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Chapter 13 Pinch Technology

Chapter 13 Pinch Technology. Don Scott 3/9/6 ENCH 430. Pinch Point. In a system, a point where energy or mass exchange is at a minimum is the pinch point. A pinch point needs to be located and used to design the system. Heat Integration- Matching points of heat addition and heat loss.

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Chapter 13 Pinch Technology

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  1. Chapter 13Pinch Technology Don Scott 3/9/6 ENCH 430

  2. Pinch Point • In a system, a point where energy or mass exchange is at a minimum is the pinch point. • A pinch point needs to be located and used to design the system.

  3. Heat Integration- Matching points of heat addition and heat loss • Choose a minimum approach temperature. • Construct a temperature interval diagram. • Construct cascade diagram-minimum utility requirement, pinch temperatures. • Calculate minimum no. of heat exchangers above and below pinch. • Construct the heat exchanger network. Pages 462-473

  4. Estimate Area • A=(Q)/(U*delta Tlm*F) • A: heat transfer area • Q: amount of heat to be transferred • U: film heat transfer coefficient • delta Tlm: log-mean temperature. • F: log-mean temperature correction factor

  5. Equivalent Annual Operating Cost • EAOC=FCI(i(1+i)n)/((1+i)n-1)+utility costs • FCI= total cost of network • ‘n= number of years • i=before tax hurdle rate

  6. Other considerations • Material • Operating pressure • Multiple Utilities • Phase Changes

  7. Mass Exchange • Analogous to heat exchange. • Pages 500-509

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