ISSN:
1750-3841
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
SUMMARY A combined feedforward-feedback system is proposed to reduce fouling in a vertical long-tube tomato evaporator. Development of the appropriate heat and mass transfer equations under conditions of changing feed composition and constant evaporator temperature indicated that perfect control can theoretically be maintained by feedforward control of flow rate. Derivative and proportional control are required. Fouling in the evaporator tubes and uncertainties of process dynamics necessitate the addition of integral and proportional feedback control to the feedforward system. The proposed evaporator-control system was simulated on an analog computer. The results proved that excellent control of the product can be maintained in single-pass operation with feedforward-feedback control.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2621.1971.tb15161.x
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