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.
The Performance of Joule Thomson Refrigerator
Cryocoolers 13 ; 497-502
2005-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
Mass Flow Rate , Cooling Capacity , Supply Pressure , Flow Control Mechanism , Exhaust Pressure Physics , Extraterrestrial Physics, Space Sciences , Strongly Correlated Systems, Superconductivity , Optics, Optoelectronics, Plasmonics and Optical Devices , Imaging / Radiology , Automotive Engineering
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