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Steady-state analysis of a conceptual offshore wind turbine driven electricity and thermocline energy extraction plant

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  • Buhagiar, Daniel
  • Sant, Tonio

Abstract

A system for using offshore wind energy to generate electricity and simultaneously extract thermal energy is proposed. This concept is based on an offshore wind turbine driven hydraulic pump supplying deep seawater under high pressure to a land based plant consisting of a hydroelectric power generation unit and heat exchanger. A steady-state system model is developed using empirical formulae. The mathematical model comprises the fundamental system sub-models that are categorised as the rotor, hydraulic pump, pipeline, hydroelectric turbine and heat exchanger. A means for modelling the seawater temperature field across a two-dimensional bathymetry is also discussed. These mathematical models are integrated into a computational tool and a brief parametric static analysis is undertaken. The results illustrate the effect of pipeline diameter, rotational speed of the grid connected hydroelectric turbine, and the turbine distance from shore on the overall performance of the system. Through adequate parameter selection, the total rate of energy output for such a system, consisting of both electricity and thermal energy, is shown to increase by as much as 84%, when compared to a conventional wind turbine having an identical rotor diameter but which supplies only electrical energy.

Suggested Citation

  • Buhagiar, Daniel & Sant, Tonio, 2014. "Steady-state analysis of a conceptual offshore wind turbine driven electricity and thermocline energy extraction plant," Renewable Energy, Elsevier, vol. 68(C), pages 853-867.
    • Handle: RePEc:eee:renene:v:68:y:2014:i:c:p:853-867
    DOI: 10.1016/j.renene.2014.02.043
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    References listed on IDEAS

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    1. Christopher Schmitz, 1986. "The Rise of Big Business in the World Copper Industry 1870-1930," Economic History Review, Economic History Society, vol. 39(3), pages 392-410, August.
    2. Hamidat, A. & Benyoucef, B., 2008. "Mathematic models of photovoltaic motor-pump systems," Renewable Energy, Elsevier, vol. 33(5), pages 933-942.
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    Cited by:

    1. Tao, Jing & Wang, Huaiyu & Liao, Haohan & Yu, Suiran, 2019. "Mechanical design and numerical simulation of digital-displacement radial piston pump for multi-megawatt wind turbine drivetrain," Renewable Energy, Elsevier, vol. 143(C), pages 995-1009.
    2. Fan, YaJun & Mu, AnLe & Ma, Tao, 2016. "Modeling and control of a hybrid wind-tidal turbine with hydraulic accumulator," Energy, Elsevier, vol. 112(C), pages 188-199.
    3. Galea, Matthew & Sant, Tonio, 2016. "Coupling of an offshore wind-driven deep sea water pump to an air cycle machine for large-scale cooling applications," Renewable Energy, Elsevier, vol. 88(C), pages 288-306.
    4. Buhagiar, Daniel & Sant, Tonio & Micallef, Christopher & Farrugia, Robert N., 2015. "Improving the energy yield from an open loop hydraulic offshore turbine through deep sea water extraction and alternative control schemes," Energy, Elsevier, vol. 84(C), pages 344-356.

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