Naslov
Selection of metal hydrides-based thermal energy storage: energy storage efficiency and density targets

Autori
Nyamsi, Serge Nyallang ; Lototskyy, Mykhaylo ; Tolj, Ivan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 9th International Exergy, Energy and Environment Symposium (IEEES-9) / - , 2017, 676-685

ISBN
978-953-290-069-9

Skup
9th International Exergy, Energy and Environment Symposium (IEEES-9)

Mjesto i datum
Split, Hrvatska, 14.05.2017. - 17.05.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Thermal energy storage ; metal hydride ; heat management ; energy storage efficiency ; energy storage density

Sažetak
Thermochemical energy storage based on metal hydrides has gained tremendous interest in concentrated solar power systems (CSP). In such systems, two metal hydride beds are connected and operating in an alternative way as energy storage or hydrogen storage. However, the selection of metal hydrides is essential for a smooth operation of these CSP systems in terms of energy storage efficiency and density. In this study, thermal energy storage systems using metal hydrides are modeled and analyzed in detail using first law of thermodynamics. For these purpose, four conventional metal hydrides are selected namely LaNi5, Mg, Mg2Ni and Mg2FeH6. The comparison of performance is made in terms of volumetric energy storage and energy storage efficiency. The effects of operating conditions (temperature, hydrogen pressure and heat transfer fluid mass flow rates) and reactor design on the aforementioned performance metrics are studied and discussed in detail. The preliminary results showed that Mg-based hydrides store energy ranging from 1.3-2.4 GJ.m-3 while the energy storage can be as low as 30 % due to their slow intrinsic kinetics. On the other hand, coupling Mg- based hydrides with LaNi5 allow us to recover heat at a useful temperature above 330 K with low energy density ca.500 MJ.m-3 provided suitable operating conditions are selected. The results of this study will be helpful to screen out all potentially viable hydrides materials for heat storage applications.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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