Abstract
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.
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