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Heat-transfer characteristics of a latent heat storage system using MgCl2 · 6H2O

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  • Choi, Jong Chan
  • Kim, Sang Done

Abstract

Heat-transfer characteristics have been determined for the circular finned and unfinned-tube units during the freezing of magnesium chloride hexahydrate (MgCl2 · 6H2O) used as a phase-change material (PCM) with a melting temperature of 116.7 °C. The effects on the heat-transfer characteristics have been determined of the inlet temperature and the flow rate of air used as the heat-transfer fluid (HTF). With the unfinned-tube unit, the heat-transfer coefficients obtained between the PCM and the tube are larger than the calculated values based on the theory of steady-state heat conduction due to the dendritical crystal growth of PCM. The ratio of the heat-transfer coefficient of the finned-to the unfinned-tube systems is about 3.5 within the finned section and decreases gradually far from the finned section with an increase in crystal volume. The total amounts of heat recovered have been correlated in terms of the Fourier, Stefan, and Reynolds numbers to provide basic design data for circular finned- and unfinned-tube heat-storage units.

Suggested Citation

  • Choi, Jong Chan & Kim, Sang Done, 1992. "Heat-transfer characteristics of a latent heat storage system using MgCl2 · 6H2O," Energy, Elsevier, vol. 17(12), pages 1153-1164.
    • Handle: RePEc:eee:energy:v:17:y:1992:i:12:p:1153-1164
    DOI: 10.1016/0360-5442(92)90004-J
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    3. Du, Kun & Calautit, John & Wang, Zhonghua & Wu, Yupeng & Liu, Hao, 2018. "A review of the applications of phase change materials in cooling, heating and power generation in different temperature ranges," Applied Energy, Elsevier, vol. 220(C), pages 242-273.
    4. Yang, Xiaohu & Lu, Zhao & Bai, Qingsong & Zhang, Qunli & Jin, Liwen & Yan, Jinyue, 2017. "Thermal performance of a shell-and-tube latent heat thermal energy storage unit: Role of annular fins," Applied Energy, Elsevier, vol. 202(C), pages 558-570.
    5. Ge, Ruihuan & Li, Qi & Li, Chuan & Liu, Qing, 2022. "Evaluation of different melting performance enhancement structures in a shell-and-tube latent heat thermal energy storage system," Renewable Energy, Elsevier, vol. 187(C), pages 829-843.
    6. Agyenim, Francis & Eames, Philip & Smyth, Mervyn, 2010. "Heat transfer enhancement in medium temperature thermal energy storage system using a multitube heat transfer array," Renewable Energy, Elsevier, vol. 35(1), pages 198-207.
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    8. Bal, Lalit M. & Satya, Santosh & Naik, S.N. & Meda, Venkatesh, 2011. "Review of solar dryers with latent heat storage systems for agricultural products," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(1), pages 876-880, January.
    9. Pathak, Saurabh & Jain, Komal & Kumar, Prashant & Wang, Xu & Pant, R.P., 2019. "Improved thermal performance of annular fin-shell tube storage system using magnetic fluid," Applied Energy, Elsevier, vol. 239(C), pages 1524-1535.
    10. Agyenim, Francis & Hewitt, Neil & Eames, Philip & Smyth, Mervyn, 2010. "A review of materials, heat transfer and phase change problem formulation for latent heat thermal energy storage systems (LHTESS)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(2), pages 615-628, February.
    11. Xu, Ben & Li, Peiwen & Chan, Cholik, 2015. "Application of phase change materials for thermal energy storage in concentrated solar thermal power plants: A review to recent developments," Applied Energy, Elsevier, vol. 160(C), pages 286-307.
    12. Huang, M.J. & Eames, P.C. & McCormack, S. & Griffiths, P. & Hewitt, N.J., 2011. "Microencapsulated phase change slurries for thermal energy storage in a residential solar energy system," Renewable Energy, Elsevier, vol. 36(11), pages 2932-2939.
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    14. Agyenim, Francis & Eames, Philip & Smyth, Mervyn, 2011. "Experimental study on the melting and solidification behaviour of a medium temperature phase change storage material (Erythritol) system augmented with fins to power a LiBr/H2O absorption cooling syst," Renewable Energy, Elsevier, vol. 36(1), pages 108-117.
    15. Guelpa, Elisa & Sciacovelli, Adriano & Verda, Vittorio, 2013. "Entropy generation analysis for the design improvement of a latent heat storage system," Energy, Elsevier, vol. 53(C), pages 128-138.
    16. Jegadheeswaran, S. & Pohekar, Sanjay D., 2009. "Performance enhancement in latent heat thermal storage system: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(9), pages 2225-2244, December.
    17. Ettouney, Hisham M. & Alatiqi, Imad & Al-Sahali, Mohammad & Ahmad Al-Ali, Safaa, 2004. "Heat transfer enhancement by metal screens and metal spheres in phase change energy storage systems," Renewable Energy, Elsevier, vol. 29(6), pages 841-860.
    18. Abokersh, Mohamed Hany & El-Morsi, Mohamed & Sharaf, Osama & Abdelrahman, Wael, 2017. "An experimental evaluation of direct flow evacuated tube solar collector integrated with phase change material," Energy, Elsevier, vol. 139(C), pages 1111-1125.
    19. Zheng, Zhang-Jing & Cai, Xiao & Yang, Chao & Xu, Yang, 2022. "Improving the solidification performance of a latent heat thermal energy storage unit using arrow-shaped fins obtained by an innovative fast optimization algorithm," Renewable Energy, Elsevier, vol. 195(C), pages 566-577.
    20. Gupta, Rajan & Shinde, Shraddha & Yella, Aswani & Subramaniam, C. & Saha, Sandip K., 2020. "Thermomechanical characterisations of PTFE, PEEK, PEKK as encapsulation materials for medium temperature solar applications," Energy, Elsevier, vol. 194(C).
    21. Han, Pengju & Lu, Lixin & Qiu, Xiaolin & Tang, Yali & Wang, Jun, 2015. "Preparation and characterization of macrocapsules containing microencapsulated PCMs (phase change materials) for thermal energy storage," Energy, Elsevier, vol. 91(C), pages 531-539.
    22. Agyenim, Francis, 2016. "The use of enhanced heat transfer phase change materials (PCM) to improve the coefficient of performance (COP) of solar powered LiBr/H2O absorption cooling systems," Renewable Energy, Elsevier, vol. 87(P1), pages 229-239.

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