COLD STORAGE MEDIUM, COLD ACCUMULATOR, AND CRYOGENIC COLD STORAGE TYPE REFRIGERATING MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a more environment-friendly and inexpensive cold storage medium easily turned into a spherical shape, having sufficient mechanical strength for use and having a superior thermal property when used for a refrigerating machine.;SOLUTION: The cold storage medium includes granular bodies of bismuth alone in which a rate of the granular bodies having ≥0.14 mm and ≤1.6 mm of a grain size is set to be 70 wt.% or more with respect to the whole granular bodies and a rate of the granular bodies of which ratio of the major axis with respect to the minor axis is 5 or less is set to be 70 wt.% or more with respect to the whole granular bodies.;COPYRIGHT: (C)2011,JPO&INPIT