Cold

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PURPOSE : To improve the thermal storage efficiency at a specific temperature or lower by improving the specific heat at the specific temperature. CONSTITUTION : In the cool storage unit filled with cool storage material, the material is represented by Ra Agb Mc , where R is rare earth element of at least one or more types of Ce, Pr, Nd, Gd, Dy, Ho, Er and Tm, M is at least one type of element of B, Al, In, Si, Ge, Ga, Sn, Au, Mg, Zn, Pd, Pt, Re, Cs, Ir, Fe, Mn, Cr, Cd, Hg, Os, P, La and Y, the content (a) of the R is 20at%<=a<=96at%, the content (c) of the M is 5at%<=c<=25at%, and the content (b+c) of the total of the Ag and M is 5at%<=b+c<=80at%.