Project 2: Heat Exchanger Design Group Members: Brian Schludecker Phillip Palmer Adam Spindler Mike Hay Joe McGuire Presented 12/12/2006 to Dr. Toksoy and ME 414 Class, IUPUI
Project Summary Design and optimization of heat exchanger Specifications & objectives Methods Results Conclusions
Heat Exchanger Specifications Heat exchanger length must not exceed 7 m Shell diameter must not exceed 2 m Shell mass flow rate: 120,000 kg/hr Water in shell must cool from 40 C to 25 C Water in tube enters at 20 C Ignore fouling
Objectives Maximize Q Minimize Weight (cost) Minimize heat exchanger pressure drop
Design Strategy Configure MATLAB files to analyze the heat exchanger Modify input factors until heat transfer ratio is close to 1 Run DOE in MATLAB and Minitab to calculate optimal values for system
Design Factors Tube outer diameter Shell inner diameter Tube length Number of tube passes Material Pitch Number of Baffles Baffle Spacing
Design Factors for DOE Tube outer diameter Shell inner diameter Tube length Number of tube passes Material Pitch Number of Baffles Baffle Spacing
Design Decisions Pitch = 1.25 * Tube outer diameter 0 baffles
Interaction & Main Effects Plots (to find Critical Factors)
Mean Effects Plots
Pareto Charts
Design Decisions Critical factors: Length, Shell ID, Tube OD Material: Aluminum (cost, weight) 1 pass
Optimized Results +/- 20% Using guesses (from Matlab): Optimized results are not standard Size ID and OD, choose close sizes:
Optimized Specifications Tube OD = mm Shell ID = m Length = m
Final Results Q maximized2.099E6 W dP in shell minimized463 Pa dP in tube minimized1500 Pa Weight minimized1108 kg
Conclusions Minitab optimized values for ID and OD are not standard tube/shell sizes, need to adjust Minitab results Objectives achieved Further analysis possible for multiple passes/baffles Questions?