scott craig cody maher jesse ross brian vanstratum
TRANSCRIPT
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Scott CraigCody Maher
Jesse RossBrian Vanstratum
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Problem Statement How much power is in water flow? How do we generate power from water? How much power do we need? The Site Data From the Site Available Power vs. Needed Power
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Feasibility study Can we make enough
power, using this water source, to provide enough energy for one or more homes?
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Located in Reynolds, GA Is a large pond with a
dam on one side Minor Mill Pond is a
watershed for Panther Creek and a collection of artesian springs
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Maximum power from water flow depends on the flow rate and the pressure
The pressure is essentially the height the water falls, also called “head”
Thus the equation for max power is:P = mdotρgh, where mdot = mass flow rate and ρgh = water pressure
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Turbines are used to generate power from water flow and water pressure
There are 3 main variations on hydro-turbine design
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Fully immersed in water Convert water flow to
energy Work like a propeller Typically used in high
flow/low head situations
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Operate in air Convert water pressure
to energy Driven by high velocity
jets of water Typically used in low
flow/high head situations
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Cross-flow turbine Not entirely immersed
in water Generally operates like
an Impulse Turbine, but also converts water flow to energy
Typically used for low head/high flow
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Blender: 300W Coffee Maker: 800W Washing Machine:
500W Dryer: 5000W Central A/C: 2000 –
5000W Wall A/C: 1000W
Typical residential power requirements:
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Aerial view of the pond View of dam and mill house
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Minor Mill Pond
Spillway One
Spillway Two
Dam
Natural Spillway
Runoff
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Pond side Opposite side
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Pond side Opposite Side
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The Minor Mill Pond runs to the Patsiliga Creek which then dumps into the Flint River
The USGS has two gage stations monitoring flow rate one north of our site and one south of our site
By utilizing this data we can roughly estimate the flow from the surrounding tributaries
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Gage Station Data from the year 2004
The two stations show the average stream flow (Cubic Feet per second) for each month in 2004.
By taking the difference of flow rates we can determine the tributary contribution.
The flow from the Minors Mill Pond will be a fraction of that contribution.
We can then generate a fraction that represents the flow contribution from our site based on the flow rate data we collected on September 30th
2006.
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dt 1
1.6
1.9
1.4
1.7
1.3
1.45
1.45
1.6
1.5
1.76
1.71
1.3
1.7
1.9
1.45
1.45
1.6
1.4
1.4
1.4
s x 12 in
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Average velocity at the surface of the flow
To calculate the flow rate we need the average velocity of the flow
Neglecting the friction due to air, the velocity at the surface of the flow is the maximum value of the velocity distribution of the centerline of the flow.
A look at some hydraulics texts reveals some useful equations…
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vavg1
nRh
2
3 S0
1
2 Manning formula for open channel flow
vsurface vavg1
kvonKarmen
g h S0 Vanoni velocity distribution for open channel flow
We never measured the grade, SO but by virtue of two equations we can find it.
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0 0.05 0.1 0.15 0.20
0.1
0.2
0.3
0.40.379
1 103
y
0.1970v avg
1
k vonKarmeng h S 0 1 2.3 log
y
h
.1 m
h
yu y( )
d
h .1 m( )0.133
m
s
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Applying same methods from before:
v2 avg 0.376m
s
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Vdot1 804gal
min
Vdot2 1875gal
min
Vdottotal 2678.7gal
min
In order to minimize environmental effects we only want to use half the flow from spillway two
Vdotusable1
2Vdot2 Vdot1
Vdotusable 1741gal
min
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water 1000kg
m3 h 8.33ft
Pmax Vdottotal water g h
Pmax 4.209 103 W
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50%
Pusable Vdotusable water g h
Pusable 1.368 103 W
Pmonthly Pusable 31 day
Pmonthly 1.018 103 kW hr
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Determine what we can power with a middle Georgia micro hydro site
Very small neighborhood (7500 kW*hr/month) Just one house (1500 kW*hr/month) Preliminary useable power = 1018
kW*hr/month
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Decision Matrix
Options Cost Reliability Power Generated Environmental Impact Totals
*Max Power (Two Feet of Additional Head) 2 8 10 2 22
*Max Power (Current Head) 3 9 9 2 23
Spillway 2 Preservation with Renovation 3 9 6 8 26
Preserving Existing Dams 7 4 2 10 23
75% Reduction in Spillway 2 Flow
(Renovation) 3 9 8 6 26
*Max Power = Closing of Spillway 2 for max flow
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