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Studying Four Different Permanent Magnet Eddy Currents Heaters with Different Magnet Areas and Numbers to Produce Heat Directly from a Vertical Axis Wind Turbine

Author

Listed:
  • Ali Khanjari

    (Department of Mechanical Engineering, Kunsan National University, Gunsan 54150, Korea)

  • Sangkyun Kang

    (Department of Mechanical Engineering, Kunsan National University, Gunsan 54150, Korea)

  • Daeyong Lee

    (Institute of Offshore Wind Energy, Kunsan National University, Gunsan 54150, Korea)

  • Dae-Yi Jung

    (School of Mechanical System Engineering, Kunsan National University, Gunsan 54150, Korea)

  • Jang-Ho Lee

    (School of Mechanical System Engineering, Kunsan National University, Gunsan 54150, Korea)

Abstract

Changing the magnetic field on a conductor metal can induce eddy currents, which cause heat generation. In this paper, we use this idea to convert wind energy into thermal energy directly. This system contains a vertical axis wind turbine and an eddy currents heat generator. The eddy currents heat generator has two parts. The first part is a rotor with some permanent magnets causing the magnetic field changes, and the second part is a stator that acts as a conductor. The magnetic field changes in the heat generator play an important role in power output; therefore, we test four different magnet arrangements with different pole numbers on the rotor at different rotational speeds from 100 rpm to 500 rpm to measure the input torque and power needed to rotate each model. Then, based on the measured data, the wind turbine is designed by Qblade software based on the blade element momentum theory. It is shown that compared to the weight of the heat generator and the area of magnetization, designing a proper magnet arrangement for the heat generator can change the output power considerably as it can trigger the magnetic field fluctuation along the direction of rotation. For example, opting for a proper arrangement on the rotor decreases the number of poles from 120 to 24 but increases the power input from 223 W to 1357 W.

Suggested Citation

  • Ali Khanjari & Sangkyun Kang & Daeyong Lee & Dae-Yi Jung & Jang-Ho Lee, 2021. "Studying Four Different Permanent Magnet Eddy Currents Heaters with Different Magnet Areas and Numbers to Produce Heat Directly from a Vertical Axis Wind Turbine," Energies, MDPI, vol. 15(1), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:15:y:2021:i:1:p:275-:d:715798
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    References listed on IDEAS

    as
    1. Khanjari, Ali & Mahmoodi, Esmail & Ahmadi, Mohammad Hossien, 2020. "Energy and exergy analyzing of a wind turbine in free stream and wind tunnel in CFD domain based on actuator disc technique," Renewable Energy, Elsevier, vol. 160(C), pages 231-249.
    2. Pinilla, Manuel & Martinez, Sergio, 2012. "Optimal design of permanent-magnet direct-drive generator for wind energy considering the cost uncertainty in raw materials," Renewable Energy, Elsevier, vol. 41(C), pages 267-276.
    3. Shi, Ningqiang & Wei, Min & Zhang, Lixin & Hu, Xue & Song, Bao, 2021. "Design and research of cooling system for 2.5 MW permanent magnet wind turbine," Renewable Energy, Elsevier, vol. 168(C), pages 97-106.
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