1. Heat Exchanger Control Systems

2. Some Types of Heat Exchangers
Sensible Heat Cooling and Heating
Change of Phase Boilers and Condensers
Partial Condensing or Partial Vaporization
Wiped Film Units for Viscous Fluids

3. Basic Model 𝑄=𝑈𝐴Δ𝑇 Simple Heater Loop 𝑄=𝑆𝜆=𝐹 𝑐 𝑃 ( 𝑇 2 − 𝑇 1 )
Actual loop on P&ID
Riggs & Karim, Chemical and Bio-Process Control, 2006, p. 12

4. Control Loop Options Feedback has some lag time
Feedforward based on steady state process
Perry, Chemical Engineers Handbook, 7th Ed., p. 8-17

5. Alternate Methods Bypass Control Options
Combined Feedback & FeedForward
Marlin, Process Control Designing Processes and Control Systems for Dynamic Performance, 2000, p.784
Riggs & Karim, Chemical and Bio-Process Control, 2006 p. 401

6. Physical Installation
Cascade control

7. Change of Phase HX Condenser on Distillation Column

8. Change of Phase HX Partial Condenser on Distillation Column

9. Change of Phase HX Reboiler on Distillation Column

10. Condenser Pressure Control
Towler & Sinnott, Chemical Engineering Design Principles, Practice and Economics of Process Design, 2008, p. 279

11. Steam Boiler Control Steam Pressure is used to control fuel feed rates
Can be linked to consumer

12. Actual Boiler Control Systems
Allow for capacitance in system

13. Boiler Drum Level Control
Can use feedback, feedforward & combination
Riggs & Karim, Chemical and Bio-Process Control, 2006, p. 12

14. Partial Condenser Options
Can control reflux rate
William L. Luyben, Alternative Control Structures for Distillation Columns with Partial
Condensers, Ind. Eng. Chem. Res. 2004, 43,

15. Partial Condenser Options
Can control condenser cooling rate
William L. Luyben, Alternative Control Structures for Distillation Columns with Partial
Condensers, Ind. Eng. Chem. Res. 2004, 43,

16. Partial Condenser Options
Can control reflux ratio
William L. Luyben, Alternative Control Structures for Distillation Columns with Partial
Condensers, Ind. Eng. Chem. Res. 2004, 43,

17. Wiped Film Evaporator Control product feed rate