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MEE 452: Example 3-2

Shell-and-Tube Heat Exchanger Analysis: [From B.K. Hodge and R.P. Taylor, Analysis and Design of Energy System, 3rd Ed. , Prentice Hall, 1999]

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MEE 452: Example 3-2

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  1. Shell-and-Tube Heat Exchanger Analysis: [From B.K. Hodge and R.P. Taylor, Analysis and Design of Energy System, 3rd Ed., Prentice Hall, 1999] Counter-flow, single-pass: 80 copper tubes, 1 in, no. 18 BWG in staggered array ST=SL=2 in. Shell 1.7 ft ID, 30 ft long with 20 baffles and 10 tubes along C.L. Shell fluid: 50,000 lbm/hr water @50oF in. Tube (hot) fluid: 66,000 lbm/hr n-butyl alcohol @150oF. MEE 452: Example 3-2 Two-tube-passfor illustration only

  2. COUNTER FLOW PARALLEL FLOW Cmin=min(CH,CC) T T HOT FLUID DT1 DTH DTH HOT FLUID DT DTmax DT1 DTLM DTLM DT DT2 DTC DT2 DTC COLD FLUID COLD FLUID dA dA A A Heat Exchanger Correlations

  3. Tube arrangement in shell Think of your geometry and calculate your fluids’ cross-sectional areas and velocities, etc ...

  4. Parallel and Staggered arrangement

  5. Friction factor for staggered tubes PT=ST /D PL=SL /D

  6. MathCAD S&T HX analysis 1 of 7 Fluids’ properties etc ...

  7. MathCAD S&T HX analysis 2 of 7 Fluids’ passage geometries, etc ...

  8. MathCAD S&T HX analysis 3 of 7 Reynolds’, Nu’s, & h’s, etc ...

  9. MathCAD S&T HX analysis 4 of 7 Thermal resistances, conductance, etc ... q=(DT/R)any=constant ...

  10. Fluid properties (var. T) corrections MathCAD S&T HX analysis 5 of 7 UA, NTU &e=

  11. HX effectiveness e= Qduty & Th/c,out MathCAD S&T HX analysis 6 of 7 Tube-side Pressure drop ... or 16/Re otherwise

  12. Tube-side Pressure drop ... MathCAD S&T HX analysis 7 of 7 Shell-side Pressure-drop ...

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