4K-GM冷凍機に関する研究 : 蓄冷材の比熱が冷凍能力に及ぼす影響

概要

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This paper describes an analysis of the effects of the specific heat of the regenerator material on the refrigeration capacity of a 4K GM refrigerator. The facts revealed by the analysis are given below. When the specific heat of the regenerator material is changed from 1.5 J/(K・cm^3) to 0.01 J/(K・cm^3), the no load temperature is changed from 2.11 K to 26.9 K. The lowest temperature that can be theoretically attained in this refrigerator is the temperature around the λ point of helium. The specific heat of the regenerator material reaches a sufficient level at 0.8 J/(K・cm^3). The refrigeration capacity is found to be superior over a wide temperature range when the specific heat distribution is uniform than when it has a peak. When regenerator materials of different types are stacked in stratified formation, the material stacked at the cold part of the regenerator may have a small specific heat at high temperatures, but the material stacked at the hot part of the regenerator should desirably have a large specific heat at low temperatures.
社団法人日本機械学会の論文
1999-01-25