Numerical Study of a New Type of 4 K GM/PT Hybrid Refrigerator
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A new type of hybrid refrigerator operating in the liquid helium temperature region has been proposed. The warm stage of this refrigerator is a typical G-M refrigeration cycle, on which the cold stage of a pulse tube cooler is coupled thermodynamically. The phase shift structures for the pulse tube are supported at the temperature of the G-M refrigeration stage. There are several methods that can be applied as the phase shifter for the pulse tube; for example, a cold piston that is connected to the displacer of the G-M refrigerator. Physical and mathematical models have been established to describe the unique thermophysical aspects of this type of refrigerator, and numerical methods have been employed to solve the theoretical models. Through the calculations, some helpful results have been obtained, and the structure of the refrigerator has been optimized. Experimental evaluation is now underway.
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