This paper indicates the effective thermal conductivity of the hydrogen absorbing alloys bed of the passive type hydrogen storing systems for residential energy systems or stand-alone power supplies by experimental measurement.
The effective thermal conductivity of the alloys bed depended on the cylinder pressure and the H/M composition of the alloys. Moreover, the conductivity was linear to the H/M composition at Plateau area.
The introduction of 15 mass% Cu wires to the bed for improving the heat transfer was effective to raise the effective thermal conductivity of the bed. 50% of void fraction of the bed was also useful. The use of MmNi5 resulted in raising the effective thermal conductivity compared to the use of MmNi4.50Co0.10Al0.15Mn0.25 at the same H/M composition and the void fraction.
