Development of a compact cryocooler system for high temperature superconductor filter application. (December 2016)

• Record Type: Journal Article
• Authors: Pang, Xiaomin; Wang, Xiaotao; Zhu, Jian; Chen, Shuai; Hu, Jianying; Dai, Wei; Li, Haibing; Luo, Ercang
• Is Part Of: Cryogenics. Volume 80:Part 2(2016)
• Page Start: 238
• Page End: 242
• Publication Date: 2016-12
• Subjects: Thermoacoustic theory -- Co-axial pulse tube cryocooler -- Power density -- High frequency; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2016.06.004
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: A high efficiency co-axial pulse tube cryocooler operating at around 100 Hz is introduced. The whole system weighs 4.3 kg with a nominal input power of 320 W, namely, power density of the system is around 74 W/kg. The co-axial pulse tube cooler has a relative Carnot efficiency of 15.5%. The influence of frequency is experimental studied. Abstract: Seeking a higher specific power of the pulse tube cryocooler is an important trend in recent studies. High frequency operation (100 Hz and higher), combined with co-axial configuration, serve as a good option to meet this requirement. This paper introduces a high efficiency co-axial pulse tube cryocooler operating at around 100 Hz. The whole system weighs 4.3 kg (not including the radiator) with a nominal input power of 320 W, namely, power density of the system is around 74 W/kg. The envelop dimensions of the cold finger itself is about 84 mm in length and 23 mm in outer diameter. Firstly, numerical model for designing the system and some simulation results are briefly introduced. Distributions of pressure wave, the phase difference between the pressure wave and the volume flow rate and different energy flow are presented for a better understanding of the system. After this, some of the characterizing experimental results are presented. At an optimum working point, the cooling power at 80 K reaches 16 W with an input electric power of 300 W, which leads to an efficiency of 15.5% of Carnot.