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Experimental study on the discharging performance of solar storage tanks with different inlet structures

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  • Shuhong Li
  • Yang Li
  • Xiaosong Zhang
  • Cai Wen

Abstract

Water thermal stratification exists in the discharging process of solar storage tanks, and a high efficiency of thermal stratification can greatly improve the discharging performance of solar tanks. The water tank with dimensions of 0.8 m (height) × 0.4 m (width) × 0.4 m (length) and three kinds of inlet structures were investigated in this study. The inlets included a perforated inlet, slotted inlet and direct inlet. The discharging performance of the tank was studied by presenting some compared experiments. The dimensionless discharging time was defined to analyze the temperature change of top-layer and inter-layer of water. Quantitative analysis and comparison based on the effective discharging efficiency and carbon reduction in the tank with different inlet structures were carried out in this study. The results indicated that the perforated inlet and slotted inlet improved the performance of thermal stratification effectively. The effective discharging efficiency of the perforated inlet structure was 21% higher than that of a direct inlet with the flow rate of 5 l/min and the gap increased to 40% when the flow rate increased to 15 l/min. The application of the perforated inlet tank in the discharging process in all solar water heaters in China can provide a CO 2 reduction of 5.39 × 10-super-4t compared with the direct inlet tank. Copyright , Oxford University Press.

Suggested Citation

  • Shuhong Li & Yang Li & Xiaosong Zhang & Cai Wen, 2012. "Experimental study on the discharging performance of solar storage tanks with different inlet structures," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 8(3), pages 203-209, February.
    • Handle: RePEc:oup:ijlctc:v:8:y:2012:i:3:p:203-209
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    File URL: http://hdl.handle.net/10.1093/ijlct/cts023
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    Cited by:

    1. Wang, Letian & Yang, Zhen & Duan, Yuanyuan, 2015. "Influence of flow distribution on the thermal performance of dual-media thermocline energy storage systems," Applied Energy, Elsevier, vol. 142(C), pages 283-292.
    2. Osorio, Julian D. & Hovsapian, Rob & Ordonez, Juan C., 2016. "Effect of multi-tank thermal energy storage, recuperator effectiveness, and solar receiver conductance on the performance of a concentrated solar supercritical CO2-based power plant operating under di," Energy, Elsevier, vol. 115(P1), pages 353-368.
    3. Osorio, J.D. & Rivera-Alvarez, A. & Swain, M. & Ordonez, J.C., 2015. "Exergy analysis of discharging multi-tank thermal energy storage systems with constant heat extraction," Applied Energy, Elsevier, vol. 154(C), pages 333-343.

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