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Jim Hahn Kelly McCormick Jeff Snyder Andrew Taylor Nathan Wagers ME 414: Thermal/Fluid Systems
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Design an efficient yard irrigation system where cost, delivering time, and wasted water are all minimized. http://www.popularmechanics.com/home_journal/gardening 12/11/07
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Minimize: Equipment Costs Delivering Time Wasted Water Electric Utility Costs Even Distribution of 1 inch Depth of Water
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Back (Zone 1) Front (Zone 2) Drive (Zone 3) Area 8400 ft 2 3980 ft 2 1080 ft 2 Volume 700 ft 3 332 ft 3 90 ft 3 Gallons 5236.42481.0673.2 Minutes 1357665 GPM 38.732.7610.4
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3 Zones: Driving Force is Geometry Source of Water: Central Location Assume Infinite Flow 60 psig available 100% Overlap to Ensure Satisfactory Water Distribution Eliminate Spray outside of Yard Boundaries Need for Several Sizes of Sprinkler Heads
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Rainbird Sprinkler Heads Pressure (psi) Radius (ft)GPMInletAdjustment# 42SA All Purpose Rotor25 26-38 (35)2.58 3/4" NPT Female25%15 22SA-F Full Rotor23 17-24 (18)2.6 1/2" NPT Female--6 22SA-F Half Rotor23 17-24 (18)2.6 1/2" NPT Female--13 22SA-Q Quarter Rotor23 17-24 (18)2.6 1/2" NPT Female--9
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Jim Hahn Kelly McCormick Jeff Snyder Andrew Taylor Nathan Wagers ME 414: Thermal/Fluid Systems
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Design Shell and Tube Heat Exchanger to Use City Water to Remove 1.2M Watts from Process Water. Process Water Inlet Temperature 90° C Outlet Temperature 40° C City Water Inlet Temperature 25° C
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Meet 1.2M Watts of Thermal Requirement Minimize Tube Side & Shell Side Pressure Drops Minimize Raw Material Cost, By Weight Minimize Heat Exchanger Internal Volume HE Length Should Not Exceed 8 Meters.
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Matlab HE Design Program Used to Perform Calculations Based on Known Design Parameters. Minitab Used to Perform Statistical Analysis of “Design of Experiment” Studies Performed with Matlab Program.
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Tube OD Tube Length Tube Thickness Tube Layout & Angle Tube Material Tube Pitch Shell ID Shell Material Shell Thickness City Water Flow Rate Counter or Parallel Flow City Water Flow Side Baffles – Yes or No Baffle Spacing
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Used to Eliminate Variables with Little Effect on Main Criteria
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Used to Identify Variables which Interact to Affect Main Criteria
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Used to Identify Variables’ Relative Level of Effect on Main Criteria
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Four Final Variables Identified and Used to Optimize Two Final Designs Design #1 – Optimized for Pressure Drops Design #2 – Optimized for Weight & Cost
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DESIGN #1 – DELTA P OPTIMIZEDDESIGN #2 – WEIGHT OPTIMIZED Thermal Capacity: 1.2M Watts Material Weight: 109.9 Kg Total Weight: 374.9 Kg Material Cost: $120.91 Volume: 1.13 m 3 Delta P Shell: 628.9 Pa Delta P Tube: 167.6 Pa Thermal Capacity: 1.2M Watts Material Weight: 73.1 Kg Total Weight: 228.7 Kg Material Cost: $80.36 Volume: 1.01 m 3 Delta P Shell: 701.3 Pa Delta P Tube: 933.7 Pa
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Toksoy, John. ME 414 Thermal-Fluid Systems Design. Department of Mechanical Engineering, IUPUI, Indianapolis, IN, Fall 2007. Kakaç, S., Hongtan, L. Heat Exchangers: Selection, Rating, and Thermal Design. 2 nd Ed., CRC Press LLC, Boca Raton, FL, 2002, 7 Dec 2007.
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