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Model development and performance investigation of staggered tube-bundle heat exchanger for seawater source heat pump

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  • Wu, Zhenjing
  • You, Shijun
  • Zhang, Huan
  • Zheng, Wandong

Abstract

Seawater heat pump system exhibits merits of reducing building energy consumption, while enhancing the heat transfer of seawater heat exchangers is the key to improve the system performance. The effect of seawater flow behavior on the thermal performance of seawater heat exchanger immersed in oscillating flow is significant but often neglected. An unsteady mathematical model was firstly developed to describe heat transfer of oscillating flow around the staggered tube-bundle heat exchanger and verified by experimental results. Effects of the structural and operational parameters, such as the tube length, heat transfer fluid velocity, wave parameters and sinking depth on the thermal performance were analyzed. It was shown that the thermal efficiency of seawater heat exchanger ascended with the increase of wave amplitude and decrease of the heat exchanger sinking depth. Additionally, the tube length and heat transfer fluid velocity could be reasonably designed to achieve the optimum value between cost and performance. The heat transfer mechanism in seawater side was predominated by forced convection to natural convection with the increasing sinking depth under various wave parameters. The proposed model is favorable to delicately characterize the heat transfer of seawater heat exchanger with the consideration of seawater flow. The results in this paper is helpful to guide the optimization on designing the staggered tube-bundle heat exchanger in oscillating flow and to promote the application of ocean thermal energy.

Suggested Citation

  • Wu, Zhenjing & You, Shijun & Zhang, Huan & Zheng, Wandong, 2020. "Model development and performance investigation of staggered tube-bundle heat exchanger for seawater source heat pump," Applied Energy, Elsevier, vol. 262(C).
    • Handle: RePEc:eee:appene:v:262:y:2020:i:c:s0306261920300167
    DOI: 10.1016/j.apenergy.2020.114504
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    References listed on IDEAS

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    1. Zhang, Yongyu & Gao, Ran & Si, Pengfei & Shi, Lijun & Shang, Yinghui & Wang, Yi & Liu, Boran & Du, Xueqing & Zhao, Kejie & Li, Angui, 2023. "Study on performances of heat-oxygen coupling device for high-altitude environments," Energy, Elsevier, vol. 272(C).
    2. Zheng, Wandong & Yin, Hao & Li, Bojia & Zhang, Huan & Jurasz, Jakub & Zhong, Lei, 2022. "Heating performance and spatial analysis of seawater-source heat pump with staggered tube-bundle heat exchanger," Applied Energy, Elsevier, vol. 305(C).

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