Development and Demonstration of Low Power Electrothermal De-icing System

Botura, Galdemir; Sweet, Dave; Flosdorf, David

doi:10.2514/6.2005-1460

Cited by 17 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 Among these, electro-thermal de-icing technique is considered to be the most effective and energy efficient due to its ability to control the temperature and heat dissipation by Joule heating. 16 Currently, bre reinforced polymer composites are increasingly popular in aerospace, automobile and civil engineering industries due to their higher strength and lower weight. 17 However, ice accumulation reduces the advantages that the composite brings to the structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Graphene-based surface heater for de-icing applications

et al. 2018

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graphene-based surface heater for de-icing applications

et al. 2018

View full text Add to dashboard Cite

show abstract

“…To date, a fully passive ice protection coating with application to the aviation industry does not exist. Some examples of active ice protection systems are hot-air injection, ultrasonic waves, electro-thermal heaters and pneumatic boots (Overmeyer et al, 2012;Martin and Putt, 1992;Flemming, 2003;Botura et al, 2005;Buschhorn et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Design procedures and experimental verification of an electro-thermal deicing system for wind turbines

Getz

Palacios

2021

Wind Energ. Sci.

View full text Add to dashboard Cite

Abstract. There has been a substantial growth in the wind energy power capacity worldwide, and icing difficulties have been encountered in cold climate locations. Rotor blade icing has been recognized as an issue, and solutions to mitigate accretion effects have been identified. Wind turbines are adapting helicopter rotor and propeller ice protection approaches to reduce aerodynamic performance degradation related to ice formation. 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. In this research, the design process required to develop an ice protection system for wind turbines is discussed. The design approach relies on modeling and experimental testing. Electro-thermal heater system testing was conducted at the Adverse Environment Rotor Test Stand at Penn State, where wind turbine representative airfoils protected with electro-thermal deicing were tested at representative centrifugal loads and flow speeds. The wind turbine sections tested were half-scale models of the 80 % span region of a generic 1.5 MW wind turbine blade. The icing cloud impact velocity was matched to that of a 1.5 MW wind turbine at full power production. Ice accretion modeling was performed to provide an initial estimate of the power density required to de-bond accreted ice at a set of icing conditions. Varying icing conditions were considered at −8 ∘C with liquid water contents of the cloud varying from 0.2 to 0.9 g/m3 and water droplets from 20 µm median volumetric diameter to 35 µm. Then, ice accretion thickness gradients along the span of the rotor blade for the icing conditions were collected experimentally. Given a pre-determined maximum power allocated for the deicing system, heating the entire blade was not possible. Heating zones were introduced along the span and the chord of the blade to provide the required power density needed to remove the accreted ice. The heating sequence for the zones started at the tip of the blade, to allow de-bonded ice to shed off along the span of the rotor blade. The continuity of the accreted ice along the blade span means that when using a portioned heating zone, ice could de-bond over that specific zone, but the ice formation could remain attached cohesively as it is connected to the ice on the adjacent inboard zone. To prevent such cohesive retention of de-bonded ice sections, the research determined the minimum ice thickness required to shed the accreted ice mass with the given amount of power availability. The experimentally determined minimum ice thickness for the varying types of ice accreted creates sufficient tensile forces due to centrifugal loads to break the cohesive ice forces between two adjacent heating zones. The experimental data were critical in the design of a time sequence controller that allows consecutive deicing of heating zones along the span of the wind turbine blade. Based on the experimental and modeling efforts, deicing a representative 1.5 MW wind turbine with a 100 kW power allocation required four sections along the blade span, with each heater section covering 17.8 % span and delivering a 2.48 W/in.2 (0.385 W/cm2) power density.

show abstract

“…To date, a fully passive ice protection coating with application to the aviation industry does not exist. Some examples of active ice protection systems are hot-air injection, ultrasonic waves, electro-thermal heaters and pneumatic boots (Oermeyer et al, 2012;Martin et al, 1992;Flemming, 2003;Botura et al, 2005;Buschhorn et al, 2013).…”

mentioning

confidence: 99%

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

Getz¹,

Palacios²

2020

Preprint

View full text Add to dashboard Cite

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.

show abstract

Development and Demonstration of Low Power Electrothermal De-icing System

Cited by 17 publications

References 2 publications

Graphene-based surface heater for de-icing applications

Graphene-based surface heater for de-icing applications

Design procedures and experimental verification of an electro-thermal deicing system for wind turbines

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

Contact Info

Product

Resources

About