Two stage Gifford-McMahon cycle cryorefrigerator operated by gas balancing principle

✍ Scribed by M. Thirumaleshwar; R.M. Pandey

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 375 KB
• Volume: 30
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(90)90253-9

✦ Synopsis

This paper describes a two stage Gifford-McMahon cycle cryorefrigerator operating on the gas balancing principle. Here, the cryorefrigerator is driven by a valve mechanism consisting of two spool valves operating at a suitable phase sequence with respect to each other. The valve mechanism is driven by a motor and the cryorefrigerator is connected to the valve mechanism by flexible gas lines. This has the following advantages: flexibility of locating the cryorefrigerator at a distance from the compressor module and valve mechanism, access to narrow gaps in some experimental set-ups, minimum vibration, etc. Refrigeration of ~2.6 W is obtained at a temperature of 30 K when the speed of operation is 75 rev min-1 Pressure-volume (P-V) diagrams are drawn for various temperatures, showing clearly the degradation of such P-V curves as the temperature falls. A heat balance analysis is made, showing the contribution of each loss quantitatively.