Study on a pulse tube cryocooler using gas mixture as its working fluid

In order to improve the performance of a one-stage pulse tube cryocooler, g as mixtures are used for comparison, which have been used in other cryocool ers. A mixture of hydrogen and helium was investigated in this study. When the structure of the pulse tube is the same as mentioned in [C. Wang, P.Y. Wu, Zh.Q. Chen, Numerical modeling of an orifice pulse tube cryocooler, Cry ogenics 32 (1992) 785] and the working conditions are: frequency 15 Hz, ave rage pressure 1.1 MPa, hot end temperature: 300 K and cold end temperature 80 K, it has been found that there are optimal molar percentage for the max imal cooling power and the maximal-coefficient of performance (COP) of this cryocooler. (C) 2001 Elsevier Science Ltd. All rights reserved.