IJET 2024 Vol.16(3): 149-154
DOI: 10.7763/IJET.2024.V16.1272
Heat Transfer and Performance Analysis of NaMgH2F-based Thermochemical Energy Storage System
Sumeet Kumar Dubey1, K. Ravi Kumar1,*, Vinay Tiwari2, and Umish Srivastva2
1. Department of Energy Science and Engineering, Indian Institute of Technology (IIT) Delhi, New Delhi, India
2. Department of Alternate Energy, Indian Oil Corporation R&D Centre, Faridabad, Haryana, India
Email: dubeysumeet92@gmail.com (S.K.D.); krk@dese.iitd.ac.in (K.R.K.); tiwarivd@indianoil.in (V.T.); srivastavau@indianoil.in (U.S.)
*Corresponding author
Manuscript received April 10, 2024; revised May 16, 2024; accepted June 8, 2024; published August 9, 2024
Abstract—Thermochemical energy storage systems are more suitable for high-temperature energy storage because of thermal stability and high energy storage density. Magnesium (Mg) based metal alloys and hydrides are found more suitable for high temperature energy storage applications among metal hydride-based thermochemical systems. The unit weight of NaMgH
2F is used to analyze the energy sorption and heat transfer phenomenon. Initial metal hydride bed temperature variation and two heat transfer fluid flow arrangements are compared to study the heat transfer phenomenon and performance characteristics. The two initial metal hydride bed temperatures used in the analysis are 773 K and 823 K. Heat transfer flow Configuration 1 has axial tubes in the cross-section, while Configuration 2 has a circumferential fluid jacket along with the axial tubes. Both configurations have the same heat transfer area for the comparative study of heat transfer. The energy absorption was not affected significantly, but the energy desorption increased with an increase in metal hydride bed temperature and with the outer circumferential cooling jacket configuration. The energy storage efficiency of 93.2% and 94.4% is obtained for initial metal hydride bed temperatures of 773 K and 823 K with flow configuration 1, while the energy storage efficiency of 95.2% and 96.4% is obtained for 773 K and 823 K with flow Configuration 2.
Keywords—thermochemical energy storage, metal hydrides, complex metal hydride, thermal battery, storage efficiency
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Cite: Sumeet Kumar Dubey, K. Ravi Kumar, Vinay Tiwari, and Umish Srivastva, "Heat Transfer and Performance Analysis of NaMgH2F-based Thermochemical Energy Storage System," International Journal of Engineering and Technology, vol. 16, no. 3, pp. 149-154, 2024.
