Abstract
Heat charging and discharging performances and cycling stability of the coupled MgH2–LaNi5 thermal storage system are investigated. Heat storage reaction is studied by tracking temperatures and pressures of hydride beds as well as hydrogen mass flow rates exchanging between MgH2 and LaNi5. Upon 20 heat storage cycles, MgH2–LaNi5 pair reveals remarkably cycling stability with the energy densities during heat charging and discharging of 797 ± 37.5 and 680 ± 28 kJ/kg, respectively. The hydrogen content exchange between MgH2 and LaNi5 during heat storage cycles is up to 57 % of theoretical hydrogen capacity. The possibilities to enhance the hydrogen contents participating in the heat storage reaction are discussed. The heat charging and discharging performances at different positions in the hydride beds of MgH2–LaNi5 pair are characterized. Not only thermodynamic compatibility of MgH2 and LaNi5 but also kinetics as well as hydrogen and heat transfer in MgH2 beds considerably influence heat storage performance.
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