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Numerical study on the cooling performance of natural draft dry cooling tower with vertical delta radiators under constant heat load

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  • Zhao, Yuanbin
  • Sun, Fengzhong
  • Li, Yan
  • Long, Guoqing
  • Yang, Zhi

Abstract

From the view of cooling system, the natural draft dry cooling tower with vertical delta radiators (NDDCTV) under constant heat load can be studied by keeping constant water temperature drop Δtw. With computed entry water temperature tw1 as the sum of tower exit water temperature tw2 and the constant Δtw, a three-dimensional (3D) numerical model for NDDCTV under constant heat load was established. Through analyses about mesh-independence, sensitivity about crosswind profile index and comparison with published results, the accuracy and credibility of the established numerical model for NDDCTV were confirmed. The aerodynamic field around cooling deltas was analyzed at windless and crosswind conditions, so as to clarify the impacts of ambient air temperature and air inflow deviation angle θd on the performance of cooling columns. With constant heat load and uniform entry water temperature, the cooling performance of each sector was analyzed under crosswind impact. With increasing crosswind velocity vc, the cooling performance of NDDCTV under constant heat load deteriorates sharply at low vc, but varies slightly at high vc, which can be improved by air deflectors.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:149:y:2015:i:c:p:225-237
    DOI: 10.1016/j.apenergy.2015.03.119
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    8. Wang, Weiliang & Zhang, Hai & Liu, Pei & Li, Zheng & Lv, Junfu & Ni, Weidou, 2017. "The cooling performance of a natural draft dry cooling tower under crosswind and an enclosure approach to cooling efficiency enhancement," Applied Energy, Elsevier, vol. 186(P3), pages 336-346.
    9. Hu, Hemin & Li, Zhigang & Jiang, Yuyan & Du, Xiaoze, 2018. "Thermodynamic characteristics of thermal power plant with hybrid (dry/wet) cooling system," Energy, Elsevier, vol. 147(C), pages 729-741.
    10. Zhao Li & Huimin Wei & Tao Wu & Xiaoze Du, 2021. "Optimization for Circulating Cooling Water Distribution of Indirect Dry Cooling System in a Thermal Power Plant under Crosswind Condition with Evolution Strategies Algorithm," Energies, MDPI, vol. 14(4), pages 1-17, February.
    11. Li, Xiaoxiao & Duniam, Sam & Gurgenci, Hal & Guan, Zhiqiang & Veeraragavan, Anand, 2017. "Full scale experimental study of a small natural draft dry cooling tower for concentrating solar thermal power plant," Applied Energy, Elsevier, vol. 193(C), pages 15-27.
    12. 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.
    13. Mohan Liu & Lei Chen & Kaijun Jiang & Xiaohui Zhou & Zongyang Zhang & Hanyu Zhou & Weijia Wang & Lijun Yang & Yuguang Niu, 2021. "Investigation of Thermo-Flow Characteristics of Natural Draft Dry Cooling Systems Designed with Only One Tower in 2 × 660 MW Power Plants," Energies, MDPI, vol. 14(5), pages 1-18, February.
    14. Wu, Tao & Ge, Zhihua & Yang, Lijun & Du, Xiaoze, 2019. "Modeling the performance of the indirect dry cooling system in a thermal power generating unit under variable ambient conditions," Energy, Elsevier, vol. 169(C), pages 625-636.
    15. Lu, Yuanshen & Klimenko, Alexander & Russell, Hugh & Dai, Yuchen & Warner, John & Hooman, Kamel, 2018. "A conceptual study on air jet-induced swirling plume for performance improvement of natural draft cooling towers," Applied Energy, Elsevier, vol. 217(C), pages 496-508.
    16. Kong, Yanqiang & Wang, Weijia & Yang, Lijun & Du, Xiaoze, 2020. "Energy efficient strategies for anti-freezing of air-cooled heat exchanger," Applied Energy, Elsevier, vol. 261(C).
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