Thermosiphon effect during cooling test of 200 m DC HTS cable facility
IVANOV Yury, 渡邉 裕文, 筑本 知子, 浜辺 誠, 高野 廣久, 孫 建, 山口 作太郎 （中部大）
Abstract:Thermosiphon effect is widely used in technology and, in particular, in cryogenic engineering. Several years ago it was also proposed to utilize natural circulation of liquid nitrogen to keep long HTS power cable at low temperature. This approach can reduce the cost of apparatus making it simpler and stable, and in ideal case HTS power transmission line may not contain the cryogenic pump. The feasibility of the present approach was confirmed theoretically and experimentally at 200 m DC HTS facility at Chubu University. Recently, during 6th cooling test the cryopump has stopped due to a controller fault. Meanwhile, the natural circulation of the liquid nitrogen was observed at flow rate of about 2 l/min, and the cable temperature remained low.