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Experimental studies were performed with metal hydride powder La0.75Ce0.25Ni5 in the current work. Own choice of AB5-alloy conditioned by sufficient mass content of hydrogen (up to 1.4 %), moderate pressure − at 45° C about 4 MPa and commercial cost. A spiral heat exchanger was placed in a hydrogen tank with a hydraulic volume of 12 liters, and it occupies 65 % of the total height of the tank. Thus, part of the metal hydride was out of direct contact with the thermal surface of the heat exchanger. In chemical processes the coil either removed heat or brought. It is noted that the duration of the fuel cell was twice as high when in the process of desorption heat was supplied to the system. Energy costs for own needs of heating and water circulation amounted to 220 W, and the useful power generated by the fuel cell − 800 W. Thermocouples located at different levels of the tank showed an average temperature difference from 3 to 7.5° C when passed absorption or desorption H2.

Improvement of Hydrogen Absorption and Desorption for AB5-Alloy by a Spiral Heat Exchanger