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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2020-68
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-68
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  15 Jun 2020

15 Jun 2020

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This preprint is currently under review for the journal WES.

Design Procedures and Experimental Verification of an Electro-Thermal De-Icing System for Wind Turbines

David Getz1 and Jose Palacios2 David Getz and Jose Palacios
  • 1Department of Aerospace Engineering, 207 Unit C Building, Pennsylvania State University, University Park, Pennsylvania 16802
  • 2Department of Aerospace Engineering, 229 Hammond Building, Pennsylvania State University, University Park, Pennsylvania 16802

Abstract. Electro-thermal heating is one of the main technologies used to protect rotors from ice accretion and it is one of the main technologies being considered to protect wind turbines. The design process required to develop an ice protection system for wind turbines is detailed. Three icing conditions were considered: Light, Medium and Severe. Light icing conditions were created using clouds at −8 °C with a 0.2 g/m3 liquid water content (LWC) and water droplets of 20 µm median volumetric diameter (MVD). Medium icing condition clouds had a LWC of 0.4 g/m3 and 20 μm MVD, also at −8 °C. Severe icing conditions had an LWC of 0.9 g/m3 and 35 μm MVD at −8 °C. Wind turbine representative airfoils protected with electro-thermal de-icing were modeled and tested at representative centrifugal loads and flow speeds. The wind turbine sections used were 1/2 scale models of the 80 % span region of a generic 1.5 MW wind turbine blade. Based on experimental and modeling efforts, de-icing a representative 1.5 MW wind turbine with a 100 kW power allocation required four sections along the span, with each heater section covering 17.8 % span and delivering a 2.48 W/in2 (0.385 W/cm2) power density. The time sequences for the controller required approximately 10 minutes for each cycle.

David Getz and Jose Palacios

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David Getz and Jose Palacios

David Getz and Jose Palacios

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Latest update: 13 Aug 2020
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Short summary
A methodology to design electrothermal de-icing protection for wind turbines is presented. The method relies in modeling and experimental testing to determine the critical ice thickness. The critical ice thickness needed is dependent on the ice tensile strength which varies with icing conditions. The ice tensile strength must be overcome by the stress that a debonded ice structure exerts under centrifugal force at its root region, where it attaches to a non-debonded ice region.
A methodology to design electrothermal de-icing protection for wind turbines is presented. The...
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