Uiy

prv~

Case Where R, Approaches Infinity

Again, as Rv becomes very large, the preceding equation becomes simpler:

V/Pc

Pv K dPc

Pc 5

15.3 REBOILERS—OPEN-LOOP DYNAMICS

We wish to make an analysis of column bases with associated reboilers where there is significant liquid holdup. The analysis should take into account the temperature of the entering liquid and the sensible heat effect of the liquid mass. Such an analysis also applies to vaporizers with associated separators or knockout drums.

Heat-Transfer Dynamics

The combination of thermosyphon reboiler (or any high circulation rate reboiler) and column base or separator may be represented as shown schematically in Figure 15.7. The various equations may then be written as follows.

Heat Balance wit) cp T,(t) + qT(t) - (wBU{t) [Xf + cp TBU{t) ]

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