Heuristics. “Rules of Thumb”. Turton : Chapter 11. Use of Experience-Based Principles to:. Check new process designs Provide equipment size and performance estimates Help with troubleshooting problems with existing systems Verify computer simulations and results
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Use of Experience-Based Principles to:
Example: suppose you calculated a turbulent heat transfer coefficient inside
a 1.5” pipe as: , for water at 21OC and a velocity of 1.83 m/s.
Now, you need to estimate a heat transfer coefficient when the water temperature is 93OC and a velocity of 3.05 m/s.
Solution: assume still turbulent flow and that the viscosity and density of water may change significantly over this temperature range. So find appropriate equation for calculation of Nusselt number.
Let subscript 1 be old, 2 be new T
So for same diameter pipe; with water flowing; ignoring effects of T on
Estimate size of flash drum V-102
Estimate size of heat exchanger E-105
Estimate size of reboiler E-106
Homework: Problem 11.1 Turton