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Investigation on the thermal performance of rectangular energy storage devices during simultaneous charging and discharging processes

Author

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  • Deng, D.L.
  • Ma, Y.
  • Tao, Y.
  • Du, R.Q.
  • Wang, Y.

Abstract

Simultaneous charging and discharging (SCD) of latent thermal energy storage (LTES) can effectively improve the flexibility of solar thermal heating systems and ensure the continuity of energy supply. However, the research on the thermal performance of the SCD process of the energy storage device under the effect of two different heat transfer fluids is insufficient. In this paper, experimental and numerical simulations are carried out to reveal the thermal behavior of rectangular energy storage device (RESD) in SCD mode. The effects of different inlet water and air temperatures on the device are analyzed. The results indicated that the temperature of the phase change material (PCM)、water and air will reach a steady state when the RESD is operated in SCD mode. The time to reach stabilization is related to the inlet water temperature; the higher the inlet water temperature, the shorter the time to reach stabilization. When the inlet water temperature increases from 30 °C to 35 °C and 40 °C, the time required to reach a stable state decrease by 30.9 % and 53.4 %, respectively. When the inlet air temperature was increased from 2 °C to 6 °C and 10 °C, the liquid fraction of PCM at stabilization increased by 8.2 % and 16.6 %, respectively, and the temperature at stabilization of PCM increased by 3.2 % and 6.8 %, respectively, while the different inlet air temperatures had almost no effect on the length of time it took for the system to reach stabilization. In addition, SCD extends the effective heat release duration by 65 % compared to independent discharging (ID).

Suggested Citation

  • Deng, D.L. & Ma, Y. & Tao, Y. & Du, R.Q. & Wang, Y., 2025. "Investigation on the thermal performance of rectangular energy storage devices during simultaneous charging and discharging processes," Renewable Energy, Elsevier, vol. 242(C).
    • Handle: RePEc:eee:renene:v:242:y:2025:i:c:s0960148125001296
    DOI: 10.1016/j.renene.2025.122467
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    References listed on IDEAS

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