Abstract
The study on the cooling capacity characteristics of the helium Joule-Thomson cryocooler (JTC) is important for its efficient operation in space applications. However, key parameters regarding the cooling capacity characteristics of helium JTC have yet to be comprehensively studied. A mathematical model is established in this work to reveal the cooling capacity characteristic of the JTC. The accuracy of the model is validated against an experimental study. Based on the mathematical model, a method is proposed to calculate the actual cooling capacity of the JTC accurately. A parametric study is then carried out, where the effect of secondary precooling temperature, high-pressure and the length of CFHX3 on the cooling capacity characteristics of the JTC are analyzed. The results show that there exists an optimal secondary precooling temperature and an optimal high-pressure under which the helium JTC can obtain the maximum cooling capacity. And the reason for the difference between the actual cooling capacity and the ideal cooling capacity is analyzed in this paper. This work reveals the basic mechanism of how the key operating parameters affected the cooling capacity of helium JTC, which is expected to provide a theoretical basis for performance optimization of helium JTC and promote the space application of helium JTC.
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