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VestasImpact of Serrated Trailing Edge technology Sound Power Level dB(A) Without STEs -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 -2,7 With STEs -2,6 -2,4 -1,8 -0,8 -1,1 Vestas’ Serrated Trailing Edge (STE) technology mixes the airflows, securing optimal airflow around the blade profile, resulting in a reduction of sound power level by up to 3 dB(A). Wind Speed (m/s) 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Example based on V136-3.45 MW® with 3.6 MW Power Optimised Mode. Actual performance depends on site specific conditions. Serrated Trailing Edge technology is a standard option for all Vestas 4 MW platform turbines. Advanced technology lowering base sound power levels The dominant source of sound emission by wind turbines is aerodynamic, caused by the encounter between high velocity airflow and the wind turbine, particularly, blades. Vestas reduce aerodynamic sound emission, by use of OptiTip®, aerodynamically optimised blades and proven Serrated Trailing Edge technology. Vestas OptiTip® With OptiTip®, Vestas’ pitch-regulation system, the pitch angle of the blades is continuously adjusted in accordance with changing wind conditions, ensuring the optimal angle of the blades while maintaining required sound power levels. Aerodynamic blade design Vestas manages to combine high performance and low sound power through innovative blade design. Extensive modelling and simulation are conducted to obtain critical knowledge of the sound profile of new products. By dedicating significant resources into the development of advanced aerofoil and planform designs, the blade is aerodynamically optimised for low sound power levels. Serrated Trailing Edge Technology The outer part of the blade’s trailing edge is the main driver for aerodynamic noise, created by turbulent air flows along the blade. The serrations help to mix the airflows, thereby reducing turbulence and ultimately aerodynamic noise. Since 2015, Vestas has sold more than 2,000 turbines with Serrated Trailing Edge technology, allowing an overall sound power reduction by 1-3 dB(A) without affecting the power generation. All Vestas turbines within the 2 and 4 MW platforms are available with proven Serrated Trailing Edge technology, specifically designed for the Vestas blade profile. For more information Please contact your local Vestas office for market specific availability and further information. ©Vestas 20157 This document was created by Vestas Wind Systems A/S and contains copyrighted material, trademarks and other proprietary information. All rights reserved. No part of the document may be reproduced or copied in any form or by any means such as graphic, electronic or mechanical, including photocopying, taping or information storage and retrieval systems, without the prior written permission of Vestas Wind Systems A/S. All specifications are for information only and are subject to change without notice. Vestas does not make any representations or extend any warranties, expressed or implied, as to the adequacy or accuracy of this information. Vestas Wind Systems A/S Hedeager 42 . 88220000AAaarrhhuussNN . DDeannmmaarrkk Tlf.:: ++44559977330000000000 . FFaaxx:: ++44559977330000000011 vestas@vestas.com . vestas.com 07/2017– ENPage 1