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Shell and tube Heat Exchanger  MECN 3037 – Fundamentals in Engineering Heat Transfer 11 October 2021

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Lehlologelo  Mello Mveli   Mofutsanyana Tshiamo  Madiba Goitseona   Taukobong  1916203

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Heat transfer in a heat exchanger Applications of heat exchanger  Industrial Waste Heat Recovery in heat process plants Increases the efficiency of the plants

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Shell and Tube Heat exchanger One Pass Single Phase

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How does the number of the baffles in the heat exchanger influence heat transfer and pressure drop.

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Baffles are in a heat exchanger to hold the tubes. Main application is to induce cross flow of the fluid. They are known to also create turbulence which influence heat transfer.  Maximising heat transfer is important in the heat recovery.  Also they must investigated on how they influence pressure drop. Pressure drop increasing the pumping costs.

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Simscale  was used to run conjugate heat transfer in the heat exchanger. Every parameter of the heat exchanger was kept constant. Size. Inlet velocities Inlet Temperatures Pressure Outlets Only changing the number of baffles.  From 2,4,6. Then heat transfer and pressure drop characteristics of all configurations.

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(K)
•n 15
461.15
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07.15
'2515
3015
37715
36515
3B 15
341±
32915
317.15
30515
29315

473.15
449.15
42515
01.15
38915
36515
353%
317 '5
30515

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473, 15
481817
436.15
411483
3B 15
374483
325 IS
312817
20 15

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pressue (Pal
104534
104109
103684
103259
102834
102409
101984
101559
101134
100709
Inu
994341
99009.1
*1591

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Heat Absorb(qc)(W) -6 Baffel TWO FOUR SIX 370974.96849915083 400521.64740616287 459615.0052201869

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Pressure Drop (Pa) TWO FOUR SIX 6375 6376.6999999999971 6381.1000000000058

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It is seen that as the number of baffles increases, the amount of heat transferred in the heat exchanger increases.  The increase of baffle numbers introduces more turbulence.  The more heat is absorbed by the cold fluid. As the number of baffles increase the pressure drop of the shell side.  Implications of these is that to get more heat transfer through the use of baffles, increases the pressure drop meaning that more pumping power is required.

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Increasing the number of baffles increases the amount of heat transferred.  Increasing the number of baffles increases the pressure drop.

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Prasanna et al show the same observation as the pressure drop and the amount of heat transfer increases with the increase in the number of baffles. This is also backed up Han et al mentions that turbulence increases the heat transfer coefficient, meaning that it increases the rate of heat transfer. From this it implies that the more baffles inserted in a shell and tube heat exchanger, the more heat is transferred.

Heat Exchanger Simulation

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