Energy and Economic Comparison of 4- and 5-Turbine Layouts on a Barge-Type Floating Offshore Wind Platform: Bozcaada Case Study

A. Engin Özçelik; Hamza Ozan Şirin

Energy and Economic Comparison of 4- and 5-Turbine Layouts on a Barge-Type Floating Offshore Wind Platform: Bozcaada Case Study

A. Engin Özçelik, Hamza Ozan Şirin

Abstract

Hourly wind speed data for the Bozcaada offshore region were analyzed to assess wind energy potential and to support the conceptual design of a barge-type floating offshore wind platform hosting multiple turbines. The wind climate analysis yielded a mean wind speed of 6.0065 m/s and an average wind power density of 239.18 W/m², indicating a favorable offshore resource. Statistical wind speed modeling was carried out using Rayleigh/Weibull distributions and subsequently used for turbine screening. Based on annual energy yield and capacity factor, a Vestas V90-class turbine was selected, resulting in an annual energy production of 6,694,392 kWh and a capacity factor of 0.3821 per turbine under the studied wind regime.

To evaluate array-induced performance degradation on a compact floating concept, two layouts (4-turbine and 5-turbine) were implemented on the same barge platform and analyzed via CFD to quantify wake interactions. Wake-induced velocity deficits at the rotor planes were converted to power losses using a V³ relationship and combined with the wind speed distribution to estimate net AEP at the platform level. Results indicate that, despite increased structural and operational complexity, the 5-turbine configuration provides higher net annual energy yield than the 4-turbine layout, making it a more attractive option when energy production is prioritized. The proposed workflow links site wind statistics, turbine selection, and CFD-based wake-loss estimation to support early-stage energy-centric layout decisions for floating offshore wind concepts.

Keywords

Offshore wind; Floating wind, Barge-type platform, Wind resource assessment, Weibull distribution, Wake loss, Annual energy production

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