Abstract Miniature Joule Thomson refrigerators have been widely used for the cooling of infrared detectors, cryosurgery, thermal cameras, missile homing heads, and guidance systems because they have a simple, compact structure and rapid cooldown characteristics. The purpose of the present study was to characterize the thermal performance of a commercial demand-flow miniature Joule Thomson refrigerator designed for cooling infrared detectors. It has an O.D. of 5 mm and has a bellows flow-control mechanism to provide temperature control. Experimental data have been gathered on cooldown characteristics, no-load temperature, and cooling capacity for different pressures of nitrogen (NBP 77.3 K) and argon (NBP 87.4 K) gas. The test refrigerator was installed into a dewar that has a vacuum connection and radiation shields to diminish the heat load through conduction and radiation heat transfer. In the experiments, a pressure regulator was used to adjust the high-pressure supply gas to a constant pressure. The presented results show that there exists a minimum supply pressure for getting the required coldend temperature, and higher supply pressure to the Joule Thomson refrigerator results in more rapid cooldown performance.


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    Title :

    The Performance of Joule Thomson Refrigerator


    Contributors:

    Published in:

    Publication date :

    2005-01-01


    Size :

    6 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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