10'

20'

30'

10'

20'

WL

PSP

0

0 20' 40'WL

10' 30'

Section of Notional “Rho-Cee” WEC for Portugal

Reinforced concrete structure

Dimensions in feet

Resonant Center Periods

5.2 sec (42m)

6.9 sec (74m)

8.8 sec (121m)

Composite concrete floats

Hydraulic power take-off

Cylinder support structure TBD

28 kW/m average output

60 kW/m (?) rating

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~1/6th scale “Rho-Cee” being prep’d for absorption test at Ohmsett facility

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Generic ρC – Scalable: L ~ T2

Three one/third Octave Bands dimensions in feet

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Incident Energy Spectrum for Rayleigh Distributed Wind P-M Spectra

with a Candidate 3/3 Octave Pass Band

0

20

40

60

80

100

120

140

3.2 4.0 5.0 6.3 8.0 10.0 12.5 16.0 20.0 25.0 32.0 40.0

1/3 OB period, sec.

1/3

OB

MW

-hr/

m-y

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Yearly Cost Function – very preliminary

$/m = 2400 + 2500 [ 17.07(Tm/Tr)4 +

38.25(Tm/Tr)2 ] x 0.08 +1500*kW x 0.133

maintenance

PTO @ 5.5% for 15 yrs for average

input power Tm, max band period

Tr, ref T, here 12.5 sec

PTO & WEC structure alone

$/m3 reinforced concrete structure bulkheads

partitionsstructure @ 5.5%

for 20 yrs

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Cents per kW-hr vs Max Period for Various BWs

1.0

10.0

100.0

1 10 100

Acceptance Band Upper 1/3 OB Period, sec

Ce

nts

/kW

-hr

3/3 OB

4/3 OB

5/3 OB

cost includes: Rho-Cee structure, power take-off, maintenance

70% PTO Efficiency

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Waves, Wind ± 60°

calm

calm

Extending the Wind Turbine support provided by the PSP“span”: 1040m; WT spacing: 200m (extendable-leeward); rotor diameter: 90m; ρC length: 1200m

WT rating: 3MW; ρC rating: 30kW/m; 200m dock; struts: 200m x 15’ concrete culvert pipe, w/rails

estimated total “foundation” cost: $1677/kW

Total Power Rating: 72MW WAG Total Cap Cost Est: $300M

PE Storage: ~12MW-Hr, cold

ρC / PSP

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~0.8 LMi

~1 km

A Possible Arrangement of 3 - 1km floating Rho-Cee WEC Breakwaters to

Protect the Columbia River

Bar Passage(subject to many considerations)

(Note: The scale on the chart appears bogus!)

Produced energy to pay for the project !

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