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