Abstract Performance of pulse tube cryocoolers working around 4 K region is affected by the fact that helium gas deviates from the ideal gaseous state. Previous experimental studies are mostly done in the working pressure region of 1 to 2 MPa, similar to the commercially available 4 K GM coolers. However, the non-ideal state of the helium gas near 4 K region suggests that use of lower working gas pressure should give a better performance. In order to verify this hypothesis, an experimental apparatus consisting of a single stage pulse tube cryocooler was fabricated and tested at different base pressures down to 1 atmosphere. A two-staged G-M cooler was used as the pre-cooler to keep the pre-cooling temperature constant Experimental results show that a significant increase of cooling performance can be obtained near the plateau temperature region on T-S diagram by decreasing the mean working gas pressure as anticipated.
Performance Dependence of 4K Pulse Tube Cryocooler on Working Pressure
Cryocoolers 10 ; 227-232
2002-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
Performance Dependence of a 4 K Pulse Tube Cryocooler on Working Pressure
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