The maximum heat transfer rate is for an infinite area counter flow heat exchanger.
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1 IAM Heat Exangers 9. Aendix Illustratin f se nets in eat exangers 9.. Heat Exanger Effetiveness is is defined as: Atual Heat ransfer ate Maxiu Pssible Heat ransfer ate q q ax e axiu eat transfer rate is fr an infinite area unter flw eat exanger. q ax ( q ( i i ax i i i.e. in general: q & ( i ax ( in In a real eat exanger q ( ( i i i ( i ( & ( in i i ( & ( in i ( i i S: ( i & i if ( in and if ( & in ( i i ( i i ( 9.. ransfer Unit nsider a unter flw eat exanger: dq d d ake & < d d > nstant (s PDF reated wit FinePrint dffatr trial versin tt: 7
2 IAM Heat Exangers e erating line is a lt f te rresnding values f against in te exanger (wit sle s > fr & <. is is ared wit te equilibriu line wi is drawn su tat (sle. Sle f erating line: s & i i In tis situatin s ( & ( & in ax Fr tis ase: ( & i < and i i UA NU is a nn-diensinal exressin f te eat exanger size. ( in e greater te nuber f transfer units, te lser te erating line araes t te equilibriu line. 9.. arisn between LMD fatr and NU-effetiveness araes are tw exangers: [] Perfet unter flw (as referene [] eal exanger Ea as te sae q, U,,,,,, but teir areas are different. i i Aunterflw en F t and A atual (NU unterflw F t fr te sae value f (NU atual Als te araeter S fr ( in S fr ( in araeter ( & in ( & ax eiter r ( & ( & ax in i.e. a ne-t-ne rresndene exists between te tw sets f araeters. PDF reated wit FinePrint dffatr trial versin tt: 8
3 IAM Heat Exangers 9.4. eerature rss in a sell and tube eat exanger nsider a ne sell-ass, tw tube-ass eat exanger: A teerature rss is iinent wen: ( i but ( & ( in i i r ( & ( in i ( i i In te abve ase & < i i..(9.4. i i i + i i i + i i But if tere is a teerature rss: & and if ( in & ten ( & ( & in ax i i Substituting fr in Equatin 9.4.: + is an be drawn n te arriate NU lt t illustrate te urrene f te teerature rss. PDF reated wit FinePrint dffatr trial versin tt: 9
4 IAM Heat Exangers eerature distributin in a (, sell and tube eat exanger e detailed teerature distributin deends n te relative ats taken b te sell and tube fluids Graial reresentatin f Heat Exangers in Series ake & & in ( s sle > Overall effetiveness: Fr te diagra, Siilarl: us i i i i ( 4 4 i i i 4 4 PDF reated wit FinePrint dffatr trial versin tt:
5 IAM Heat Exangers In general, fr n asses: Inverting: n i i i n i i i (9.6. Slving fr, i n n i i i i i If all te units are idential ( n {( ( } n {( ( } r inverting: n {( ( } n {( ( } i and we ut (aait ati...(9.6. Seial ase f Fr te abve exressin, fr te seial ase f, is undefined. e diagra n te left a be used t investigate te situatin. In tis ase te erating line as a sle f unit. We nsider n idential exangers in series. e stri AXZ' reresents te first f tese. Fr te first exanger : XY XZ but ZZ but XY AX n is silifies t : n As befre: { n } { n} n + ( n ( n n DE DF n sine tere are"n"stris and XY (ZZ PDF reated wit FinePrint dffatr trial versin tt:
6 IAM Heat Exangers Heat exangers in Series-Parallel nfiguratin In general fr n asses: n i i i Fr te seial ase were 0, ten n { i} and { i} i n i us, fr 0, te teerature f te sendar fluid reains nstant and s te situatin alies t an te f exanger and an te f nnetin fr te sendar fluid (series, arallel r binatins f te tw. 0. eferene Bks. JANNA, Willia S, Engineering Heat ransfer, Van-Nstrand einld Internatinal. HOLMAN, J P, Heat ransfer, MGraw-Hill. KEIH, F, ransissin de la aleur (ranslatin f Priniles f Heat ransfer, Massn et ie. 4. KAYS, W M and LONDON, A L, at Heat Exangers, MGraw-Hill 5. SAADUA, J F, Initiatin aux ransferts eriques, enique et Duentatin. 6. SHAMSUNDA, N, A rert f te lg-ean teerature-differene rretin fatr, Meanial Engineering News, 9(, 4-5, LIENHAD, J (iv and LIENHAD, J (v, A Heat ransfer extbk, rd editin (August 00. Available fr dwnlad n te Internet at: tt:web.it.edulienardwwwatt.tl PDF reated wit FinePrint dffatr trial versin tt:
7 IAM Heat Exangers. ables f eretial elatinsis fr Heat Exangers.. Heat exanger effetiveness relatins N NU ( in ( in ( ax UA & effetiveness Flw geetr elatin Duble ie: Parallel-flw { ex[ N( + ]} ( + unter-flw ex[ N( ] ex[ N( ] rss flw: unter-flw ( N ( N + Bt fluids unixed ex( Nn ex were n n N 0. Bt fluids ixed + ex( N ex( N N ( ax ixed, ( in unixed ( { ex[ ( ex( N ]} ( ax unixed, ( in Sell and tube: ixed ex{ ( [ ex( N ]} One sell ass,, 4, 6 tube asses + + ( + + ex ex { N( + } { ( N + } All exangers wit 0: ex( N PDF reated wit FinePrint dffatr trial versin tt:
8 IAM Heat Exangers.. NU relatins fr eat exangers ( in ( ax effetiveness N NU UA ( in Flw geetr Duble ie: elatin Parallel-flw lg { ( + } N e ( + unter-flw ( - N lge unter-flw ( N (- rss flw: ( ax ixed, ( in unixed N lg [ + ( lg ( ] e e ( ax unixed, ( in Sell and tube: ixed N ( lg [ + lg ( ] e e One sell ass,, 4, 6 tube asses N ( + lg e ( ( ( + + ( + All exangers wit 0: N lg ( e PDF reated wit FinePrint dffatr trial versin tt: 4
9 IAM Heat Exangers. arts.. Sell and ube Heat Exanger.. rretin Fatr Plt fr (, Sell and ube Heat Exanger PDF reated wit FinePrint dffatr trial versin tt: 5
10 IAM Heat Exangers.. en Brek lt fr utlet teerature f a (, Sell and ube Heat Exanger.4. &.5. Effetiveness-NU lts fr (a Duble ie; (b (, Sell and ube Exangers PDF reated wit FinePrint dffatr trial versin tt: 6
11 IAM Heat Exangers.6. rretin Fatr Plt fr rssflw Heat Exanger wit Bt Fluids Unixed.7. Effetiveness-NU Plt fr rssflw Heat Exanger wit Bt Fluids Unixed PDF reated wit FinePrint dffatr trial versin tt: 7
12 IAM Heat Exangers.8. rretin Fatr Plt fr rssflw Heat Exanger wit One Fluid Mixed.9. Effetiveness-NU Plt fr rssflw Heat Exanger wit One Fluid Mixed PDF reated wit FinePrint dffatr trial versin tt: 8
13 IAM Heat Exangers.0. rretin Fatr Plt fr rssflw Heat Exanger wit Bt Fluids Mixed.. Effetiveness-NU Plt fr rssflw Heat Exanger wit Bt Fluids Mixed PDF reated wit FinePrint dffatr trial versin tt: 9
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