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Numerical Research on Thermodynamic Properties of a Thermocline in Thermal Energy Storage Tank Based on Modified One-Dimensional Dimensionless Model

Author

Listed:
  • Haoran Ju

    (Heating Research Center, Huadian Electric Power Research Institute, 2 Xiyuan Nine Road, Hangzhou 310030, China
    College of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310007, China)

  • Lijun Zheng

    (Heating Research Center, Huadian Electric Power Research Institute, 2 Xiyuan Nine Road, Hangzhou 310030, China)

  • Wei Zhong

    (College of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310007, China)

Abstract

The application of thermal energy storage (TES) has been proved effective to improve the energy utilization efficiency of renewable energy and industrial waste heat energy. In this paper, a modified one-dimensional dimensionless model for the thermocline thermal energy storage tank is derived to simulate the system more accurately. An adaptive strategy for solving region compartmentalization is proposed for reducing computing time. Based on the proposed model, the effects of three different parameters on the performance of the thermocline tank are studied. The results show that increasing the inlet velocity can reduce the thickness of the thermocline and improve the system efficiency. Increasing the temperature difference between hot and cold water leads to a thicker thermocline, but the thermal energy stored in the tank increases. Increasing the tank height has no effect on the motion characteristic of thermocline, but the system efficiency can be increased.

Suggested Citation

  • Haoran Ju & Lijun Zheng & Wei Zhong, 2023. "Numerical Research on Thermodynamic Properties of a Thermocline in Thermal Energy Storage Tank Based on Modified One-Dimensional Dimensionless Model," Energies, MDPI, vol. 16(22), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:22:p:7499-:d:1276633
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    References listed on IDEAS

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    1. Castell, A. & Medrano, M. & Solé, C. & Cabeza, L.F., 2010. "Dimensionless numbers used to characterize stratification in water tanks for discharging at low flow rates," Renewable Energy, Elsevier, vol. 35(10), pages 2192-2199.
    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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