Thermochemical energy storage using coupled metal hydride beds of Mg-LaNi5 composites and LaNi5 based hydrides for concentrated solar power plants

Sarath Babu, K and Anil Kumar, E and Srinivasa Murthy, S (2023) Thermochemical energy storage using coupled metal hydride beds of Mg-LaNi5 composites and LaNi5 based hydrides for concentrated solar power plants. In: Applied Thermal Engineering, 219 .

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Abstract

Thermochemical energy storage based on coupled hydride beds is an attractive option for Concentrated Solar Power plant applications due to its efficient long term and high energy storage density. In the coupled system, a high temperature metal hydride (HTMH) bed is coupled with a low temperature metal hydride (LTMH) bed. In the present study, Mg-LaNi5 composite hydrides are taken as HTMHs due to their high absorption capacity and high reaction enthalpy, and LaNi5 based alloys are taken as LTMHs as these hydrides are ideal for hydrogen storage at ambient conditions. The thermodynamic properties such as reaction enthalpy and entropy are evaluated by measuring Pressure Concentration Isotherms of Mg-x wt LaNi5 (x = 20 and 30) composites, LaNi4.7Al0.3 and LaNi4.6Al0.4. A new methodology for storing and recovering thermal energy together with upgradation of the quality of energy is established. Methodology to determine the minimum energy storage temperature and maximum energy recovery temperature is proposed. The quality of the thermal energy will be improved by increase in delivery temperature. Thermodynamic analysis is performed using measured properties to evaluate the performance parameters such as heat upgradation, coefficient of performance (COP), and energy storage density (ESD). Maximum COP and ESD of 0.705 and 418.841 kJ/kg, respectively is obtained for hydride pair Mg-5 wt LaNi5-La0.8Ce0.2Ni5. Maximum degree of upgradation of 34 °C is obtained using the hydride pair Mg-20 wt LaNi5-LaNi4.7Al0.3. The effects of variation of heat source temperature, regeneration temperature and ambient temperature on the performance of the MHTES is studied. It is observed that the regeneration temperature is a significant parameter that influences the performance of the MHTES. © 2022 Elsevier Ltd

Item Type:	Journal Article
Publication:	Applied Thermal Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Aluminum alloys; Binary alloys; Concentrated solar power; Electrons; Hydrogen storage; Isotherms; Magnesium alloys; Metals; Solar energy; Temperature; Thermoanalysis, Composite hydride; Concentrated solar power; Concentrated solar power plant; Hydride bed; Metal-hydrides; Pressure concentration; Pressure concentration isotherm; Reaction enthalpies; Thermochemical energy storage; Up gradations, Hydrides
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Date Deposited:	29 Dec 2022 05:36
Last Modified:	29 Dec 2022 05:36
URI:	https://eprints.iisc.ac.in/id/eprint/78606

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