Thermal analysis of supercritical pressure CO 2 in horizontal tubes under cooling condition

Xiang, Mengru; Guo, Jiangfeng; Huai, Xiulan; Cui, Xinying

doi:10.1016/j.supflu.2017.04.009

Cited by 104 publications

(16 citation statements)

References 33 publications

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“…Liu and Xu [32] compared nine turbulence models with experimental results of sCO 2 passing through helical tube and suggested the Shear Stress Transport model for best prediction to heat transfer characteristics. The comparisons of various turbulent models were performed in previous research works for different supercritical fluids including sCO 2 [32][33][34][35][36], supercritical water [37][38][39][40][41][42], supercritical methane [43], supercritical nitrogen [44], supercritical fluid R134a [31,45,46] and supercritical fluid R1234ze (E) [1]. These findings suggested good agreement between simulations (performed by SST k-ω model) and experimental data.…”

Section: Introductionsupporting

confidence: 54%

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Ibrahim¹,

Hu²,

Jiang³

et al. 2021

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The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternative to replace conventional R134a, which can be beneficial for climate change. A considerable suggestion is R515A which possesses considerably lower global warming potential. The present simulations are designed to study supercritical fluid R515A under cooling conditions in horizontal position. The effect of pressure, mass flux, heat flux and tube diameter were considered for horizontal tube in the vicinity of pseudo critical temperature. Numerical investigations on heat transfer characteristics of supercritical fluid R515A were performed using widely used shear-stress transport (SST) model. Moreover, heat transfer correlations were developed and suggested to accurately predict Nusselt number within 10% accuracy. The simulation results showed about 3.98% average absolute deviation.

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Section: Introductionsupporting

confidence: 54%

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Ibrahim¹,

Hu²,

Jiang³

et al. 2021

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“…Luo et al made a study of the thermal behaviors of supercritical CO 2 in the serpentine tube . Xiang et al discussed the thermal characteristics of supercritical CO 2 at different tube diameters using ANSYS CFX . The numerical simulations of the thermal behaviors of supercritical CO 2 in the tube may not merely reduce cost.…”

Section: Introductionmentioning

confidence: 82%

“…Accordingly, supercritical CO 2 is used as a novel refrigerant in mobile air‐conditioners and geothermal heat pumps. The thermal behaviors of supercritical CO 2 in the tube have been widely investigated experimentally and numerically …”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Wang

Dong

Xue

et al. 2019

Asia-Pacific J Chem Eng

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To further improve the thermal efficiency of the coal-fired boiler, lower environment restraints, and minimize key components, the supercritical CO 2 Brayton cycle was considered to replace the conventional steam Rankine cycle.In this paper, a three-dimensional mathematical model of the thermal behaviors between the supercritical CO 2 tube and flue gas was established using the Lam-Bremhorst k-ε model, the gas real model, and the P-1 radiation model. The distributions of the velocity and the temperature between the supercritical CO 2 tube and flue gas were investigated numerically. Furthermore, the effects of the supercritical CO 2 inlet temperature on the thermal behaviors were also examined. The results show the surface heat transfer coefficient goes up with the supercritical CO 2 inlet temperature due to the rise of the thermal conductivity. More significant thermal behaviors and detailed physical explanations were elaborated, which would offer a novel insight to understand, design, and optimize the supercritical CO 2 Brayton cycle for engineering applications.

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“…The detailed mathematical model is described below [35]. The continuity equation is described as: International Journal of Clean Coal and Energy…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Investigations on Supercritical Heat Transfer Characteristics of Environmental Friendly Refrigerants

Ibrahim¹,

Hu²,

Jiang³

et al. 2021

IJCCE

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The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternatives to replace conventional R134a, which can be beneficial for climate change. Most of the experimental and numerical investigations have been conducted to explore supercritical water, carbon dioxide and R134a as heat transfer working fluids. Hydrofluoroolefin (HFO) and refrigerants blends have been considered the most environment-friendly refrigerants to replace Chlorofluorocarbons (CFCs), Hydrochlorofluoro-carbons (HCFCs) and Hydrofluorocarbons (HFCs). Their main advantage of zero Ozone Depletion Potential (ODP) and comparatively lower Global Warming Potential (GWP) have attracted growing amount of attention to mitigate environmental issues. This work adopts the computational method and takes the environmentally friendly refrigerants to investigate the heat transfer characteristics under widely used shear-stress transport (SST) model. A comprehensive comparison was performed at reduced pressure of 1.10 for supercritical fluids R515A, R1234ze(E) and R134a. The peaks of heat transfer coefficient occurred in the vicinity of pseudo critical temperature for all of these considered fluids; however, R134a resulted in higher heat transfer coefficient, Reynolds number and Prandtl number in comparison with R515A and R1234ze(E). The higher heat transfer coefficient of supercritical fluid R134a is owing to its thermophysical properties and the specific heat plays crucial role in the heat transfer of supercritical fluids. Owing to environmental issues, R515A can be a considerable replacement of R134a. R1234ze(E) is also promising alternative to R134a; however, safety issues should thoroughly concern its mild flammable characteristics.

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Thermal analysis of supercritical pressure CO 2 in horizontal tubes under cooling condition

Cited by 104 publications

References 33 publications

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Numerical Investigations on Supercritical Heat Transfer Characteristics of Environmental Friendly Refrigerants

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Thermal analysis of supercritical pressure CO 2 in horizontal tubes under cooling condition

Cited by 104 publications

References 33 publications

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Numerical simulation of flow and heat transfer between supercritical CO2 tube and flue gas

Numerical Investigations on Supercritical Heat Transfer Characteristics of Environmental Friendly Refrigerants

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Product

Resources

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Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas