Abstract
The real performance of the compressor significantly affects the optimization results of a Joule-Thomson (JT) cryocooler working at liquid helium temperature. A compressor experimental setup has been built to measure an oil-free scroll-type compressor. The measured mass-flow rate decreases from 11.7 mg/s to 10.9 mg/s as the pressure ratio increases from 4.2 to 23.3. By fitting the processed measurement results, models of suction volume flow and exergetic efficiency of the compressor are obtained. It is shown that the suction volume flow and exergetic efficiency can be expressed as functions of the pressure ratio. Combining these models, a method to optimize the discharge pressure and precooling temperature for optimal coefficient of performance of the complete JT cryocooler is proposed. The effects of the real performance of the compressor on the optimal parameters of the JT cryocooler are presented with the calculation results.
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