Mechanism of thermal decomposition of HFO-1234ze(E) under supercritical fluid conditions

Gunawan, Ricky; Irriyanto, Miqdar Zulfikar; Cahyadi, Handi Setiadi; Irshad, Muhammad; Lim, Hyung-Taek; Choi, Bum-Seong; Kwak, Sang-Kyu; Myint, Aye Aye; Kim, Jae-Hoon

doi:10.1016/j.supflu.2020.104792

Cited by 16 publications

(3 citation statements)

References 33 publications

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“…Subsequently, these radicals will reacted with the HFO‐1234yf molecule and intermediates to form the dominant products CHF 3 , CF 4 , HF, and H 2 . The pyrolysis mechanism of HFO‐1234ze(E) was investigated by Gunawan et al 66 by using the DFT method in supercritical fluid conditions. The results indicated that the key molecule HF was produced and consumed many times during the entire process of the pyrolysis reactions, the main pyrolysis products of HFO‐1234ze(E) were C1‐C2 range HFOs and HFCs.…”

Section: Thermal Stability Investigationsmentioning

confidence: 99%

Thermal stability and pyrolysis mechanism of working fluids for organic Rankine cycle: A review

Huo

Xin

Wang

2022

Intl J of Energy Research

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Summary Organic Rankine cycle (ORC) is an effective method used to convert renewable energy and waste heat into electricity. The screening of working fluids is crucial to the design of the ORCs, and their thermal stability is a key factor for the selection of ORC working fluids. This review emphasized the thermal stability studies of ORC working fluids. We reviewed the research methods and thermal stability results of hydrocarbon, fluorine‐containing, and siloxane working fluids and analyzed the effects of working fluid pyrolysis on the performance and safety of ORCs. Compared with the previous articles, which only introduced the thermal stability studies of working fluids, this review also focused on the research methods and the status quo of the working fluid pyrolysis mechanism. The feasibility of the density functional theory method and the ReaxFF force field for the study of working fluid pyrolysis mechanism was demonstrated. Finally, the disadvantages of working fluid thermal stability and pyrolysis mechanism studies were analyzed, and the prospects in this field were also discussed.

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Section: Thermal Stability Investigationsmentioning

confidence: 99%

Thermal stability and pyrolysis mechanism of working fluids for organic Rankine cycle: A review

Huo

Xin

Wang

2022

Intl J of Energy Research

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“…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. This poses challenges to the safety [6] and stability of the supercritical system [7,8]. Consequently, enhancing convective heat transfer in horizontal tubes under supercritical conditions becomes a critical approach to improving the heat exchange capacity of the heat exchanger and optimizing the overall efficiency of T-ORC systems.…”

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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“…In addition, considering that various insulation defects introduced by manufacturing, production, operation and maintenance of GIE can induce PD and lead to gas decomposition, it is necessary to evaluate the discharge stability and decomposition characteristics of eco-friendly insulating gas [21,22]. As for HFO-1234ze(E) gas mixture, Gunawan et al pointed out that the decomposition of HFO-1234ze(E) produces pentafluoroethane (CHF 2 CF 3 ), 1,1,1-trifluoroethane (CH 3 CF 3 ), and 2,3,3,3-tetrafluoropropene (CH 2 CFCF 3 ) [23]. Lin et al further conducted the ReaxFF-MD simulation and indicated that the main particle by-products of HFO-1234ze(E) are C 2 F 2 , CN, CNF, H, N, F, and HN 2 [24].…”

Section: Introductionmentioning

confidence: 99%

Partial discharge induced decomposition and by-products generation properties of HFO-1234ze(E)/CO₂: a new eco-friendly gas insulating medium

Wang

Xiao

et al. 2023

J. Phys. D: Appl. Phys.

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HFO-1234ze(E) is introduced as a new eco-friendly gas insulating medium to substitute SF6 for medium-voltage gas insulated equipment (MV-GIE). However, there are few reports on the partial discharge (PD) induced decomposition and gaseous, solid by-products generation characteristics of HFO1234ze(E)/CO2. Herein, the PD decomposition characteristics of HFO1234ze(E)/CO2 were explored based on a needle-plate electrode that simulates the metal protrusion defect in MV-GIE. The PDIV, PRPD of HFO-1234ze(E)/CO2 under different mixing ratio, PD intensity and duration time were obtained. Meanwhile, the PD induced decomposition and generation of gaseous, solid by-products of HFO1234ze(E)/CO2 gas mixture were analyzed. A three-zone model that describes the gas-solid metal interface interaction was proposed for the first time. It is found that the increase of HFO1234ze(E) content brings superior insulation performance of the gas mixture, while the precipitation of gaseous (CF4, C2F6, CHF3, C3HF7) and solid by-products gradually aggravated. In order to avoid the negative impact of PD-induced decomposition on the insulation and service life of MV-GIE, the optimal HFO1234ze(E) content of 30% is recommended. This work provides guidance for the development of HFO1234ze(E) based MV-GIE and helps understand the solid by-products precipitation mechanism of eco-friendly gas insulating medium.

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Mechanism of thermal decomposition of HFO-1234ze(E) under supercritical fluid conditions

Cited by 16 publications

References 33 publications

Thermal stability and pyrolysis mechanism of working fluids for organic Rankine cycle: A review

Thermal stability and pyrolysis mechanism of working fluids for organic Rankine cycle: A review

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

Partial discharge induced decomposition and by-products generation properties of HFO-1234ze(E)/CO₂: a new eco-friendly gas insulating medium

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Mechanism of thermal decomposition of HFO-1234ze(E) under supercritical fluid conditions

Cited by 16 publications

References 33 publications

Thermal stability and pyrolysis mechanism of working fluids for organic Rankine cycle: A review

Thermal stability and pyrolysis mechanism of working fluids for organic Rankine cycle: A review

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

Partial discharge induced decomposition and by-products generation properties of HFO-1234ze(E)/CO2: a new eco-friendly gas insulating medium

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Product

Resources

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Partial discharge induced decomposition and by-products generation properties of HFO-1234ze(E)/CO₂: a new eco-friendly gas insulating medium