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Thermal Characterization and Thermal Effect Assessment of Biofouling around a Dynamic Submarine Electrical Cable

Author

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  • Ziad Maksassi

    (Centre National de la Recherche Scientifique (CNRS), Laboratoire de Thermique et Énergie de Nantes (LTeN), Unité Mixte de Recherche (UMR) 6607, Nantes Université, F-44000 Nantes, France
    École Centrale Nantes, CNRS, Institut de Recherche en Génie Civil et Mécanique (GeM), UMR 618, Institut Universitaire Mer et Littoral (IUML) FR 3473, Nantes Université, F-44000 Nantes, France)

  • Bertrand Garnier

    (Centre National de la Recherche Scientifique (CNRS), Laboratoire de Thermique et Énergie de Nantes (LTeN), Unité Mixte de Recherche (UMR) 6607, Nantes Université, F-44000 Nantes, France)

  • Ahmed Ould El Moctar

    (Centre National de la Recherche Scientifique (CNRS), Laboratoire de Thermique et Énergie de Nantes (LTeN), Unité Mixte de Recherche (UMR) 6607, Nantes Université, F-44000 Nantes, France)

  • Franck Schoefs

    (École Centrale Nantes, CNRS, Institut de Recherche en Génie Civil et Mécanique (GeM), UMR 618, Institut Universitaire Mer et Littoral (IUML) FR 3473, Nantes Université, F-44000 Nantes, France)

  • Emmanuel Schaeffer

    (Institut de Recherche en Énergie Électrique de Nantes-Atlantique (IREENA), Unité de Recherche (UR) 4642, IUML FR 3473, Nantes Université, F-44600 Saint-Nazaire, France)

Abstract

Wind energy is expected to play a significant role in meeting emission targets over the next 20 years. Offshore wind turbines in deep water (>150 m) must be developed due to resource quality, environmental, and activity constraints. Floating offshore wind turbines (FOWT) will be the best technology for reaching these targets. The dynamic submarine electrical cable (DSEC) is a key component of FOWT. Its electric insulation system is intended to withstand a maximum conductor temperature of 90 °C. However, biofouling growth, particularly mussels, can modify the heat transfer around the cable and thus its maximum conductor temperature, as well as temperature fluctuation, affecting the fatigue lifetime. In our work we estimate the effective thermal conductivity of mussels of various ages, as well as the heat transfer coefficient of the water around them. The results revealed that the effective thermal conductivity of juvenile mussels is lower than that of mix (both juvenile and adult) and only adult mussels. This variation in effective thermal conductivity with mussel age is related to the water porosity of the mussel’s layer. Then, the thermal effect of the resulting global thermal resistance can lead the DSEC conductor wire to either overheat (colonized by juvenile and mixed mussels) or cool down (colonized by adult mussels). Numerical simulations are used to quantify this effect.

Suggested Citation

  • Ziad Maksassi & Bertrand Garnier & Ahmed Ould El Moctar & Franck Schoefs & Emmanuel Schaeffer, 2022. "Thermal Characterization and Thermal Effect Assessment of Biofouling around a Dynamic Submarine Electrical Cable," Energies, MDPI, vol. 15(9), pages 1-18, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3087-:d:800332
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    References listed on IDEAS

    as
    1. Victor Benifla & Frank Adam, 2022. "Development of a Genetic Algorithm Code for the Design of Cylindrical Buoyancy Bodies for Floating Offshore Wind Turbine Substructures," Energies, MDPI, vol. 15(3), pages 1-24, February.
    2. Ho-Seong Yang & Ali Alkhabbaz & Dylan Sheneth Edirisinghe & Watchara Tongphong & Young-Ho Lee, 2022. "FOWT Stability Study According to Number of Columns Considering Amount of Materials Used," Energies, MDPI, vol. 15(5), pages 1-24, February.
    3. Franck Schoefs & Thanh-Binh Tran, 2022. "Reliability Updating of Offshore Structures Subjected to Marine Growth," Energies, MDPI, vol. 15(2), pages 1-15, January.
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