a heat transfer system comprising a hydrogen supply unit 1 , which transfers hydrogen from a hydrogen recovery tube 8 to a hydrogen supply tube 7 , and a multiplicity of hydrogen utilization units 2a and 2b which utilize hydrogen supplied from the hydrogen supply tube 7 via its branching tubes 7a and 7b , respectively , and return hydrogen to the hydrogen recovery tube 8 via associated branching tubes 8a and 8b . by the use of the hydrogen supply tube 7 and the hydrogen recovery tube 8 having large volumetric capacities and filled with hydrogen , the hydrogen supply unit 1 and the hydrogen utilization units 2a and 2b may operate independently , without being synchronized one other .