Impact of external heat transfer on the performance of a cold compressor used in superfluid helium system

Dong, Xinbo; Wu, Jianfeng; Li, Junjie; Xu, Xiaodong; Su, He; Shang, Jin-Ming; Li, Qing; Gong, Linghui

doi:10.1016/j.cryogenics.2020.103141

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…When a cold compressor is operating, the temperature of the stator and rotor centre of the motor at the ambient end can exceed 340 K, and the low temperature end of the impeller inlet can be as low as 3 K. The huge temperature difference then causes heat leakage from the high temperature end to the low temperature section. External heat inleak will cause the compressor to operate with reduced compression efficiency during the compression process [2] and will lead to an increase in the outlet temperature, affecting the subsequent compressor inlet conditions. IHI (Ishikawajima-Harima Heavy Industries) conducted tests on cold compressors they designed and found that every 20 W of heat leakage would cause a 1% reduction in efficiency [3].…”

Section: Introductionmentioning

confidence: 99%

Simulation and analysis on heat leakage structure of cold compressor in large-scale refrigeration system

Chen,

Shang,

Wang

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Large-scale helium cryogenic refrigeration facilities are indispensable equipment for many cutting-edge researches, and the cold compressor is the most advantageous pressurization scheme in superfluid helium systems with capacity of more than 200 watts. Due to the extremely low operating temperature zone of the cold compressor, the efficiency of the compression process decreases as the external heat leakage increases, especially when building systems with greater cooling capacity, this phenomenon becomes more significant. In order to reduce the influence of heat leakage, a conjugate heat transfer analysis is carried out on the cold compressor using commercial CFD software, and the internal structures, including thermal anchor, thermal insulation materials, are analysed and optimized base on the simulations.

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Section: Introductionmentioning

confidence: 99%

Simulation and analysis on heat leakage structure of cold compressor in large-scale refrigeration system

Chen,

Shang,

Wang

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Therefore, finding an efficient heat pump air conditioning system has become a research hotspot for many scholars. Research has pointed out that a large proportion of the total energy loss of heat pump air conditioning systems is caused by throttling elements [1][2][3]. The COP (coefficient of performance) of the heat pump system is increased from 2.9 to 3.1 only by optimizing the control strategy of throttling components [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Validation of the Flow-Induced Excitation Characteristics of a Four-Way Reversing Valve

Zhang

Yuan³

et al. 2023

Processes

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In order to improve the low efficiency and malfunction caused by the FWRV (four-way reversing valve) when the working mode of the heat pump air conditioning system changes in refrigeration and heating, it is of great significance to study the structure of the FWRV. In this paper, the control equation of the sliding block movement process is constructed to simulate the reversing process of the FWRV in fluid mechanics, and a detailed study is carried out from the sliding block speed, sliding block acceleration, sliding block force, refrigerant leakage, and other aspects. Some studies indicate that structural improvement in the slider could greatly enhance the working performance of the FWRV. Increasing the height of the slider not only improves the pressure relief ability of the FWRV and prevents the slider from being damaged by high-pressure gas impact but also reduces the leakage of refrigerant during the directional process; when reducing the length of the slider, although it improves the pressure relief capacity of the FWRV, it also increases the amount of refrigerant leakage. The research results provide a theoretical basis and direction for designers to improve the capability of the FWRV.

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“…Therefore, finding an efficient heat pump air conditioning system has become a research hotspot for many scholars. Research has pointed out that a large proportion of the total energy loss of heat pump air conditioning systems is caused by throttling elements [1][2][3]. The COP of the heat pump system is increased from 2.9 to 3.1 only by optimizing the control strategy of throttling components [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Flow-Induced Excitation Characteristics of a Four Way Reversing Valve

Zhang¹,

Wu²,

Yuan³

et al. 2023

Preprint

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The four-way reversing valve is a key component determining whether a heat pump air conditioning system can work. Studying the four-way reversing valve is of great significance for improving the performance of the heat pump air conditioning system. In this paper, the control equation of the sliding block movement process is constructed to simulate the reversing process of the four-way reversing valve in fluid mechanics, and a detailed study is carried out from the sliding block speed, sliding block acceleration, sliding block force, refrigerant leakage, and other aspects. Research has shown that optimizing the structure of the slider can greatly improve the working performance of the four-way reversing valve. Increasing the height of the slider not only improves the pressure relief ability of the four-way reversing valve and prevents the slider from being damaged by high-pressure gas impact, but also reduces the leakage of refrigerant during the directional process; When reducing the length of the slider, although it will improve the pressure relief capacity of the four-way reversing valve, it also increases the amount of refrigerant leakage. The research results provide a theoretical basis and improvement direction for designers to improve the performance of four-way reversing valves.

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Impact of external heat transfer on the performance of a cold compressor used in superfluid helium system

Cited by 7 publications

References 16 publications

Simulation and analysis on heat leakage structure of cold compressor in large-scale refrigeration system

Simulation and analysis on heat leakage structure of cold compressor in large-scale refrigeration system

Numerical Simulation and Experimental Validation of the Flow-Induced Excitation Characteristics of a Four-Way Reversing Valve

Research on Flow-Induced Excitation Characteristics of a Four Way Reversing Valve

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