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CFD Analysis of a Buffer Tank Redesigned with a Thermosyphon Concentrator Tube

Author

Listed:
  • Miguel A. Gómez

    (Defense University Center, Spanish Naval Academy, Plaza de España s/n 36900 Marín, Spain)

  • Sergio Chapela

    (Industrial Engineering School, University of Vigo, Lagoas-Marcosende s/n 36310 Vigo, Spain)

  • Joaquín Collazo

    (Industrial Engineering School, University of Vigo, Lagoas-Marcosende s/n 36310 Vigo, Spain)

  • José L. Míguez

    (Industrial Engineering School, University of Vigo, Lagoas-Marcosende s/n 36310 Vigo, Spain)

Abstract

This study analyzes a buffer tank simulated in both continuous operation mode and heating mode using CFD techniques. The analysis is focused in the thermal behavior of the tank, especially in parameters such as heat exchanged, heating time, and temperature distributions into the tank, in order to propose a better design. The results of the different simulations show that the tank heats water extremely slowly and extremely evenly when producing domestic hot water (DHW), which negatively affects the thermal stratification that is critical for rapidly reaching the DHW temperature. Therefore, the main problem of the tank is an inefficient heat exchange and a poor distribution of temperature. In order to overcome these operational limitations, a new design is proposed by installing a tube inside the tank that encloses the heating coil and sends hot water directly to the tank top region such that high-temperature DHW is rapidly provided, and thermal stratification is improved. Several simulations are performed with different open and closed configurations for the outlets of the inner tube. The different results show that the heating times significantly improve, and the time needed to reach the 45 °C set point temperature is reduced from 44 to 15 min. In addition, the simulations in which the opening and closing of the water outlets are regulated, the outlet DHW temperature is kept within 45–60 °C, which prevents overheating to unsafe use temperatures. Furthermore, the results of the simulation in continuous operation mode show a clear improvement of thermal stratification and an increase in the heat transmitted to the inside of the tank.

Suggested Citation

  • Miguel A. Gómez & Sergio Chapela & Joaquín Collazo & José L. Míguez, 2019. "CFD Analysis of a Buffer Tank Redesigned with a Thermosyphon Concentrator Tube," Energies, MDPI, vol. 12(11), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2162-:d:237652
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    References listed on IDEAS

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    1. Wang, Zilong & Zhang, Hua & Dou, Binlin & Huang, Huajie & Wu, Weidong & Wang, Zhiyun, 2017. "Experimental and numerical research of thermal stratification with a novel inlet in a dynamic hot water storage tank," Renewable Energy, Elsevier, vol. 111(C), pages 353-371.
    2. Ievers, Simon & Lin, Wenxian, 2009. "Numerical simulation of three-dimensional flow dynamics in a hot water storage tank," Applied Energy, Elsevier, vol. 86(12), pages 2604-2614, December.
    3. Han, Y.M. & Wang, R.Z. & Dai, Y.J., 2009. "Thermal stratification within the water tank," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(5), pages 1014-1026, June.
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