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MANSUR HE
MARCELA CEDEÑO
JAYG DIMAYACYAC
HAILY GADA
LIAM HILDER
CHRISTOPHER TONG
Photo source: textureX.com
APSC 101 CAPSTONE
RAINWATER HARVESTING SYSTEM
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APSC 101 T2
1• Solutions
2• Alternative Designs
3• Justifications
4• Recommendations
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42 m3 STORAGE TANK
HOUSE
LAYOUT A
FULL ROOF +
ADDITIONAL 150m2
APSC 101 T2
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LAYOUT A
10m3 COLLECTION TANK
PIPINGS
6 SW-80
SOLAR PANELS
1 BATTERY
AC INVERTER
APSC 101 T2
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LAYOUT A
ALL FILTERS
50W UV SYSTEM
PUMP A
APSC 101 T2
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LAYOUT B STORAGE TANK
APSC 101 T2
Additional Height
Increased Potential Pressure
Increased Piping
Increased Pressure Loss
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• Catchment on top
• No pump required
• No collection tank required
• No roof collection area
• More expensive collection area
• Purely relies on gravity
APSC 101 T2
LAYOUT C
STORAGE TANK
CATCHMENT
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APSC 101 T2
20%
25%10%
15%
15% Consumption
Relative Cost
Environmental
Maintenance Occurance
On Demand Flowrate
Reliability
STUDY PROBLEM
SATISFACTION WEIGHTS
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APSC 101 T2
STUDY PROBLEM IDENTIFY SOLUTION
Used excel to find solutions with
the best satisfaction
Used real testing and prototyping
via experiments
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APSC 101 T2
STUDY PROBLEM IDENTIFY SOLUTION TEST & IMPLEMENT
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Consumption, 97.8%
Relative Cost, 89.6%
Environmental, 100.0%
Maintenance Occurance, 97.5%
On Demand Flowrate, 98.9%
Reliability, 99.7%
0.0%
25.0%
50.0%
75.0%
100.0%
APSC 101 T2
SATISFACTION
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APSC 101 T2
82m PIPING12m PIPING
X: 10
Y: 5
Z: 5
X: 76
Y: 12
Z: 27Layout A Layout B
Smaller pressure
lost due to
piping
More pressure
lost due to
piping
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APSC 101 T2
WATER CONSUMPTION
88%
96%
94%
82%
84%
86%
88%
90%
92%
94%
96%
98%
0%
5%
10%
15%
20%
25%
400L 580L 625L
Consumption Cost Reliability Overall
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COLLECTION AREALayout A
• Uses roof and additional area
• Small area
• Less expensive
Layout C
• Only additional area
• Located higher
• Farther – more pressure loss
• More Expensive
APSC 101 T2
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APSC 101 T2
250m2 TOTAL COLLECTION AREA
100m2 whole roof150m2 additional area
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APSC 101 T2
COLLECTION AND STORAGE TANK
35000L10000L
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CATCHMENT TANK
• Options in fixed increments, must satisfy volume
• Must be greater than consumption to prevent overflow and satisfy needs
• Defines maximum Q in for the system of days
APSC 101 T2
10000L$2,000
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Storage Tank
• Pay per unit of volume, remainder from Total
Tank Size
• Cost the minimum possible in order to maintain
water in system during low rainfall periods
APSC 101 T2
STORAGE TANK
35000L$10,500
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NO TOWERS
APSC 101 T2
$96,372
$55,698
Total expense with identical parameters
+$40,674
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APSC 101 T2
PUMP CHOICE
A B C
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APSC 101 T2
0.00
50.00
100.00
150.00
200.00
250.00
300.00
350.00
400.00
450.00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00
Flowrate [LPM]
Pressure [kPa]
37 LPM
126 kPa
System
Pump A
Pump B
Pump C
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APSC 101 T2
$580.00
$1,400.00
$3,500.00
Pump A Pump B Pump C
Cost of pump per replacement
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APSC 101 T2
FILTERS
200µm Bag Filter 5µm Bag Filter 1µm Bag Filter
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APSC 101 T2
199
138
59
Only 1 Only 1 and 200 All
Maintenances
90%
94%
96%
Only 1 Only 1 and 200 All
Satisfaction
$14,925
$8,875
$10,900
Only 1 Only 1 and 200 All
Replacement Cost
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APSC 101 T2
FILTER DIRECTION
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• Highest flow rate – 35 LPM
• Does not limit on-demand flowrate
• Placed downstream
• Same replacement time compared to 36W
• More expensive
• Increased energy usage
UV DISINFECTION SYSTEM
50W
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Energy Required by System
• Energy to pump and filter water
• Energy to convert current from DC to AC (Inverter)
• Divided out by energy inefficiencies
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Calculating Power Out
- Pump Power: Dependent on Water collected in Catchment Tank
- Inverter: Runs with Pump
- UV: Constant Power of 4500 kJ/day
Total Electrical Energy Used:
4500 kJ/day < Energy < 5400 kJ/day
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Calculating Power In
Six Solar Panels :
5400 kJ/day
One Battery :
7200 kJ/day
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APSC 101 T2
ON DEMAND FLOW RATE
• Still has high satisfaction (99%)
• More expensive method required for 30 LPM
29 LPM 30 LPM
Cannot be satisfied using
selected location
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EXPENSES (5 YEARS)
APSC 101 T2
Initial Cost,
$36,973.00
Water Import Costs,
$4,125.00
Replacements,
$14,425.00
$36,073.00
$50,000.00
$9,825.00
$16,000.00
$9,800.00 $12,495.00
Layout A Layout B
Initial Costs Water Import Costs Replacements
$55,700 $78,500
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Replacement
Costs
• Filter – 75 Times/5
Years
• Pump not expected to
be replaced
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Days Without
Service• $75 per day to ship
water
• 55 Days without water
Expense Total Cost
Water Import $4 125
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FINAL RECOMMENDATION
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1 LEAD ACID BATTERY
50W UV DISINFECTION SYSTEM
APSC 101 T2
FULL ROOF + 250m2
ADDITIONAL RAINWATER
COLLECTION AREA
10000L RAIN WATER
COLLECTION TANK
35000L STORAGE TANK
LOCATED AT X = 10, Y = 5
PUMP A
ALL FILTERS APPLIED
Collection to storage
6 SW-80 SOLAR PANELS
DC TO AC INVERTER REQUIRED
FOR COMPONENT OPERATIONS
DAILY CONSUMPTION OF 580L
AND ON DEMAND FLOWRATE OF
29 LPM
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APSC 101 T2
CONCLUSION