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1631 results in Energy Technology

Page 7 of 82

  • 4 - Support Structures for Offshore Wind Turbines

  • Finn Gunnar Nielsen, Universitetet i Bergen, Norway
  • Book:
    Offshore Wind Energy
    Published online:
    07 March 2024
    Print publication:
    14 March 2024, pp 153-167

  • Summary

    Describes the main components of an offshore wind turbine and discusses various substructures presently in use. For bottom-fixed turbines, the characteristics of monopiles, jackets, tripods and gravity-based substructures are discussed. Similarly, for floating wind turbines, the characteristics of semisubmersibles, tension-leg platforms, spar platforms and barges are discussed.

  • 7 - Floating Substructures

  • Finn Gunnar Nielsen, Universitetet i Bergen, Norway
  • Book:
    Offshore Wind Energy
    Published online:
    07 March 2024
    Print publication:
    14 March 2024, pp 213-290

  • Summary

    Introduces the concepts of hydrodynamic mass and damping, and shows how the inertia, damping and restoring matrices may be established for a six-degrees-of-freedom floating structure built from vertical columns and horizontal pontoons. Also, the computation of mass and damping matrices and wave loading general body shapes are addressed. How cancellation of wave loads may be obtained is demonstrated. The restoring effect of mooring lines is discussed, including frequency-dependent stiffness. Finally, control issues that are particular to floating wind turbines are discussed.

  • 9 - Offshore Wind Farms

  • Finn Gunnar Nielsen, Universitetet i Bergen, Norway
  • Book:
    Offshore Wind Energy
    Published online:
    07 March 2024
    Print publication:
    14 March 2024, pp 334-350

  • Summary

    Discusses issues related to offshore wind farms such as layout of the wind turbines, wind turbine wakes and wake control. The wake behind wind farms is also illustrated. Further, the concept of levelized cost of energy is introduced.

  • 8 - Marine Operations

  • Finn Gunnar Nielsen, Universitetet i Bergen, Norway
  • Book:
    Offshore Wind Energy
    Published online:
    07 March 2024
    Print publication:
    14 March 2024, pp 291-333

  • Summary

    Covers weather windows and duration statistics for marine operations as well as some issues related to multibody dynamics for lifting operations from a floating vessel. The impact load during mating operations is illustrated through an example and the statistics for impacts and snatch loads during mating operations are discussed. Mathieu instability is discussed in the context of a load hanging from a moving crane. The focus is on simple approaches to improve the understanding of the main features of the operations considered.

  • 3 - Wind Energy and Wind Loads

  • Finn Gunnar Nielsen, Universitetet i Bergen, Norway
  • Book:
    Offshore Wind Energy
    Published online:
    07 March 2024
    Print publication:
    14 March 2024, pp 77-152

  • Summary

    Covers the classical theory for conversion of wind energy into mechanical energy, including various methods for computing loads on aerofoils. These include momentum disc theory with and without rotation, lifting line and lifting surface approaches. Classical approaches for handling the unsteady effects are discussed and illustrated. Standard control approaches for fixed wind turbines operating below and above rated wind speed are discussed. The focus is on three-bladed horizontal-axis wind turbines.

  • 6 - Wave Loads on Fixed Substructures

  • Finn Gunnar Nielsen, Universitetet i Bergen, Norway
  • Book:
    Offshore Wind Energy
    Published online:
    07 March 2024
    Print publication:
    14 March 2024, pp 184-212

  • Summary

    Shows how wave loads on fixed bodies can be computed, within a linear framework as well as including viscous effects. The validity of the slender body assumption is addressed and MacCamy and Fuchs’ theory is introduced to account for diameter-to-wavelength ratios which are not very small. The concepts of modal mass and loads are introduced. Nonlinear wave loads such as ringing and slamming are discussed.

Renewable Energy Engineering
  • 2nd edition
  • Nick Jenkins, Janaka Ekanayake
  • Published online:
    08 March 2024
    Print publication:
    28 March 2024
  • Fully revised and updated, this second edition provides students with a quantitative and accessible introduction to the renewable technologies at the heart of efforts to build a sustainable future. Key features include new chapters on essential topics in energy storage, off-grid systems, microgrids and community energy; revised chapters on energy and grid fundamentals, wind energy, hydro power, photovoltaic and solar thermal energy, marine energy and bioenergy; appendices on foundational topics in electrical engineering, heat transfer and fluid dynamics; discussion of how real-world projects are developed, constructed and operated; over 60 worked examples linking theory to real-world engineering applications; and over 150 end-of-chapter homework problems, with solutions for instructors. Accompanied online at www.cambridge.org/jenkins2e by extended exercises and datasets, enabling instructors to create unique projects and coursework, this new edition remains the ideal multi-disciplinary introduction to renewable energy, for senior undergraduate and graduate students in engineering and the physical sciences.

Offshore Wind Energy
  • Environmental Conditions and Dynamics of Fixed and Floating Turbines
  • Finn Gunnar Nielsen
  • Published online:
    07 March 2024
    Print publication:
    14 March 2024
  • Many countries have plans to expand wind energy to meet CO2 emissions targets. Lack of available land area and the need for good and stable wind conditions have stimulated the development of offshore wind turbines, which allows for the development of larger turbines. The offshore environment, however, involves new challenges related to the design, installation, operation and maintenance of the turbines. Based on a graduate-level course taught by the author, this book focuses on the opportunities and challenges related to offshore wind turbines. It introduces the offshore environment, including wind and wave dynamics, before discussing the aerodynamics of wind turbines, hydrodynamic loading, marine operations, and wind farm layout. Featuring examples that demonstrate practical application of the topics covered and exercises to consolidate student understanding, this is an indispensable reference text for advanced students and researchers of environmental science and engineering and for industry professionals working in the wind energy sector.

Page 7 of 82