Abstract
Storage units containing LaNi 4.6Al 0.4 as hydrogen storage material were tested with regard to their dynamic behaviour in energy conversion systems. For hydrogen absorption of a single storage unit at 286 K, a half-reaction time of 90 s was found at a constant hydrogen pressure of 5.0 bar. The dynamic “quasi-isotherms” showed an increasing hysteresis with increasing hydrogen sorption rates. In a dual-hydride bed assembly (chemical compressor) the hydrogen flow, the total hydrogen flow and the hydrogen pressure were measured at various half-cycle times with water at 286 and 353 K. The calculation of the operating characteristics of such a system based on the experimental data shows that the efficiency of energy conversion decreases with increasing hydrogen flow.
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