百安级变截面珀尔帖电流引线漏热分析
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摘要
横跨低温到室温温区的电流引线是连接电源和超导装置的部件,是超导装置的主要漏热源之一.因此减小由于电流引线导致超导低温系统的漏热对低温系统的稳定运行和运行效率至关重要.在传统铜电流引线的室温端插入热电材料碲化铋(Bi_2Te_3)形成的珀尔帖电流引线(Peltier current lead,以下简称PCL)可以有效地减小由于电流引线造成的漏热.珀尔帖电流引线将漏热从纯铜引线的42.4W/kA降低到30.470W/kA.在本文中采用有限元法对PCL进行优化,得到PCL的最优几何参数.改变PCL中铜引线和热电材料碲化铋的横截面面积,并计算改变横截面面积时PCL的漏热.仿真结果显示改变PCL中铜引线的横截面面积时对电流引线的漏热影响不大,而在改变PCL中热电材料的横截面,可以将PCL的漏热从30.470 W/kA降低到27.36 W/kA.
The current lead,which connects power supply in room temperature and superconducting device in cryogen,is the main source of heat leakage for superconducting device.Therefore,reducing the heat leakage of superconducting cryogenic system caused by current lead is critical to the stable operation and cost of cryogenic systems.The Peltier current lead(PCL),inserting a thermoelectric material Bi_2Te_3 in the room temperature end of conventional copper lead,can effectively reduce the heat leakage caused by current lead.The PCL reduces heat leakage from the copper lead 42.4 W/kA to 30.470 W/kA.In this paper,the PCL is optimized using the finite element method to obtain the optimal geometric parameters of the PCL.The cross section area of and thermoelectric material Bi_2Te_3 and copper lead in PCL were changed,and calculating the heat leakage of PCL with changing the cross section.The simulation results show that changing the cross-sectional area of the copper lead in the PCL has little effect on the heat leakage of the current lead.When the cross-sectional area of the thermoelectric material Bi_2Te_3 in the PCL is changed,the heat leakage of PCL can be reduced from 30.470 W/kA to 27.36 W/kA.
The current lead,which connects power supply in room temperature and superconducting device in cryogen,is the main source of heat leakage for superconducting device.Therefore,reducing the heat leakage of superconducting cryogenic system caused by current lead is critical to the stable operation and cost of cryogenic systems.The Peltier current lead(PCL),inserting a thermoelectric material Bi_2Te_3 in the room temperature end of conventional copper lead,can effectively reduce the heat leakage caused by current lead.The PCL reduces heat leakage from the copper lead 42.4 W/kA to 30.470 W/kA.In this paper,the PCL is optimized using the finite element method to obtain the optimal geometric parameters of the PCL.The cross section area of and thermoelectric material Bi_2Te_3 and copper lead in PCL were changed,and calculating the heat leakage of PCL with changing the cross section.The simulation results show that changing the cross-sectional area of the copper lead in the PCL has little effect on the heat leakage of the current lead.When the cross-sectional area of the thermoelectric material Bi_2Te_3 in the PCL is changed,the heat leakage of PCL can be reduced from 30.470 W/kA to 27.36 W/kA.
引文
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[2]Sato,K.,Okumura,H.,Yamaguchi,S.Proceedings of 20th International Conference on Thermoelectrics,2001:491.
[3]Xuan,X.C.,Ng,K.C.,Yap,C.,Chua,H.T.Cryogenics,42(2002),141.
[4]E.S.Jeong,Cryogenics,45(2005),516.
[5]Maehata,K.,Ishibashi,K.,Wakuta,Y..Cryogenics,34(1994),935.
[6]Hasegawa,Y.,Sato,K.,Okumura,H.,et al.Cryogenics,42(2002),495.
[7]W.Seifert,M.Ueltzen,and E.Müller,Physica Status Solidi.C,194(2002),277.