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Icing in Alaska. International Wind-Diesel Workshop Mar. 11, 2011. Rich Stromberg / [email protected]. Tom Ainsworth NWS. Tom Ainsworth NWS. Tom Ainsworth NWS. Atqasuk Hoar Frost – Light Rime. - PowerPoint PPT Presentation
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Tom Ainsworth NWS
Tom Ainsw
orth NW
S
Tom
Ainsworth N
WS
Photo: R. Hafner/WCE
Atqasuk Hoar Frost – Light Rime
Photo: D. Vaught/V3
“Data recovery in Atqasuk was marginal with 63 to 73 percent data return from the anemometers and wind vane. The missing data represents the windier winter months when data recovery was extremely poor. This poor data recovery was due to soft rime ice (hoarfrost), beginning in October and lasting to early May.”
Newton Peak Rime Ice
Nome Region Wind Model – 50m AGL
Warm/moist air off the coast can cool as it rises over inland hills/mountains
Newton Peak Met Tower
Newton Peak Met Tower
Newton Peak Rime Ice
Newton Peak Rime Ice
Newton Peak Rime Ice
Newton Peak Tower Collapse
Newton Peak Rime Ice
Photo: R. Hafner/WCE
Newton Peak Rime Ice
Newton Peak Rime Ice
Photo: R. Hafner/WCE
Icing Summary• Super-cooled liquid exists in a cloud well below 0 deg
C.• Meteorological studies are essential prior to wind
development.• Presence of icing/ice-free sites is not an “either/or”
state, rather a gradient.• Find the balance between better wind regimes vs. icing
losses.• Very site specific based on terrain, predominant wind
directions and presence of moist air masses.• Some icing can impact turbine output and even affect
turbine survivability.