Category Archives for Design

Kettle Reboiler

The tube bundle is immerged in a pool of liquid at the base of the column in an oversize shell (Figure 1.11). Kettle reboiler is also called a “submerged bundle reboiler”. The height of the tube bundle is usually 40-60% … Continue reading

12. June 2018 by Ben
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Forced Circulation Reboiler

The liquid is fed by means of a pump. Forced circulation reboilers with vertical or horizontal tubes boiling may be designed. Forced circulation reboilers are similar to vertical thermosiphon reboilers, except the pump is used for the circulation of the … Continue reading

12. June 2018 by Ben
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Thermosyphon natural circulation reboiler

The boiling occurs inside the tubes in vertical thermosyphon reboiler and inside shell in horizontal thermosyphon reboiler (Figure 1.10). In vertical thermosyphon reboiler, the liquid circulation occurs due to density difference between vapor-liquid mixture (two phase) in the exchanger from … Continue reading

12. June 2018 by Ben
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Types of condensers

There two general types of condensers: Vertical condenser Downflow vertical condenser: The vapor enters at the top of condenser and flows down inside tubes. The condensate drains from the tubes by gravity and vapor induced shear (Figure 1.7). Upflow vertical … Continue reading

12. June 2018 by Ben
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Condenser

The change from liquid phase to vapor phase is called vaporization and the reverse phase transfer is condensation. The change from liquid to vapor or vapor to liquid occurs at one temperature (called saturation or equilibrium temperature) for a pure … Continue reading

12. June 2018 by Ben
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Selection of fluids for tube and the shell side

The routing of the shell side and tube side fluids has considerable effects on the heat exchanger design. Some general guidelines for positioning the fluids are given in Table 1.4. It should be understood that these guidelines are not ironclad … Continue reading

12. June 2018 by Ben
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Fouling Thermal Design Considerations

The most of the process fluids in the exchanger foul the heat transfer surface. The material deposited reduces the effective heat transfer rate due to relatively low thermal conductivity. Therefore, net heat transfer with clean surface should be higher to … Continue reading

12. June 2018 by Ben
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Baffles Thermal Design Considerations

Baffles are used to increase the fluid velocity by diverting the flow across the tube bundle to obtain higher transfer co-efficient. The distance between adjacent baffles is called baffle-spacing. The baffle spacing of 0.2 to 1 times of the inside … Continue reading

12. June 2018 by Ben
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Shell Thermal Design Considerations

Shell is the container for the shell fluid and the tube bundle is placed inside the shell. Shell diameter should be selected in such a way to give a close fit of the tube bundle. The clearance between the tube … Continue reading

12. June 2018 by Ben
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Tube Sheet Thermal Design Considerations

The tubes are fixed with tube sheet that form the barrier between the tube and shell fluids. The tubes can be fixed with the tube sheet using ferrule and a soft metal packing ring. The tubes are attached to tube … Continue reading

12. June 2018 by Ben
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