Metal hydrides for thermochemical energy storage applications. (4th May 2021)

• Record Type: Journal Article
• Authors: Choudhari, Manoj S.; Sharma, Vinod Kumar; Paswan, Manikant
• Is Part Of: International journal of energy research. Volume 45:Number 10(2021)
• Page Start: 14465
• Page End: 14492
• Publication Date: 2021-05-04
• Subjects: hydrogen storage -- metal hydrides -- pressure‐concentration isotherm -- thermal energy storage -- thermodynamic properties; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.6818
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Due to the depletion of natural energy resources, worldwide, solar energy is accepted as an emerging energy source because it is free, endless and can be convertible to other forms, but it is intermittent. Therefore, in the present study, different energy storage techniques, that is, sensible heat, latent heat and thermochemical heat storage techniques, suitable to store solar thermal energy are discussed and compared. Based on the energy storage density, reaction kinetics, operating temperature range and volume of storage material, the metal hydride‐based thermal energy storage (MH‐TES) system is observed to be the most promising for thermochemical energy storage applications. In continuation, the current work enlightens on the screening of MHs best‐suited to the MH‐TES, which results in the alloy pairs of MmNi4.15 Fe0.85 ‐TiCrMn and LaNi4.85 Al0.15 ‐MmNi4.6 Fe0.4, working on high‐pressure and low‐pressure sides, respectively. The thermodynamic performances are observed to be 140.25 and 188.16 kJ of heat generation with a coefficient of performance of 0.47 and 0.50 for MmNi4.15 Fe0.85 ‐TiCrMn and LaNi4.85 Al0.15 ‐MmNi4.6 Fe0.4 pairs, respectively, working at a temperature range of 403 (storage), 298 (ambient), 373 (regeneration) and 423 K (heat output). The study is extended to investigate the influence of operating temperatures on system performance and observed that the heat generation may be reduced by ~5% by increasing heat output temperature by 20 K due to reduction in mass transfer. Abstract : Different energy storage systems are discussed and compared. Different metal hydrides (MHs) used for a thermochemical energy storage system (MH‐TES) are presented. Screening of MHs is carried out to identify the best‐suited pair for MH‐TES working at low‐pressure and high‐pressure ranges. The performance of MH‐TES is evaluated through thermodynamic simulation. MH‐TES possesses a heat generation of 140.25 kJ with a coefficient of performance of 0.47.