Ice extraction from wind turbine using flow of hot air through blade
01 Aug 2017-
TL;DR: In this paper, the ice accumulated on the wind turbine blade is removed by passing hot air through the blade, the ice melts and falls down, and the process of deicing is fast.
Abstract: In this paper high the ice accumulated on the wind turbine blade is removed by passing hot air through the blade. The hollow tubes are embedded in the wind turbine blades. The hollow tubes may be circular on cross section or of any suitable shape. The air is heated by an electrical heating or by gas geyser. First the air is compressed with help of a compressor. Then that air is passed through the electric heater or gas heater. The hot air is then passed through the wind turbine blade. When the hot air is passed through the wind turbine blade, the ice melts and falls down. Hot air is passed through the wind turbine blade after frequent intervals of time when the environmental conditions are favorable for icing. The process of deicing is fast.
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TL;DR: In this article , the authors presented a smart, hybrid (passive and active) de-icing system through the combination of a low interfacial toughness coating, printed circuit board heaters, and an ice-detecting microwave sensor.
Abstract: Abstract Ice accretion causes problems in vital industries and has been addressed over the past decades with either passive or active de-icing systems. This work presents a smart, hybrid (passive and active) de-icing system through the combination of a low interfacial toughness coating, printed circuit board heaters, and an ice-detecting microwave sensor. The coating’s interfacial toughness with ice is found to be temperature dependent and can be modulated using the embedded heaters. Accordingly, de-icing is realized without melting the interface. The synergistic combination of the low interfacial toughness coating and periodic heaters results in a greater de-icing power density than a full-coverage heater system. The hybrid de-icing system also shows durability towards repeated icing/de-icing, mechanical abrasion, outdoor exposure, and chemical contamination. A non-contact planar microwave resonator sensor is additionally designed and implemented to precisely detect the presence or absence of water or ice on the surface while operating beneath the coating, further enhancing the system’s energy efficiency. Scalability of the smart coating is demonstrated using large (up to 1 m) iced interfaces. Overall, the smart hybrid system designed here offers a paradigm shift in de-icing that can efficiently render a surface ice-free without the need for energetically expensive interface melting.
13 citations
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References
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01 Oct 2016
TL;DR: The problem of icing detection is considered for wind turbines operating in medium speed wind region (Region 2) and subject to a control law tracking the Maximum Delivery Point of the power coefficient characteristic based on an observer of the rotor angular acceleration.
Abstract: In this paper the problem of icing detection is considered for wind turbines operating in medium speed wind region (Region 2) and subject to a control law tracking the Maximum Delivery Point of the power coefficient characteristic. Based on an observer of the rotor angular acceleration, rotor inertia is estimated in order to detect its eventual increase due to icing. Moreover, the observed value of rotor inertia can be potentially used for updating the controller parameters or to stop the turbine when icing is too severe. The proposed approach has been tested by intensive MatLab® simulations using the NREL 5 MW wind turbine model.
15 citations
06 Jul 2016
TL;DR: The development of a numerical approach for the computational implementation of closed-loop active de-icing using distributed resistive heating and temperature sensing and the optimization tool in ANSYS is used for calculation of the optimal values of controller parameters.
Abstract: This paper explains the development of a numerical approach for the computational implementation of closed-loop active de-icing using distributed resistive heating and temperature sensing. The optimization tool in ANSYS is used for calculation of the optimal values of controller parameters. The results are presented for a continuous proportional controller and a pulsed proportional controller on a segment of a rotating 1.5 MW wind turbine blade. The results show that despite the simplicity of the controller scheme, its de-icing time is about 4 times faster than a constant heat flux thermal actuation with the same amount of total energy consumption while significantly reducing the maximum applied temperature to the blade structure. The results show that larger controller gains need to be selected for those heaters that are closer to the blade leading edge due to the larger amount of convective heat loss in that region.
15 citations
03 May 2016
TL;DR: In this paper, an experimental investigation of the aerodynamic changes occur due to effect of ice accumulated on the rotor blades of wind turbine is carried out and the results show that the rotor blade with lead and trail edge ice has reduced peak value but shape of the Cp curve is unchanged as compared to clean and lead edge ice blade.
Abstract: Wind Turbine is highly nonlinear plant whose dynamics changes with change in aerodynamics of the rotor blade. Power extracted from the wind turbine is a function of coefficient of power (Cp). Wind turbine installed in the cold climate areas has an icing on its rotor blade which might change its aerodynamics. This paper is an experimental investigation of the aerodynamic changes occur due to effect of ice accumulated on the rotor blades of wind turbine. We have tested three small scale model of the NREL's 5MW rotor blade with same profile but simulated different icing effect on them. These models are printed with 3D printer and tested one by one in a Wind Tunnel. Lift, drag and moment coefficients are calculated from the measured experimental data and program WT-Perf based on blade-element momentum (BEM) theory is used to predict the performance of wind turbine. Cp curves generated from the test are compared with each other to see the effect of icing effect however Cp curve of the clean blade generated from the experiment is compared with the Cp curve from the NREL's 5MW rotor blade airfoil to see the effect of the limitation of the project. It is clear from the results that the rotor blade with lead edge ice has less peak value and shape of the Cp curve is unchanged as compared to clean blade. However the blade with lead and trail edge ice has reduced peak value but shape of the Cp curve is changed as compared to clean and lead edge ice blade.
13 citations
"Ice extraction from wind turbine us..." refers background or methods in this paper
...Similarly he conducted the experiment for leading edge ice model as well as lead and trailing edge ice model.[13]...
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...For the blade with icing on leading and trailing edge, the coefficient of power has also small peak value.[13] The shape of the coefficient of power curve is changed for wind turbine blade with icing on leading and trailing edge....
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...[13] The density of glaze type of icing is 900 kg / m3....
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...[12] Raja M Imran [13] studied the impact of icing on the blades of the wind turbine rotor....
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21 Dec 2015
TL;DR: In this paper, a site survey is done for four sites in Pune India and the electrical power is predicted for each site for different tower heights of the wind turbine for different lengths of blades of turbine.
Abstract: In this paper the site survey is done for four sites in Pune India. The electrical power is predicted for each site for different tower heights of the wind turbine. Different lengths of blades of turbine are also considered for power prediction. This method involves site survey using anemometers. This method involves low cost and less manpower.
12 citations