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Evaluation of the Hot Air Recirculation Effect and Relevant Empirical Formulae Applicability for Mechanical Draft Wet Cooling Towers

Author

Listed:
  • Haotian Dong

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China
    These authors contributed equally to this work and should be considered co-first authors.)

  • Dawei Wan

    (Shanghai Electric Power Station Engineering Co., Ltd., Shanghai 200000, China
    Shanghai Environmental Protection Complete Engineering Co., Ltd., Shanghai 200070, China
    These authors contributed equally to this work and should be considered co-first authors.)

  • Minghua Liu

    (Shanghai Electric Power Station Engineering Co., Ltd., Shanghai 200000, China)

  • Tiefeng Chen

    (Guodian Zheneng Ningdong Power Generation Co., Ltd., Yinchuan 750408, China)

  • Shasha Gao

    (Jinan Lanchen Energy Technology Corporation Ltd., Jinan 250100, China)

  • Yuanbin Zhao

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

Abstract

Due to the hot air recirculation, the inlet air enthalpy h1 of mechanical draft wet cooling towers (MCTs) was usually greater than the ambient air enthalpy ha. To realize the cooling performance and accurate design of MCTs, this paper clarified the feasibility of the inlet air enthalpy empirical formula presented by the Cooling Technology Institute (CTI) of the USA. A three-dimensional (3D) numerical model was established for a representative power plant, with full consideration of MCTs and adjacent main workshops, which were validated by design data and published test results. By numerical simulation, the influence of different wind directions and wind speeds on hot air recirculation (HAR) and the influence of HAR on the cooling performance of the MCTs were qualitatively studied based on the concept of hot air recirculation rate (HRR), and the correction value of HRR was compared with the calculated value of the CTI standard. The evaluation coefficient η h , representing the ratio of the corrected value to the calculated value was introduced to evaluate the applicability of the CTI formula. It was found that HAR was more sensitive to ambient crosswind, and an increase in HRR would deteriorate the tower cooling performance. When the crosswind speed increased from 0 to 15 m/s, η h , changed from 2.42 to 80.18, and the calculation error increased accordingly. It can be concluded that the CTI empirical HRR formula should be corrected when there are large buildings around the MCTs, especially under high-speed ambient crosswind conditions.

Suggested Citation

  • Haotian Dong & Dawei Wan & Minghua Liu & Tiefeng Chen & Shasha Gao & Yuanbin Zhao, 2020. "Evaluation of the Hot Air Recirculation Effect and Relevant Empirical Formulae Applicability for Mechanical Draft Wet Cooling Towers," Energies, MDPI, vol. 13(13), pages 1-20, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:13:p:3347-:d:378736
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    References listed on IDEAS

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    1. Yang, L.J. & Wang, M.H. & Du, X.Z. & Yang, Y.P., 2012. "Trapezoidal array of air-cooled condensers to restrain the adverse impacts of ambient winds in a power plant," Applied Energy, Elsevier, vol. 99(C), pages 402-413.
    2. Jun Fan & Haotian Dong & Xiangyang Xu & De Teng & Bo Yan & Yuanbin Zhao, 2019. "Numerical Investigation on the Influence of Mechanical Draft Wet-Cooling Towers on the Cooling Performance of Air-Cooled Condenser with Complex Building Environment," Energies, MDPI, vol. 12(23), pages 1-16, November.
    3. Zhao, Yuanbin & Sun, Fengzhong & Li, Yan & Long, Guoqing & Yang, Zhi, 2015. "Numerical study on the cooling performance of natural draft dry cooling tower with vertical delta radiators under constant heat load," Applied Energy, Elsevier, vol. 149(C), pages 225-237.
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    1. Weipeng Deng & Fengzhong Sun, 2021. "Comparative Study on the Cooling Characteristics of Different Fill Layout Patterns on a Single Air Inlet Induced Draft Cooling Tower," Energies, MDPI, vol. 14(19), pages 1-17, October.

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