Optimization of the intermediate precooling temperatures for the 2 K hybrid cryocooler based on entropy generation analysis

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-02-20 DOI:10.1016/j.csite.2025.105887

Bangjian Zhao , Shihang Ding , Lixi Lu , Zhen Yang , Guoliang Tang , Shijie Liu , Chunlai Li , Guangjun Dong , Jianyu Wang

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引用次数: 0

Abstract

There is an increasing demand for 2 K hybrid cryocoolers, consisting of a multi-stage Stirling-type pulse tube cryocooler (SPTC) coupled with a Joule-Thomson cooler (JTC), due to their critical applications in deep space exploration and quantum information technology. Precooling temperature and the number of precooling stages, as the key parameters of hybrid cryocoolers, are crucial for attaining 2 K cooling performance. In this paper, an entropy model of the JT cryocooler at 2 K temperature is established for the first time. Based on this model, three-stage precooling temperatures under various operating conditions are optimized, minimizing entropy generation and enhancing the energy utilization efficiency of the JTC cycle in the hybrid cryocooler. Results indicate that there is an optimal value for the first stage precooling temperature (T_pre.1) of 105 K, and the second-stage precooling temperature (T_pre.2) should be minimized. The third stage precooling temperature (T_pre.3) varies with the first two stages and is uniquely determined. Increasing precooling stages from two to three cuts entropy generation by about 15.12 %. These findings offer a key theoretical basis for optimizing hybrid cryocooler design and improving its efficiency and performance.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.