Tests on LmNi4.91Sn0.15 based solid state hydrogen storage device with embedded cooling tubes – Part B: Desorption process

•Two LmNi4.91Sn0.15 based H2 storage devices were built and tested.•Two configurations of embedded cooling tubes viz., 36 and 60 were considered.•Dehydriding characteristics were studied at different operating conditions.

In this Part B manuscript, the performance tests on LmNi4.91Sn0.15 based two solid state hydrogen storage devices with 36 and 60 embedded cooling tubes (ECT) during desorption of hydrogen are presented. The results of a systematic investigation of these reactors during hydrogen desorption process at different operating conditions are discussed while the absorption characteristics are reported in part A of this manuscript. The desorption characteristics of the hydrogen storage devices are studied by varying the hot fluid temperature (30 °C–60 °C), and the heat transfer fluid flow rate (2.2 l/min–30 l/min). In the reactor with 36 ECT and 60 ECT, with oil flow rate of 3.2 l/min, at 60 °C hot fluid temperature, the hydride bed attains the initial hot fluid temperature rapidly. At the desorption condition of 50 °C desorption temperature, 30 l/min of water flow rate, the reactor with 60 ECT completes the desorption of hydrogen within 8 min.