58147251 design of plate frame heat
TRANSCRIPT
Design of Plate Frame Design of Plate Frame HeatHeat
ExchangerExchangerAdil Akbar(Me-029)Arsalan Hanif(Me-035)Muhammad Bilal(Me-027)Usama Najeeb(Me-080)
Final year ProjectBatch 2007-2008
ObjectiveObjective To design a plate frame
heat exchanger to achieve the desired heat transfer duty with minimum pressure, drop and to keep the design
as close as possible to the .actual design
Milestones CompletedMilestones Completed
Remaining MilestonesRemaining Milestones
Literature StudyLiterature Study
Lite ra tu re S tu d y. . . . .co n tin u e s
Executed WorkExecuted WorkApplication/Design SpecificationFunction: - To pre cool milk using water for
.pasteurization
Warm side Cold side
Fluid Milk Water
Inlet temp 50°C 32°C
Outlet temp 35.88°C 41.38°C
Max. allowable pressure drop
0.22bar 0.44bar
Mass flow rate 3.103kg/s 4.130kg/s
Executed Work Executed Work Continues.....Continues.....Introduction to Thermal Design
ProcedureLimited literature is available as design equations and correlations are usually company secret.
Design softwares are not easily available.We have used correlations developed by scientists through research work namely Kumar(1984), Talik(1995) and Focke(1985).
Chevron angle for Talik and
.Focke
Chevron angle .for Kumar
Executed Work Executed Work Continues.....Continues..... Effect of changing chevron angle using Kumar correlation
Angle U( /W m2. )K
No.plates
No.passes
P_tm(bar)
P_tw(bar)
30° 1266.6 45 2 0.2014 0.2831
45° 1266.6 45 2 0.08516 0.1146
60° 850.67 67 3 0.06418 0.08517
EExecuted Work Continues.....xecuted Work Continues.....Graph between chevron angle and overall heat transfer coefficient.
Graph between chevron angle and total pressure drop for milk.
Graph between chevron angle and total pressure drop for water.
Executed Work Continues.....Executed Work Continues.....
° Results derived from these graphs is that 45 is optimum angle as overall heat transfer coefficient is maximum and
.pressure drop is moderate
Executed Work Continues.....Executed Work Continues.....Comparison of Kumar, Talik and Focke correlations.
Correlations U(W/m2.K)
No.plates
No.passes
P_tm(bar)
P_tw(bar)
Kumar(45°) 1266.5 45 2 0.08516 0.1146
Talik(60°) 1266.5 45 2 0.03190 0.09412
Focke(45°) 2478.5 23 1 0.05609 0.1152
Executed Work Continues.....Executed Work Continues.....
Kumar and Focke correlations verify that 45° is an optimum chevron angle.
Executed Work Continues.....Executed Work Continues.....Effect of varying plate size at chevron angle of 45°using Kumar correlation.Size Width(m) length(m) Port
Dia(m)1 0.15 0.7 0.082 0.30 0.50 0.123 0.30 0.80 0.124 0.40 0.80 0.155 0.40 1.20 0.156 0.60 1.00 0.157 0.60 1.40 0.158 0.80 1.00 0.189 0.80 1.40 0.1810 0.80 1.60 0.18
= , = .b 4mm plate thickness 0 65mm
Executed Work Continues.....Executed Work Continues.....
Size U(W/m2.K)
No.plates
No.passes
P_tm(bar
P_tw(bar)
1 1681 155 7 .1 0220 .1 3847
2 1371.3 133 6 .0 1803 .0 2442
3 1280.8 89 4 .0 1912 .0 2583
4 1276 67 3 .0 0853 .0 1151
5 1266.6 45 2 .0 0851 .0 1147
6 1013.2 45 2 .0 0345 .0 0466
7 1416 23 1 .0 0241 .0 0325
8 759.9 45 2 .0 0206 .0 0277
9 1062 23 1 .0 0143 .0 0193
10 929.3 23 1 .0 0164 .0 0221
Result of varying plate size
Executed Work Continues.....Executed Work Continues.....
Executed Work Continues.....Executed Work Continues.....
We arbitrarily selected size no.5 as a suitable plate size for our calculations.
Executed Work Continues.....Executed Work Continues.....
The results obtained using Kumar’s correlation are in accordance to the data obtained from Engro Foods.
Also Kumar is the most widely used correlation for plate frame heat exchanger.
Summary Of Thermal Design
Kumar U(W/m2.K)
No.plates
No.passes
P_tm(bar)
P_tw(bar)
Plate Width(m)
Plate length(m)
Port Dia(m)
45° 1266.5 45 2 0.085160.1146 0.4 1.2 0.15
Plan to do Remaining WorkPlan to do Remaining Work
Plan to do Remaining Work Plan to do Remaining Work cont.....cont.....
HEAT TRANSFER REGION ASSEMBLY( )plates and gaskets
( SUPPORT ASSEMBLY support, , brackets clamping plates
, tie rods tightening )bolts and nuts etc
ReferencesReferences ( Plate Heat Exchangers Design Application and
) . , . . . Performance by L WANG B SUNDEN and R MMANGLIK
Heat Exchangers by Sadik Kakac 2nd Edition CRC.Press
Heat Exchangers by Holger Martin CRC Press 1 edition
. C om pact H eat Exchangers by JEH ESSELG R EAV ES
IndustrialH eat Exchangers A B asic G uide 2 nd Edition by G Walker
Introduction to Food Process Engineering By P .G Smith