Urban Wind Energy

Christina Beller

    Research output: Book/ReportPh.D. thesis

    4295 Downloads (Pure)

    Abstract

    New trends e.g. in architecture and urban planning are to reduce
    energy needs. Several technologies are employed to achieve this,
    and one of the technologies, not new as such, is wind energy. Wind
    turbines are installed in cities, both by companies and private
    persons on both old and new buildings. However, an overview of
    the energy content of the wind in cities and how consequently
    turbines shall be designed for such wind climates is lacking. The
    objective of the present work is to deliver an objective and
    fundamental overview of the social, practical and physical
    conditions relevant for the installation of wind turbines in cities,
    with Copenhagen, DK, as example. Focus is taken on turbine with a
    swept area of maximum 5m2, since turbines of this size are
    relatively easy to be integrated in the urban space and are in the
    financial range for small companies as well as for private persons.
    Elements important for the implementation of wind energy
    conversion systems are the macro and micro wind climate, the
    siting within a micro wind climate and the choice of a wind turbine
    model most appropriate for the selected site. In the frame of this
    work, all these important elements are analyzed and a row of
    conclusions are found. Not as a surprise, it can be concluded, that
    the average wind velocities and with that the wind energy available
    in a city is somewhat lower than at a rural site outside the city.
    Furthermore, the wind climate in cities is very dependent on the
    buildings character and higher turbulences are expected. Therefore,
    methods are developed in this work to estimate the wind energy in
    cities depending on the built-up character, with both, simple and
    advanced calculation models. The energy produced by a wind turbine is also dependent on the turbine design, but especially on
    the rotor design. An analysis of which rotor type is most effective is
    carried out. A result of this analysis is, that turbines for the
    installation in cities need to be designed very differently than e.g.
    turbines for off-shore sites and that an optimization of the design
    can increase the energy production remarkably. Despite the lower
    wind energy in cities other factors foster the attractiveness of urban
    wind energy application, like the demand or wish to reduce CO2
    emissions and the possibility to produce energy directly to ones
    household.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages168
    ISBN (Electronic)978-87-550-3953-7
    Publication statusPublished - Dec 2011
    SeriesRisø-PhD
    Number89(EN)

    Keywords

    • Risø-PhD-89(EN)
    • Risø-PhD-89

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