petd wind blade de-icing
DESCRIPTION
Ø Wind Blades: Icing represents an estimated 10% loss of power generation in cold climates. In a PETD equipped wind turbine will never have to be shut down due to icing. A large wind turbine that costs $5mm to build generates an average of $750,000/year in power at wholesale prices. With even a 5% loss, PETD-enabled Wind Blades recover $33,000/year worth of energy. Furthermore, PETD technology dramatically expands the geography (e.g. ocean) suitable for wind farms. No other technology has been successfully tested for this application. GE Ecomagination Innovation AwardTRANSCRIPT
SPECIAL NOTE: Nov 16, 2010 PolarStar (formerly IceCode) was chosen from among 3800 entries as one of five innovation award winners of the ‘GE ecomagination Challenge: Powering the Grid’
52 Patents 116 Pending ...Worldwide
Contact: Cliff Lyon 801.274.0882
M.S., Moscow Institute of Physics and TechnologyPh.D., U.S.S.R. Academy of Science, Moscow 1974D.Sc., Physics and Mathematics, U.S.S.R. Academy of Science, Chernogolovka 1983
Publishing:Physics of IcePhysics of SemiconductorsOver 150 scientific publications
A team of physicists and engineers at Dartmouth College led by Dr. Victor Petrenko have unlocked the secrets of ice and perfected a number of ways to make ice work for us instead of against us.
(See video interview)
Dr. Victor F. PetrenkoDirector, Ice Physics Research LabThayer School of EngineeringDartmouth College, Hanover, NH USA54 patents, 116 pending worldwide
Photo Courtesy of Gary Braasch. All Rights Reserved
ICECODEAt POLARSTAR, we have deciphered the secrets, decoded the details and changed man’s interface with ice forever.
www.polar-star.us
A team of physicists and engineers at Dartmouth College led by Dr. Victor Petrenko have unlocked the secrets of ice and perfected a number of ways to make ice work for us instead of against us.
click to play video
More videos here
PETD technology breaks the ice bond almost instantaneously, inexpensively and with dramatically less energy than current technology.
We Cracked It
Where can we break ice?
● Ice makers ● Power lines● Windshields ● Wings and wind blades● Bridges, buildings and ships● Refrigerators and air-conditioning
...and more
Premise Power Grid
POLARSTAR VRC technology melts ice from power transmission lines without service interruption. There is no other known solution.
Today, the US power grid is over-capacity causing massive loss of heat energy. VRC means higher capacity lines can be employed improving transmission efficiency by up to 25% for over 50% of the grid worldwide.
(VRC Technical Paper) (Patent)Full VRC presentation
Premise Wind blades
World wide, lost power production due to wind blade icing averages 10% in cold climates.
PETD-enabled wind blades eliminatewind turbine down-time due to icing
SPECIAL NOTE: On November 16, 2010 PolarStar was named one of five innovation award winners of the ‘GE ecomagination Challenge: Powering the Grid.’
Click for video
PETD-I
PETD concentrates a “smart,” precise, high power pulse to the ice/substrate interface for between .01 - 4 seconds to heat a minimal layer of interfacial ice to just above the melting point causing the ice to slide off a resulting thin water film. Watch demonstration video
"An ice surface has a high electric charge. Ice doesn't simply cake onto surfaces, it bonds in three ways: via the hydrogen atoms themselves, via an electrostatic bond caused by the current and via comparatively weak van der Waals forces.
There is no surface coating which can suspend those three forces. That is why the search for ice-phobic coatings has failed. POLARCSTAR PETD melts just a few microns of the ice interface and gravity does the rest." - Dr. Victor Petrenko
SPECIAL NOTE: On Nov 16, 2010 PolarStar was named one of five innovation award winners of the ‘GE ecomagination Challenge: Powering the Grid.’ For PETD technology.
Pulse Electro-Thermal Deicing (PETD) (technical paper)
Wind Turbines I
POLARSTAR Wind Blade De-icing Technology Full power production in the most severe icing conditions. Allows for wind farms in high wind locations heretofore disqualified due to icing.
● Instant de-icing & anti-Icing● Low power requirements ● Lightning strike protection ● Flexible control electronics● Patented worldwide
SPECIAL NOTE: On Nov 16, 2010 PolarStar was named one of five innovation award winners of the ‘GE ecomagination Challenge: Powering the Grid.’ For PETD technology.
Wind Blades Winter
Note: Population data is taken from 2009 U.N. statistics.Note: Population percentages affected by winter conditions are estimated.
RegionTotal
Population (M)
% Affected by Winter ConditionsU.S.
307 63%Canada
34 100%Western Europe
188 100%Eastern Europe
293 100%Northern Europe
98 100%Japan
127 58%Russia
150 86%China
1,350 75%South Korea
48 100%
Global Population and Winter Conditionsin Select Regions
Once wind turbine blades begin to accumulate ice, like airplane wings, they lose lift and slow down until finally, to avoid damage, they must be shut down until the ice melts.
Blades Retro Fit Diagram
Proprietary Mathcad/COMSOL software tools are used to design and model tile size, shape placement and pulse delivery. Intelligent multiple tile design:
○ Provides incremental de-icing pulse delivery system balanced with power availability.
○ Allows for blade flex and perfect conformance to airfoil shape.
○ Matches coefficients of thermal expansion of tile and blade materials to minimize thermally induced stress.
Adhesion: The preferred laminate has excellent adhesive quality. Fasteners may be used.
Wind Blades Retro Fit
Proprietary PETD Tiles Material: The optimal tile material is a thin composite laminate (.25 to .5mm thick) Application: 3 to 5 ft2 tiles are laid in a series along the leading edge of the air foil. A bank of ultra capacitors Maxwell or Nesscap provide power to the tiles. Life expectancy: Where the maximum imaginable heating cycles is 10,000 per year, the life expectancy the PETD material components is at least 50 years.
Wind Blades Detail
Low Power Consumption A 1-2 second 50kW/m2 pulse (average) is required per heating cycle. Under the most serious icing conditions, a heating cycle every 10 minutes uses in average power density of 83W/m2 to 167W/m2.
167W/m2 x 150m2 = 25kW Example: The target area of a 50m blades is about 150m2. Under heavy icing conditions such a turbine would use an average of less than 25kW.
Blades Retro Fit Diagram
System Overview For most existing sites, only the outer third of the blade requires ice protection tiles.
Integrated Design Variables
Integrated Design Variables: Ocean: Blade length, speed and distance to ocean surface (spray). Land: Altitude (air density) and moisture
Meteorological parameters: (NASA's LEWICE Ice modeling software for predicting icing conditions in aerospace works well for wind turbines)
Wind blades can be POLARSTAR-Enabled in manufacturing
In over a decade of research, development and extensive testing of PETD technology in aerospace the Petrenko research team has created a powerful set of software tools to model PETD. These tools provide the ability to design PETD applications quickly and with a high degree of confidence, for hundreds of different materials, blade shapes and environmental conditions.
Other Attempts Blade De-Icing
Why Other Solutions Don't Work
Thermal Heating panels/tape● Too slow. Heat dissipates into ice and
blade● Incomplete de-icing ● Patches fall off due to thermal expansion,
material incompatibility● Excessive power consumption
Hot Air Blade Heating● Requires plant shut down ● Incomplete de-icing ● Too slow. Heat dissipates into ice and
blade● Excessive power consumption
Ice-phobic coatings
● Years of testing has not yielded success● Icing occurred even on coated surfaces● Materials degradation, coating becomes
porous
Last Slide of 7 (short presentation)
Click for full presentation (PPT slide deck)
Contact: Cliff Lyon 801.274.0882