HomeMy WebLinkAboutChignik Lake Met Tower Report - Mar 2011 - REF Grant 2195374
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Chignik Lake Wind Resource Summary Report
Rich Stromberg
Alaska Energy Authority, Alternative Energy and Energy Efficiency Group
All information contained herein is public domain.
OVERVIEW
A 17-month wind study was conducted southwest of town in 2009-11 under funding from Round 1 of the Renewable Energy Fund
(grant 2195374). Chignik Lake has good wind energy potential, but multiple major barriers to that preclude further project
development.
DATA SUMMARY
Average Wind Speed @ 30 m:6.266 m/s
Average Power Density @ 50 m:477 W/m^2
Average Power Density @ 30 m:404 W/m^2
Air Density:1.039 kg/m^3
Weibull k:1.54
Shear Factor:0.092 Low shear
Roughness Class:0.160
Turbulence Intensity @ 15 m/s:0.186 Max allowable is .180
IEC Turbine Class:III-A Exceeds IEC class due to turbulence.
Wind Class @ 30 m:4
Associated CF:24.0%
Predicted CF:28.1%
Comments
AEA Wind Data ()
Chignik Lake Wind Analysis
Application/Grant #
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Average winds are good at 6.26 meters per
second. Minimal level of icing seen during winter months. Low wind shear (good).
Low extreme wind estimates. Estimated net capacity factor for a 100kW wind
turbine is 28.1% (good). Energy-producing winds are generally out of the west.
Diurnal pattern indicates stronger afternoon winds driven by surface heating. Winds
are strongest in the winter months and calmest in the summer months.
Unfortunately, the turbulence intensity exceeds allowable limits for wind turbine
manufacturers according to IEC standards.
WIND TURBINE SITING CONSIDERATIONS
The village is east of the east-west runway. All potential wind turbine sites are inside approach and
take off pattern. Community is within .8 km of wind turbine site with some shadow flicker
expected. Layout of town site versus land/lake doesn’t allow for a turbine on the north side of the
town.
FAA
Distance to airport 2200 Feet
Airport elev 52 Feet
Turbine elevation 97 Feet
Turbine hub height 37 Meters
Turbine rotor dia.54 Meters
Turbine height 209.9712 Feet
Slope ratio X:1 8.628425 20 min.
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INTEGRATED POWER SYSTEM CONSIDERATIONS
Average village electrical load of 44 kW is well below minimum load for viable wind turbine and diesel generator configuratio n. This
is further reflected in the average diesel efficiency of 10.38 kWh per gallon versus a desired level o f 12-14 or higher.
BARRIERS
Turbulence intensity is too high at the met tower site and exceeds allowable levels required by wind turbine manufacturers.
Average village electrical load of 44 kW is well below minimum load for viable wind turbine and diesel generator
configuration.
FAA requirements versus available, developable sites prohibit any viable wind turbine locations.
CONCLUSIONS
While there is reasonable energy potential in the wind resource, the high turbulence at the site, alternate siting limit ations due to the
airport and landforms, plus the low electrical load in the community prevent the development of a reliable and economic wind -diesel
system with currently available technology.
CONTACT INFORMATION
Rich Stromberg, Wind Program Manager, Alaska Energy Authority rstromberg@aidea.org 907-771-3053
ACKNOWLEDGMENTS
Original met tower data collection by Knight -Piesold.