floating ball valve
DESCRIPTION
Floating Ball Valve. Team DHMO: Barry Schnorr David Harrison Justin Ferrentino Haixian Huang. Introduction. Create a flow control device that: Controls a constant flow rate of 20 L/day Is inexpensive to manufacture Can be connected after a slow sand filter (resistant to clogging) - PowerPoint PPT PresentationTRANSCRIPT
Floating Ball ValveFloating Ball Valve
Team DHMO:Team DHMO:Barry SchnorrBarry Schnorr
David Harrison David Harrison Justin FerrentinoJustin FerrentinoHaixian HuangHaixian Huang
IntroductionIntroduction Create a flow control device that:Create a flow control device that:
Controls a constant flow rate of 20 Controls a constant flow rate of 20 L/dayL/day
Is inexpensive to manufactureIs inexpensive to manufacture Can be connected after a slow sand Can be connected after a slow sand
filter (resistant to clogging)filter (resistant to clogging) This requires control of flow before the This requires control of flow before the
water level of constant headwater level of constant head
23
4 where
6 tcw
fw
t
fc dA
hd
A
Floating Ball Valve Floating Ball Valve CalculationsCalculations
Float constraint:Fbuoyant – Fgravity > Fpressure
df
ρf
ρw
htdt
Head Loss TubingHead Loss Tubing
So: use 1m of 1/16 in. inner-diameter tubing to achieve 17cm of headloss
ComponentsComponents
• Racquet Ball• 1/4” Steel Tubing•1/4” PVC Tubing•1/16” PVC Tubing
CostsCostsItemItem Approximate Approximate
CostCostSoda BottleSoda Bottle $ 0.05$ 0.05Racquet BallRacquet Ball $ 0.50$ 0.50
1/4” Steel 1/4” Steel TubingTubing
$ 0.15$ 0.15
1/16” PVC 1/16” PVC TubingTubing
$ 0.25$ 0.25
Bucket Bucket (reservoir)(reservoir)
$ 2.00$ 2.00
TotalTotal $2.95$2.95
Device in OperationDevice in Operation
Results from TestingResults from Testing
Graph of Flow Rate vs. Reservoir Water Level
0.0
5.0
10.0
15.0
20.0
25.0
0 5 10 15 20 25 30
Water Height (cm)
Flow
Rat
e (L
/day
)
Results Cont’dResults Cont’d
19.0
19.1
19.2
19.3
19.4
19.5
0 5 10 15 20 25 30
Water Height (cm)
Flow
Rat
e (L
/day
)
Graph of Flow Rate vs. Reservoir Water Level
Results Cont’dResults Cont’d
Graph of Flow Rate vs. Tube Height (Range of Flow Rates Produced)
05
1015202530354045505560
0 5 10 15 20 25 30 35 40 45 50
Tube Height (cm)
Flow
Rat
e (L
/Day
)
Actual Expected
Results Cont’dResults Cont’d
Flow Rates of Dirty Water over Time
19.0
19.5
20.0
20.5
21.0
21.5
22.0
0 100 200 300 400 500 600
Time Running in Device (min)
Flow
Rat
e (L
/day
)
Clean Water
Dirty Water
Results SummarizedResults Summarized
Flow rate varied ~ 0.5 L/day from Flow rate varied ~ 0.5 L/day from height change of water in bucketheight change of water in bucket
As built, device was able to provide As built, device was able to provide flow rates from around 5 to 50 L/dayflow rates from around 5 to 50 L/day
Over the time device was tested with Over the time device was tested with dirty water, it did not appear to be dirty water, it did not appear to be significantly affectedsignificantly affected
ConclusionsConclusions Easy to constructEasy to construct Easy to calibrateEasy to calibrate Able to produce flow rates over a Able to produce flow rates over a
large rangelarge range Able to produce roughly constant Able to produce roughly constant
flow from a filled 5 gallon bucketflow from a filled 5 gallon bucket
RecommendationsRecommendations
Long term testing with dirty waterLong term testing with dirty water Standardized constructionStandardized construction
Screw apart bottle for cleaningScrew apart bottle for cleaning Plastic rather than steel tube (save costs)Plastic rather than steel tube (save costs) Way to attach head loss tubing simplyWay to attach head loss tubing simply Bottle mounting w/ SSFBottle mounting w/ SSF