A 70 K J-T cryocooler based on the fractional mixed-refrigerant cycle

摘要

An effort was made in this paper to reach about 65 to 70 K temperature range by using a mixed-gases Joule-Thomson system. A special cycle configuration was disclosed utilizing a new developed fractional phase-separator with inner heat and mass transfer. This separator avoids cold clogging essentially. An optimal mixture was used to improve the system performance. A stable coldest temperature of 65 K and a cooling capacity of 1.06 W at 70 K were achieved driven by a commercial single-stage hermetic compressor with a nominal input power of 500 W. The detailed analysis of mixture properties and cycle configuration are also presented in this paper.