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. Within this work, an existing model of a Suzlon S111 2.1 MW turbine is usedto estimate potential cost savings when the conventional upwind rotor conceptis changed into a downwind rotor concept. A design framework is used to getrealistic design updates for the upwind configuration, as well as two designupdates for the downwind configuration, including a pure material cost out ofthe rotor blades and a new planform design. A full design load basis accordingto the standard has been used to evaluate the impact of the redesigns on theloads. A detailed cost model with load scaling is used to estimate the impactof the design changes on the turbine costs and the cost of energy. It is shownthat generally lower blade mass of up to 5 % less than the upwind redesign can be achieved with the downwindconfigurations. Comparedto an upwind baseline, the upwind redesign shows an estimated cost of energyreduction of 2.3 %, and the downwind designs achieve a maximumreduction of 1.3 %.

Redesign of an upwind rotor for a downwind configuration: design changes and cost evaluation