Transient cooling and operational performance of the cryogenic part in reverse Brayton air refrigerator

Yang, Shanju; Bao, Futing; Hou, Yu; Chen, Shuangtao; Li, Zhiguo; Wang, Shaojin

doi:10.1016/j.energy.2018.11.016

Cited by 21 publications

(26 citation statements)

References 25 publications

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“…The cold box includes the cryogenic heat exchanger, pipes, and a cold load (an electric heater). While in the present study, the refrigerator was free-load, and the refrigerator performance is evaluated using the ultimate temperature [6]. Due to advantages of compactness, light weight, high efficiency, small flow loss, the plate-fin heat exchanger is commonly applied in cryogenic refrigerators.…”

Section: The Air Refrigeratormentioning

confidence: 99%

“…According to the structure and heat transfer features of the plate-fin heat exchanger, some assumptions were introduced for solving the problem easily [6,11]. There was a one-dimensional flow, and the distributions of fluid were even among channels.…”

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

“…With numerical methods of flow and heat transfer, a transient simulation method of the plate-fin heat exchanger was newly proposed [6]. In the model, influences of the cold loss, axial conduction, and thermal capacity were all considered.…”

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

“…The convective heat transfer coefficient and pressure loss in the heat exchanger can be calculated as [6]:…”

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

“…The cryogenic heat exchanger is a very important equipment in low temperature equipment. It not only affects the economy of the cryogenic equipment, but also affects the possibility of process realization [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Frost Growth and Migration in Cryogenic Heat Exchanger on Air Refrigerator

et al. 2019

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Frost formation degrades the performance of heat exchangers greatly, thus influencing the cryogenic refrigerator. Different from frost formation on the evaporator surface, the growth and migration of frost layer inside the heat exchanger is of low temperature and humidity. In addition to the constantly changing boundary conditions, the effective prediction is difficult. In the present study, a numerical model was proposed to analyze the frost formation in the cryogenic heat exchanger of a reverse Brayton air refrigerator. Under small amounts of moisture, the growing of frost layer was simulated through the numerical heat and mass transfer by adopting semiempirical correlations. The frost formation model was inserted into the transient model of refrigerator, and numerical calculations were performed on heat and mass transfer rates, and growth and migration of frost layers in forced convection conditions. Experiments were conducted under different air humidity to investigate the frost formation and verify the numerical model. Through the model, the influences of frosting on the refrigerator were evaluated under different moisture contents and running time. It can be used to predict the performance of air refrigerators with low humidity and provide a basis for improving the system operation and efficiency.

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Section: The Air Refrigeratormentioning

confidence: 99%

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

“…The convective heat transfer coefficient and pressure loss in the heat exchanger can be calculated as [6]:…”

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Frost Growth and Migration in Cryogenic Heat Exchanger on Air Refrigerator

et al. 2019

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Experimental and numerical analysis to predict the performance of a turboexpander at cryogenic temperature

Kumar

Biswal

Behera

et al. 2020

Engineering Reports

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The emerging trend for using cryogenic fluids in scientific and research applications requires a Claude cycle‐based efficient turboexpander system. This paper presents the mean‐line design procedure, numerical, and experimental investigation to distinguish the fluid flow and thermodynamic analysis of a turboexpander operating at cryogenic temperature. Initially, the mean‐line design of turboexpander components has been carried out. Thereafter, the three‐dimensional model and computational mesh of nozzle, turbine, and diffuser have been generated using ANSYS BladeGen® and ICEM®. The three‐dimensional computational fluid dynamics analysis has been carried out to characterize the effect of fluid flow properties such as pressure, velocity, and thermal properties such as temperature, static enthalpy, and entropy at different axial locations. Finally, an experimental test rig has been developed to examine the performance of the turboexpander at cryogenic temperature and validating the numerical findings for a case study. The methodology provides insight into the realistic fluid flow phenomenon and thermal performance of a turboexpander under rotating conditions, as it is the most essential and expensive part of a gas liquefaction system.

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Characteristics of frictional pressure drop of two-phase nitrogen flow in horizontal smooth mini channels in diabatic/adiabatic conditions

Chen

Hou

Chen

et al. 2019

Applied Thermal Engineering

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Transient cooling and operational performance of the cryogenic part in reverse Brayton air refrigerator

Cited by 21 publications

References 25 publications

Influence of Frost Growth and Migration in Cryogenic Heat Exchanger on Air Refrigerator

Influence of Frost Growth and Migration in Cryogenic Heat Exchanger on Air Refrigerator

Experimental and numerical analysis to predict the performance of a turboexpander at cryogenic temperature

Characteristics of frictional pressure drop of two-phase nitrogen flow in horizontal smooth mini channels in diabatic/adiabatic conditions

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