Experimental investigation of the heat transfer of supercritical R134a in a horizontal micro-fin tube

Wang, Dabiao; Dai, Xiaoye; Tian, Ruifeng; Shi, Lin

doi:10.1016/j.ijthermalsci.2019.01.013

Cited by 15 publications

(4 citation statements)

References 36 publications

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“…The threshold value of this criterion differed for the two different tubes, with the one for the micro-fin tube being a factor 20 larger than the one for the smooth tube, indicating that buoyancy is greatly suppressed in the micro-fin tube. Wang et al [72] also published a study solely focusing on the micro-fin tube, under the same measurement conditions. Heat flux effect was not straightforward, and depended on the bulk enthalpy.…”

Section: Heating Of Horizontal Flowmentioning

confidence: 99%

Current status of the thermohydraulic behavior of supercritical refrigerants: A review

Nieuwenhuyse

Lecompte

Paepe

2023

Applied Thermal Engineering

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Section: Heating Of Horizontal Flowmentioning

confidence: 99%

Current status of the thermohydraulic behavior of supercritical refrigerants: A review

Nieuwenhuyse

Lecompte

Paepe

2023

Applied Thermal Engineering

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“…Finally, Wang et al [40] have made a different investigation, developing a prototype that helped them evaluate the heat transfer of supercritical R134a in a horizontal micro-fin tube, for conditions related to the supercritical heater in transcritical ORC systems. The experimental facility consists of a main circulating loop, including a circulating pump, a mass flowmeter and a U type preheater.…”

Section: Various Layoutsmentioning

confidence: 99%

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

et al. 2019

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Supercritical operation is considered a main technique to achieve higher cycle efficiency in various thermodynamic systems. The present paper is a review of experimental investigations on supercritical operation considering both heat-to-upgraded heat and heat-to-power systems. Experimental works are reported and subsequently analyzed. Main findings can be summarized as: steam Rankine cycles does not show much studies in the literature, transcritical organic Rankine cycles are intensely investigated and few plants are already online, carbon dioxide is considered as a promising fluid for closed Brayton and Rankine cycles but its unique properties call for a new thinking in designing cycle components. Transcritical heat pumps are extensively used in domestic and industrial applications, but supercritical heat pumps with a working fluid other than CO2 are scarce. To increase the adoption rate of supercritical thermodynamic systems further research is needed on the heat transfer behavior and the optimal design of compressors and expanders with special attention to the mechanical integrity.

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“…Depending on the specific system configuration, heat exchangers can account for 20-70% of the cost in supercritical systems [3,4]. In numerous commercial T-ORC systems, heat exchangers are primarily configured for horizontal flow [5]. Nonetheless, in horizontal flow configurations, supercritical fluids are susceptible to encountering heat transfer deterioration, resulting in local increases in wall temperature and potential thermal decomposition of the organic fluid.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

Yang,

Tang,

2024

Energies

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This work numerically studied the heat transfer and flow characteristics of supercritical R134a in horizontal pipes equipped with DDIR, considering variations in the rotation angle of DDIR. The aim is to improve the effects of the DDIR configuration on the heat transfer of supercritical flow. After validation with experimental data, the AKN model was employed to examine the effects of four sets of rotation angles (0°, 30°, 45°, and 60°) on the axial and circumferential heat transfer characteristics of DDIR horizontal tubes under the influence of strong (q1/G1 = 0.1 kJ/kg) and medium (q2/G2 = 0.056 kJ/kg) buoyancy. Results show that variations in the rotation angle do not induce significant alterations in the flow field, thus exerting minimal influence on the axial heat transfer characteristics. Meanwhile, the rotation angle determines the relative positioning of the circumferential inner wall temperatures and heat flux distribution, although the magnitude of this effect remains inconspicuous. The rotational angle parameter can be reasonably neglected in the future design and installation of heat exchangers.

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Experimental investigation of the heat transfer of supercritical R134a in a horizontal micro-fin tube

Cited by 15 publications

References 36 publications

Current status of the thermohydraulic behavior of supercritical refrigerants: A review

Current status of the thermohydraulic behavior of supercritical refrigerants: A review

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

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