Abstract A pulse tube cryocooler (refrigerator) has no moving parts in its cold section, and, when driven by a linear compressor, has the potential of achieving higher reliability and lower vibration than other small refrigerators. The most compact and convenient pulse tube cryocooler for practical applications is the coaxial type. It can often replace Stirling cryocoolers without any change to the dewar or to the connection to the cooled device. The purpose of this study is to analyze the characteristics of a coaxial type inertance pulse tube refrigerator (IPTR), and to understand the principal factors governing its performance. The key components of a coaxial-type IPTR include a linear compressor with two reciprocating pistons driven by linear motors, a regenerator, a pulse tube with its inertance tube, and a buffer (reservoir) volume. To ensure high performance of the coaxial-type IPTR, the design and operating parameters of the linear compressor and expander must be optimized. Experimental results show that the operating frequency has a significant effect on a linear compressor’s input power characteristics, and with a higher charge pressure of the working fluid, a higher pressure ratio can be achieved. To find optimal conditions of the coaxial type IPTR, the no-load temperature has been measured for various inertance tube volumes, operating frequencies, and charge pressures. In addition, cooldown and load characteristics have been determined.
A Study of Performance Improvement of the Coaxial Inertance Tube Pulse Tube Cryocooler
Cryocoolers 13 ; 261-266
2005-01-01
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Operating Frequency , Pulse Tube , Charge Pressure , Linear Compressor , Pulse Tube Refrigerator Physics , Extraterrestrial Physics, Space Sciences , Strongly Correlated Systems, Superconductivity , Optics, Optoelectronics, Plasmonics and Optical Devices , Imaging / Radiology , Automotive Engineering
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