdesignandveri?cationcomputationcorrectly.
AppendixAthenincludes36tablesasareferencefordesigncomputation,The
tablescontainthecorrectivefactorsrequiredtoobtaintheactualmeantemperature
differencebystartingfromthemeanlogarithmictemperaturedifferencerelativeto
?uidsinparallel?oworcounter?ow. Finally, Appendix B includes 35
tables for veri?cation computation. As far as heatexchangers
areconcerned, itshowsthevaluesoffactor ? whichisrequired
forthistypeofcomputation.
Thevaluesofthecorrectivefactorsforcoilsandtube
banksarealsopresented. Milano,Italy DonatelloAnnaratone v Notation
c=speci?cheat(J/kgK) d=diameter(m) E=ef?ciencyfactor
h=enthalpy(kJ/kg) k=thermalconductivity(W/mK) M=mass?owrate(kg/s)
m=massmoisturepercentage(%) q=heatpertimeunit(W) 2 S=surface(m ) ?
t=temperature( C) 2 U=overallheattransfercoef?cient(W/m K)
x=thickness(m) 2 ? =heattransfercoef?cient(W/m K) ?
=characteristicfactor ? =characteristicfactor ? =ef?ciency ?
=correctivefactor ? =correctivefactor ? =characteristicfactor ? ?t
=temperaturedifference( C) vii viii Notation Superscripts
=heating?uid =heated?uid Subscripts c=counter?ow e=exchanger
i=inside l=logarithmic m=mean o=outside
p=constantpressure(isobaric),parallel?ow w=wall
1=inlet(forheatingorheated?uid) 2=outlet(forheatingorheated?uid)
Contents 1 Introduction to Computation ...1 1. 1
GeneralConsiderations ...1 1. 2 MeanIsobaricSpeci?cHeat ...3 1. 2.
1 WaterandSuperheatedSteam ...4 1. 2. 2 AirandOtherGases...4 2
Design Computation...7 2. 1 Introduction ...7 2. 2
FluidsinParallelFloworinCounterFlow ...8 2. 3
TheMeanDifferenceinTemperatureinReality ...12 2. 3. 1
FluidsinCrossFlow...14 2. 3. 2 HeatExchangers...15 2. 3. 3
Coils...19 2. 3. 4 TubeBankswithVariousPassagesoftheExternalFluid .
21 3 Veri?cation Computation ...25 3. 1 Introduction ...25 3. 2
FluidsinParallelFloworinCounterFlow ...25 3. 3
Factor?inRealCases...33 3. 3. 1 FluidswithCrossFlow ...
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