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Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator

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  • Ahmad Fazlizan

    (Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia)

  • Wen Tong Chong

    (Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia)

  • Sook Yee Yip

    (UM Power Energy Dedicated Advanced Centre, University of Malaya, Level 4, Wisma R&D, Jalan Pantai Baharu, 59990 Kuala Lumpur, Malaysia)

  • Wooi Ping Hew

    (UM Power Energy Dedicated Advanced Centre, University of Malaya, Level 4, Wisma R&D, Jalan Pantai Baharu, 59990 Kuala Lumpur, Malaysia)

  • Sin Chew Poh

    (Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia)

Abstract

A vertical axis wind turbine (VAWT) was positioned at the discharge outlet of a cooling tower electricity generator. To avoid a negative impact on the performance of the cooling tower and to optimize the turbine performance, the determination of the VAWT position in the discharge wind stream was conducted by experiment. The preferable VAWT position is where the higher wind velocity matches the positive torque area of the turbine rotation. With the proper matching among the VAWT configurations (blade number, airfoil type, operating tip-speed-ratio, etc. ) and exhaust air profile, the turbine system was not only able to recover the wasted kinetic energy, it also reduced the fan motor power consumption by 4.5% and increased the cooling tower intake air flow-rate by 11%. The VAWT had a free running rotational speed of 479 rpm, power coefficient of 10.6%, and tip-speed-ratio of 1.88. The double multiple stream tube theory was used to explain the VAWT behavior in the non-uniform wind stream. For the actual size of a cooling tower with a 2.4 m outlet diameter and powered by a 7.5 kW fan motor, it was estimated that a system with two VAWTs (side-by-side) can generate 1 kW of power which is equivalent to 13% of energy recovery.

Suggested Citation

  • Ahmad Fazlizan & Wen Tong Chong & Sook Yee Yip & Wooi Ping Hew & Sin Chew Poh, 2015. "Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator," Energies, MDPI, vol. 8(7), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:7:p:6566-6584:d:51864
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    References listed on IDEAS

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    Cited by:

    1. Singh, Enderaaj & Roy, Sukanta & Yam, Ke San & Law, Ming Chiat, 2023. "Numerical analysis of H-Darrieus vertical axis wind turbines with varying aspect ratios for exhaust energy extractions," Energy, Elsevier, vol. 277(C).
    2. Chong, Wen-Tong & Muzammil, Wan Khairul & Ong, Hwai-Chyuan & Sopian, Kamaruzzaman & Gwani, Mohammed & Fazlizan, Ahmad & Poh, Sin-Chew, 2019. "Performance analysis of the deflector integrated cross axis wind turbine," Renewable Energy, Elsevier, vol. 138(C), pages 675-690.
    3. Seyedsaeed Tabatabaeikia & Nik Nazri Bin Nik-Ghazali & Wen Tong Chong & Behzad Shahizare & Ahmad Fazlizan & Alireza Esmaeilzadeh & Nima Izadyar, 2016. "A Comparative Computational Fluid Dynamics Study on an Innovative Exhaust Air Energy Recovery Wind Turbine Generator," Energies, MDPI, vol. 9(5), pages 1-19, May.
    4. Chong, Wen-Tong & Muzammil, Wan Khairul & Wong, Kok-Hoe & Wang, Chin-Tsan & Gwani, Mohammed & Chu, Yung-Jeh & Poh, Sin-Chew, 2017. "Cross axis wind turbine: Pushing the limit of wind turbine technology with complementary design," Applied Energy, Elsevier, vol. 207(C), pages 78-95.

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