Abstract: The present invention relates to a method and apparatus for preparing metal-embedded porous metallic-hydride (pmh) compacts capable of with standing repeated hydriding-dehydriding cycles without disintegrating. According to the invention, the finely divided hydridable metal alloy hydride is admixed with a finely divided metal selected from Al, Ni, Cu or other transition metals and charged with hydrogen. The resulting mixture is sintered in a furnace in which hydrogen is introduced at a pressure above the equilibrium pressure to the prevailing temperature, mechanical stress being applied simultaneously. The compacts obtained possess outstanding stability, as shown by the fact that they have remained intact even after more than 6000 cycles.

Abstract: The present invention relates to a method and apparatus for preparing metal-embedded porous metallic-hydride (pmh) compacts capable of withstanding repeated hydriding-dehydring cycles without disintegrating. According to the invention, the finely divided hydridable metal alloy hydride is admixed with a finely divided metal selected from Al, Ni, Cu or other transition metals and charged with hydrogen. The resulting mixture is sintered in a furnace in which hydrogen is introduced at a pressure above the equilibrium pressure to the prevailing temperature, mechanical stress being applied simultaneously. The compacts obtained possess outstanding stability, as shown by the fact that they have remained intact even after more than 6000 cycles.

Abstract: Air-conditioning is carried out using a "hydrogen heat pump" driven by waste heat. The hydrogen heat pump includes at least two and preferably four units, wherein hydrogen passes between low-temperature and high-temperature porous metal hydride compacts, each unit having a pair of heat exchangers associated therewith.

Abstract: A method for preparing porous metallic-matrix hydride compacts which can be repeatedly hydrided and dehydrided without disintegration. A mixture of a finely divided metal hydride and a finely divided matrix metal is contacted with a poison which prevents the metal hydride from dehydriding at room temperature and atmospheric pressure. The mixture of matrix metal and poisoned metal hydride is then compacted under pressure at room temperature to form porous metallic-matrix hydride compacts.