Design of small turbo brayton cycle air refrigerator test rig

In order to promote the development of cryocooler in China, the study of reverse turbo brayton cycle cryocooler was firstly begun in 1994 by Xi'an Jiaotong University. This paper introduces the reverse turbo brayton cycle refrigerator test rig established in 2002. The refrigerator adopts air as refrigerant medium and works in single stage, open cycle. The mechanical and thermodynamic performance of the refrigerator was tested and analyzed in this paper. The rotation speed of turbo expander has reached 230,000 rpm. The temperature in cold box can reach below 200 K and the temperature drop in the refrigerator has exceeded 80 K.