低消費電力(2 kWクラス)4 K-GM冷凍機の能力特性

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  • Cooling Capacity Characteristics of Low Power Consumption (2 kW Class) 4 K-GM Cryocoolers

抄録

<p>From the COP (Coefficient of Performance) equation, there are two ways to improve the cooling efficiency of cryocoolers: (1) increasing the cooling capacity, and (2) decreasing the electrical input power. In recent years, we have focused on the possibility of method (2) for a 4 K-GM (Gifford-McMahon) cryocooler. In this paper, a 7 kW class compressor, which is commonly connected to a 4 K-GM cold head, was replaced with a low power consumption (2 kW class) compressor. The experiments achieved a measured cooling capacity of 0.95 W at 4.2 K with a cold head reciprocation speed of 36 rpm and a compressor electrical input of 1.9 kW. The calculated COP and the relative Carnot efficiency were 5.0×10-4 and 3.5 %, respectively. A low reciprocating speed was selected to secure sufficient expansion work in the second expansion space. This is an effective method to improve the cooling capacity at 4.2 K by a low power consumption compressor.</p>

収録刊行物

  • 低温工学

    低温工学 58 (2), 69-73, 2023-03-20

    公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

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