IJRET: Internatinal Jurnal f Research in Engineering and Technlgy ISSN: 319-1163 THERMAL ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER USING MAT LAB AND FLOEFD SOFTWARE A.GpiChand 1, A. V. N. L. Sharma, G. Vijay Kumar 3, A.Srividya 4 1 AsscPrf, HOD, 3,4 STUDENT, MECHANICAL ENGINEERING, SWARNANDHRA COLLEGE OF ENGINEERING AND TECHNOLOGY ANDHRA PRADESH, INDIA, allakagpichand@gmail.cm, avnls775 @gmail.cm vijayramuk311@gmail.cm, srividya330@gmail.cm Abstract In this paper, a simplified mdel fr the study f thermal analysis [1] f shell-and-tubes heat exchangers f water and il type is prpsed..shell and Tube heat exchangers are having special imprtance in bilers, il clers, cndensers, pre-heaters. They are als widely used in prcess applicatins as well as the refrigeratin and air cnditining industry. The rbustness and medium weighted shape f Shell and Tube heat exchangers make them well suited fr high pressure peratins. In this paper we have shwn hw t dne the thermal analysis by using theretical frmulae fr this we have chsen a practical prblem f cunter flw shell and tube heat exchanger f water and il type, by using the data that cme frm theretical frmulae we have design[] a mdel f shell and tube heat exchanger using Pr-e and dne the thermal analysis by using Flefd sftware and cmparing the result that btained frm Flefd sftware and theretical frmulae. Fr simplificatin f theretical calculatins we have als dne a Matlab cde which is useful fr calculating the thermal analysis f a cunter flw f water-il type shell and tube heat exchanger. Index Terms: Cunter flw f shell and tube heat exchanger f il and water type, Flefd sftware, Matlab sftware. --------------------------------------------------------------------- *** ------------------------------------------------------------------------ 1. HEAT EXCHANGER A device whse primary purpse is the transfer f energy between tw fluids is named a heat exchanger[4]. Aheat exchanger may be defined as an equipment which transfers the energy frm a ht fluid t a cld fluid, with maximum rate and minimum investment and running csts[5]. 1.1 Shell and Tube Heat exchanger In this type f heat exchanger ne f the fluids flw thrugh a bundle f tubes enclsed by a shell. the uter fluid is frced thrugh a shell and it flws ver the utside surface f the tubes. such an arrangement is emplyed where reliability and heat transfer effectiveness[4]. It is the mst cmmn type f heat exchanger in il refineries and ther large chemical prcesses, and is suited fr higher-pressure applicatins. This type f heat exchanger cnsists f a shell (a large pressure vessel with a bundle f tubes inside it. One fluid runs thrugh the tubes, and anther fluid flws ver the tubes (thrugh the shell t transfer heat between the tw fluids. FLOEFD FlEFD can be used t study the fluid flw and heat transfer fr a wide variety f engineering equipment. In this example we use FlEFD t determine the efficiency f a cunter flw heat exchanger and t bserve the temperature and flw patterns inside f it. With FlEFD the determinatin f heat exchanger efficiency is straightfrward and by investigating the flw and temperature patterns, the design engineer can gain insight int the physical prcesses invlved thus giving guidance fr imprvements t the design. A cnvenient measure f heat exchanger perfrmance is its efficiency in transferring a given amunt f heat frm ne fluid at higher temperature t anther fluid at lwer temperature. The efficiency can be determined if the temperatures at all flw penings are knwn. In FlEFD the temperatures at the fluid inlets are specified and the temperatures at the utlets can be easily determined. 3. DESIGN CALCULATIONS [1] 3.1 THEORITICAL DESIGN CALCULATIONS: Fig-1:Shell and Tube Heat exchanger f type Water t il. mc Mass flw rate f cld fluid Vlume: 01 Issue: 03 Nv-01, Available @ http://www.ijret.rg 76
IJRET: Internatinal Jurnal f Research in Engineering and Technlgy ISSN: 319-1163 kg mc 0.9 sec mh Mass flw rate f ht fluid kg mh.5 sec cpc Specific heat f cld fluid cp c kj 4. kg k cph Specific heat f ht fluid cp h kj.5 kg k Q m c T m c T T c c c lm h h lm 0.9 4. ( 308.5.5 (383 360 346.09k Outlet temperature f cld liquid T c 346 k Q m c T c c lm 0.9 4. (346 308 143.74kw Rate f heat transfer Q 143.74kw Lgarithmic mean temperature distributin fr cunter flw heat exchanger(lmtd Thi Inlet temperature f ht fluid Thi Th T 383 k Outlet temperature f ht fluid h 360 k Tc 1 Inlet temperature f cld fluid T Tc c1 308 k Outlet temperature f cld fluid Density f il 850 kg 3 m U Overall heat transfer cefficient T T lm T 1 T1 ln( T T T T 1 h1 c T T T h c1 (383 346 (360 308 ln( 44.07 k (383346 (360 308 Area f shell A Q U T 0 lm 143.7410 A 350 44 A 9.318m 3 Effectiveness f heat exchanger U Tlm w 350 m k Lgarithmic mean temperature difference Q Ttal heat transfer 0.0084m Number f tubes Q mccc T d lm n Q=heat gain by the cld liquid=heat lss by the ht liquid 4 0.0084 4 4 (0.0 n d n 6.93 7tubes Vlume: 01 Issue: 03 Nv-01, Available @ http://www.ijret.rg 77 Area f tube mh v.5 0.0084m 850 0.35
IJRET: Internatinal Jurnal f Research in Engineering and Technlgy ISSN: 319-1163 Length f tubes A ndl 9.318 L 70.0 L 5.49m Input Shell uter diameter A DO L 9.318 0.540m 5.49 D 0.540m Effectiveness Cmax ( Th 1 Th C ( T T C C max min h1 c1 max f min min f h min max C h r Cc C r Cc C Cc m Cp 0.9 4. 3.78 c c C C m Cp.5.5 6.5 h h h Output Cc( Th 1Tc Ch( T T h1 c1 6.5(383 360 0.507050 3.78(383 308 0.507050 3. THERMAL ANALYSIS CALCULATIONS BY USING MATLAB. Fr thermal analysis calculatins by using Matlab prgram we have t prvide sme parameters like mass flw rate f ht liquid and cld liquid. Temperatures f inlet and utlet f ht liquid and inlet temperature f cld liquid. Vlume: 01 Issue: 03 Nv-01, Available @ http://www.ijret.rg 78
IJRET: Internatinal Jurnal f Research in Engineering and Technlgy ISSN: 319-1163 FLANGE Outer Diameter f the flange is 540mm Inner Diameter f the flange is 50mm Thickness is 10mm Outer diameter f the nzzle is 100mm Inner diameter f the nzzle is 80mm Fig 3: FLANGE 4. MODELING OF SHELL AND TUBE HEATEXCHNAGER USING PRO-E SHELL Outer diameter f the shell is 540mm Inner diameter f the shell is 50mm Thickness f the shell is 10mm Material we have taken fr shell is stainless steel Length f the shell 5.49m Inlet and utlet nzzle diameter f the shell is 100mm Thickness is 10mm BAFFLE END PLATE Diameter f the baffle end plate is 50mm Number f hles n the baffle end plate is 8 Hle diameter is 0mm Figure 4. BAFFLE END PLATE Fig SHELL BAFFLE PLATE Baffle cut is 5% Thickness f the baffle plate is 10mm Vlume: 01 Issue: 03 Nv-01, Available @ http://www.ijret.rg 79
IJRET: Internatinal Jurnal f Research in Engineering and Technlgy ISSN: 319-1163 5. THERMAL ANALYSIS USING FLOEFD By using the thermal analysis result that btained frm theretical frmulae. We have designed a Pr-e Mdel, and the materials we used fr thermal analysis fr tubes is cpper and shell is stainless steel because Cpper is ne f the best cnductrs f heat, while stainless steel is a medicre cnductr. Using cpper wuld increase the rate at which heat was transferred frm il t the water which is imprted int the FLOEFD sftware and started the analysis, the results that btained frm FLOEFD where represented by cntur plts. TUBE Fig 5:- BAFFLE PLATE Outer diameter f the tube is 0mm Inner diameter f the tube is 16.4mm Length f the tube is 5.49m Number f the tubes is 8 Figure 5.1:Cntur Plt Results f Temperatures f Inlet and Outlet temperatures f Ht and cld liquids. PRO-E Assembly Mdel Fig 6:TUBE Fig 7: Mdel f shell and tube heat exchanger Figure 5.:-Halfcutted Cntur Plt results that shwing the temperature f Outlet Ht il(yellw clr and Inlet Temperature f cld water(blue clr. Vlume: 01 Issue: 03 Nv-01, Available @ http://www.ijret.rg 80
IJRET: Internatinal Jurnal f Research in Engineering and Technlgy ISSN: 319-1163 Figure 5.3: Half cutted Cntur plt results that shwing the temperatures f Inlet Ht Oil(red clurand utlet temperature f cld water(greenish clur. CONCLUSIONS We have dne the thermal analysis f water t il type f shell and tube heat exchanger using Matlab and by using the utput that cme frm Matlab we have mdeled a shell and tube heat exchanger using Pr-e and imprted this mdel in Flefd sftware and we have run the thermal analysis and we cmpared the bth results and we are getting an errr f 0.0 3in effectiveness.by using abve prcess we can d the thermal analysis in less time and ur analysis reprt als mst accurate. ACKNOWLEDGEMENTS We thanks t ur Assc.Prf.R.Samsukumar fr prviding Necessary supprt ding this wrk. we acknwledge the diligent effrts f Ramgpal Varma Dandu,Applicant Engineer,Trident Tech Lab fr ding thermal Anaylsis. REFERENCES [1]Internatinal Jurnal f Ambient Energy, Vlume 31, Number 4Thermal analysis f cunterflw heat exchanger with a heat surce Assad, Ktiah [].http://www.cpper.rg/applicatins/rdbar/ally360/cu_ste el.html [3]. MNL 03A Issued 9 August 08, Prepared by J.E.Edwards f P & I Design Ltd, Teesside, UK www.pidesign.c.uk [4]Shah, R. K. and Seculik, D. P. Fundamentals f Heat Exchanger Design. Wiley: New Yrk, 0 0 3. [5].Fundamentals f Engineering Heat and mass transfer by R.C.Sachdva Vlume: 01 Issue: 03 Nv-01, Available @ http://www.ijret.rg 81