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Optimization of reversibly used cooling tower with downward spraying

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  • Cui, Haijiao
  • Li, Nianping
  • Wang, Xinlei
  • Peng, Jinqing
  • Li, Yuan
  • Wu, Zhibin

Abstract

Heat pumps associated with reversibly used cooling towers present great potential for energy saving in subtropical areas. To study the heat and mass transfer characteristics of reversibly used cooling towers with downward spraying (DSRUCT) and optimize its thermal performance, a mathematical model was developed and validated through field experiments. Then a parametric study was conducted to study the impacts of initial solution temperature (−4 to −1 °C), gas velocity (2.5–4 m/s), initial droplet velocity (4–10 m/s) and droplet diameter (0.65–1.2 mm) on the heat rate, tower effectiveness and solution temperature distribution. According to the results of the parametric study, we proposed an optimization method established on the concepts of critical gas velocity and critical height. This method was based on multivariable analysis. Two operating parameters (gas velocity and droplet diameter) and one structural parameter (tower height) were simultaneously concerned. The results of this work provided a theoretical foundation for optimizing the thermal performance and saving initial investment of DSRUCT and other counter-current spray systems, e.g., dehumidification, desulfurization, spray cooling, and carbon capture.

Suggested Citation

  • Cui, Haijiao & Li, Nianping & Wang, Xinlei & Peng, Jinqing & Li, Yuan & Wu, Zhibin, 2017. "Optimization of reversibly used cooling tower with downward spraying," Energy, Elsevier, vol. 127(C), pages 30-43.
    • Handle: RePEc:eee:energy:v:127:y:2017:i:c:p:30-43
    DOI: 10.1016/j.energy.2017.03.074
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    References listed on IDEAS

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    Cited by:

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    2. Ayoub, Ali & Gjorgiev, Blaže & Sansavini, Giovanni, 2018. "Cooling towers performance in a changing climate: Techno-economic modeling and design optimization," Energy, Elsevier, vol. 160(C), pages 1133-1143.
    3. Men, Yiyu & Liu, Xiaohua & Zhang, Tao, 2020. "Analytical solutions of heat and mass transfer process in combined gas-water heat exchanger applied for waste heat recovery," Energy, Elsevier, vol. 206(C).
    4. Li, Hailong & Wang, Bin & Yan, Jinying & Salman, Chaudhary Awais & Thorin, Eva & Schwede, Sebastian, 2019. "Performance of flue gas quench and its influence on biomass fueled CHP," Energy, Elsevier, vol. 180(C), pages 934-945.
    5. Su, Wei & Lu, Zhifei & She, Xiaohui & Zhou, Junming & Wang, Feng & Sun, Bo & Zhang, Xiaosong, 2022. "Liquid desiccant regeneration for advanced air conditioning: A comprehensive review on desiccant materials, regenerators, systems and improvement technologies," Applied Energy, Elsevier, vol. 308(C).
    6. Yifei Lv & Jun Lu & Yongcai Li & Ling Xie & Lulu Yang & Linlin Yuan, 2020. "Comparative Study of the Heat and Mass Transfer Characteristics between Counter-Flow and Cross-Flow Heat Source Towers," Energies, MDPI, vol. 13(11), pages 1-29, May.
    7. Cui, Haijiao & Li, Nianping & Peng, Jinqing & Yin, Rongxin & Li, Jingming & Wu, Zhibin, 2018. "Investigation on the thermal performance of a novel spray tower with upward spraying and downward gas flow," Applied Energy, Elsevier, vol. 231(C), pages 12-21.
    8. Ma, Jiaze & Wang, Yufei & Feng, Xiao, 2017. "Energy recovery in cooling water system by hydro turbines," Energy, Elsevier, vol. 139(C), pages 329-340.

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