1. Irrigation Design and Heat Exchanger Design
Department of Mechanical Engineering, IUPUI Me 414 Thermal-Fluid Design Fall 2007
Irrigation Design and Heat Exchanger Design
Neil Barnes
Thomas Hylton
Lalit Kumar
Manan Langalia
Matt Zwiesler

2. Objective Design an efficient irrigation system for a given yard
Calculate and minimize utility and all other costs
Minimize wasted water
Calculate time to deliver one inch of water to the entire yard

3. Choosing a Sprinkler Head
Chosen based on size, type of spray, and cost
Need to spray in a generally uniformed and controlled area
Spray, over-spray, and wasted water needs to be taken into account

4. Head Placement in Yard 35’ radius heads were impact/ratchet heads
Poor design because low overlap and high cost sprinkler heads
Based on the tutorial ratchet along with spray heads is not recommended

5. Head Placement in Yard Design using 24’, 18’, and rectangular heads
Ruled out because of the pricing difference
Price difference between this and chosen design: $450.00

6. Head Placement in Yard Chosen to reduce costs
Only two different sprinkler heads (rectangular and 18’ head)

7. Square Head Decision Chosen as a result of less wasted water
Square spray heads would spray with uniform coverage and would not need to overlap
8 heads spaced uniformly in rectangular strip of yard
Toro 570 4x30’ Center Strip Nozzle

8. Piping Layout Reduce materials, bends, and joints
Sprinkler heads in each row in series and each row is in parallel
Parallel allows equal pressure loss in each branch of pipe with constant flow rate
Series allows equal flow rates in each branch, but pressure changes in each branch
Parallel allows for easy cleaning if blockages occur

9. Bill of Materials Part Individual Cost Quantity Total Cost
4" Sprayer P Rainbird (18')
$2.50 52
$130.00
Rainbird Nozzle
$1.20
$62.40
Toro 4x30 Nozzle (rectangular center strip)
$1.10 8
$8.80
Toro Sprayer for 4x30 Nozzle
$1.99
$15.92
Wilkins Backflow Preventer
$61.80 1
Rainbird DV Series Valve
$13.97 4
$55.88
ESP Indoor Controller
$84.95
PVC (pressure pipe)
$0.94/10 ft
1500 ft
$141.00
PVC elbow
$0.23 12
$2.76
PVC Tees 68
$15.64
Total
$579.15
Comparison
Rainbird Rotor Sprinkler (24')
$18.35 35
$642.25

10. AFT 1st Iteration (No zones)
High flow rates
Not enough pressure

11. AFT 2nd Iteration (2 zones)

12. AFT 3rd Iteration (4 zones)

13. ZONE 1 of 4

14. Final Results

15. Project 2
Heat Exchanger Design

16. Design Requirements Remove 1.2 MW of heat from process water
Inlet temperature 90 ◦C
Exit temperature 40 ◦C
City water
Inlet temperature during summer is 25 C
Minimize tube side and shell side pressure drops
Minimize cost due to weight and material used
Minimize the heat exchanger volume

17. Design Process DOE analysis with Matlab and Minitab Optimization
Initial DOE
Eliminate insignificant factors-down to 12 variables
Learn effects of change in variables
Final DOE
Four most significant variables chosen based on effect seen in main effects plots
Optimization
Four variables analyzed
Design goals met with optimal values

18. DOE process Run 2 sets of 6 initially
All variables related to effects on output variables:
Weight of HE
Shell-Side DP
Tube-Side DP
Q, heat transfer
List of final four variables:
Tube OD
Baffle Space
Tube Length
Shell ID

19. Main Effects Plots
DP Tube Plot
Q Calculated Plot

20. Main Effects Plots
DP Shell Plot
Weight Plot

21. Optimization
Pareto charts of Q and Weight
Minitab statistically equates effects of variables and interactions
Used to confirm main effects plots

22. Optimization Plots Initial optimization with custom tube od required
Final optimization with standard tube od

23. Results Critical Variables Value Baffle Space 0.50 m
Shell Inner Diameter
0.3048
12”
Tube Outer Diameter m
7/16”
Tube Length
4.545 m
Critical System Characteristics
Value
Heat Transfer Rate
1.2e6 W
Overall System Weight kg
Tube-side Pressure Drop Pa
Shell-Side Pressure Drop Pa

24. Summary Success Met 1.2 MW requirement Weight minimized
DP shell-side and tube-side minimized

25. Questions? ?