Valve timing effect on the cooling performance of a 4 K pulse tube cooler |
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Authors: | LM Qiu G Thummes |
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Affiliation: | a Institute of Applied Physics, University of Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany b Cryogenics Lab, Zhejiang University, Hangzhou 310027, China |
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Abstract: | Generally, a compressor together with a rotary valve system generates the pressure oscillation in GM-type cryocoolers. The timing of the rotary valve, which is one of the key operating parameters for cryocoolers, determines the relationship between intake and exhaust processes. A systematic investigation of valve timing effects on cooling performance of a two-stage 4 K pulse tube cooler (PTC) is reported. The experiments show that the optimization of valve timing can considerably improve the cooling performance for both stages. For the same PTC, a performance comparison for operation on different compressors with various input powers ranging from 0.5 to 6.0 kW is also presented. |
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Keywords: | Pulse tube (E) Liquid helium (B) Valve timing |
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