The partially flooded reboiler is similar in many ways to the partially flooded condenser. Usually, although not always, it is a vertical thermosyphon reboiler. As discussed in Chapter 4, Section 2, it is controlled by throttling the steam condensate, which in turn varies the condensate level in the shell and thereby the heat-transfer area for condensation. That area covered by liquid permits only sensible heat transfer from the condensate; this is a small heat load compared with that of the condensing steam and is treated as negligible.
The signal flow diagram of Figure 15.5 for a flooded condenser may be used as a starting point. In this case pressure dynamics are essentially negligible. If the steam supply pressure is constant, the steam condensing temperature is also constant.
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