• 제목/요약/키워드: Gifford-McMahon Cryorefrigerator

검색결과 1건 처리시간 0.016초

2단 Gifford-McMahon 극저온냉동기의 특성실험 (An Experimental Study of the 2-stage Gifford-McMahon Cryorefrigerator)

  • 박성제;고득용;유창종;김의준;최헌오
    • 설비공학논문집
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    • 제5권3호
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    • pp.198-206
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    • 1993
  • Experimental results of two stage Gifford-McMahon cryorefrigerator are described. In-prototype experiments, drive mechanism is Scotch Yoke type driven by stepping motor, copper meshes and lead balls are used for regenerator's materials in the first stage and the second stage, respectively. To find optimal conditions of the cryopump, no load temperature and refrigeration capacity according to the variation of cycle frequency and operating pressure are measured, and the cool down and load characteristics at particular cycle frequencies are presented. In general, as the cycle frequency is lowered, no load temperature is dropped but refrigeration capacity is diminished. As the representative result, in a case that the cycle frequency is 70rpm and steady state pressure is 14 atm, no load temperature of second stage is lowered to 10.5K in 55 minuters, and in this situation the refrigeration capacity of the first stage is 42W at 80K, that of the second stage is 11 W at 20K.

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