Mechanical and Mechanics Engineering |
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Design and preliminary experimental investigation of a 4 K Stirling-type pulse tube cryocooler with precooling |
Zhi-hua GAN, Zhuo-pei LI, Jie CHEN, Li DAI, Li-min QIU |
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China |
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Abstract A Stirling-type pulse tube cryocooler (PTC) with precooling was designed and manufactured to investigate its performance at 4 K. Numerical simulation was carried out based on the well-known regenerator model REGEN with an emphasis on the performance of a 4 K stage regenerator of the Stirling-type PTC as influenced by the warm end temperature, pressure ratio, frequency and average pressure with helium-4 and helium-3 as the working fluid respectively. This study demonstrates that the use of a cold inertance tube can significantly improve the efficiency of a 4 K Stirling-type PTC. A preliminary experimental investigation was carried out with helium-4 as the working fluid and a refrigeration temperature of 4.23 K was achieved. The experimental results show that the operating frequency has a significant influence on the performance of the Stirling-type PTC and a relatively low average pressure is favorable for decreasing the loss associated with the real gas effects of a 4 K Stirling-type PTC.
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Received: 14 February 2009
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