Thermal management system of vapor compression for downhole instrument

IF 1.6 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Thermal Science and Engineering Applications Pub Date : 2023-05-16 DOI:10.1115/1.4062555

Qiuyang Tao, Minghui Wei, Hongjun Chen, Aihua Deng, Yilin He

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Abstract

As the depth of oil and gas exploration increases, downhole electronics face the threat of high temperature failure. At present, passive cooling technology has the problem of short working time, while active cooling technology has low energy utilization. This paper presents a thermal management system of vapor compression with a combination of active and passive cooling. The system uses insulation materials to isolate the high-temperature environment, thermally conductive silicone grease to strengthen the heat exchange in the evaporator, and vapor compression refrigeration cycles to absorb internal heat.The coefficient of performance (COP), exergy destruction and exergy efficiency of octane, nonane and cyclohexane as refrigerants were examined, and the effects of different insulation materials on refrigeration performance were studied from both theoretical and numerical perspectives. The results showed that cyclohexane exhibited the best cooling capacity with a COP of 1.296 and a exergy efficiency of 49.21%. The thermal management system cooling performance is optimal when the insulation material is a vacuum flask, with an effective cooling capacity of 121.7W.

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井下仪表蒸汽压缩热管理系统

随着油气勘探深度的增加，井下电子设备面临着高温失效的威胁。目前，被动冷却技术存在工作时间短的问题，而主动冷却技术存在能量利用率低的问题。本文介绍了一种蒸汽压缩热管理系统，该系统采用主动和被动冷却相结合的方式。系统采用保温材料隔离高温环境，导热硅脂加强蒸发器内的热交换，蒸汽压缩制冷循环吸收内部热量。考察了辛烷、壬烷和环己烷作为制冷剂的性能系数(COP)、火用破坏和火用效率，并从理论和数值两方面研究了不同保温材料对制冷性能的影响。结果表明，环己烷制冷性能最佳，COP为1.296，火用效率为49.21%。保温材料为保温瓶时，热管理系统冷却性能最佳，有效制冷量为121.7W。

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来源期刊

Journal of Thermal Science and Engineering Applications THERMODYNAMICSENGINEERING, MECHANICAL -ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

9.50%

发文量

120

期刊介绍： Applications in: Aerospace systems; Gas turbines; Biotechnology; Defense systems; Electronic and photonic equipment; Energy systems; Manufacturing; Refrigeration and air conditioning; Homeland security systems; Micro- and nanoscale devices; Petrochemical processing; Medical systems; Energy efficiency; Sustainability; Solar systems; Combustion systems