Thermal effects of planar high temperature heat pipes in solid oxide cell stacks operated with internal methane reforming

Dillig, M.; Plankenbühler, Thomas; Karl, Jürgen

doi:10.1016/j.jpowsour.2017.11.007

Cited by 47 publications

(6 citation statements)

References 30 publications

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“…It was found that with the help of high thermal conductivity induced by the evaporation-transport-condensation process in liquid sodium, the axial temperature gradient was significantly decreased, enhancing the cell electrochemical performance and life span. Dillig et al [16] and Marocco et al [25] have drawn similar conclusions in their simulation investigations. Recently, Promsen et al [26] proposed a novel concept of SOFC cooled by saturated water.…”

Section: Introductionsupporting

confidence: 65%

“…Therefore, simply accelerating the convective flow in the air channel is not the most effective strategy to control temperature and temperature gradient within the safe region. Besides, an additional air flow normally increases the cost [59] since, reportedly, over 10% of the total cell electricity generation will be consumed by the air blower devices [16,21,61]. Therefore, the air flow rate must be carefully controlled considering material deterioration, structural integrity, and cell efficiency.…”

Section: Effects Of Air Flow Ratementioning

confidence: 99%

“…The internal reforming process provides SOFCs with an efficient and sustainable operation since the thermal coupling of endothermic reforming and exothermic processes can improve the cell efficiency [15], and the integration of renewable fuel productions with direct hydrocarbon or alcohol SOFCs is promising in achieving carbon-neutral power generation. Moreover, given the considerable amount of waste heat produced due to cell inefficiency, accounting for 20-50% LHV (Lower heating value) of fuels [16], exhausted gases could be further used for bottoming cycles to generate extra power, maximizing overall system efficiency [17,18]. However, despite the numerous benefits involved in the SOFC system, thermal management has been a major challenge [19].…”

Section: Introductionmentioning

confidence: 99%

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Temperature Gradient Analyses of a Tubular Solid Oxide Fuel Cell Fueled by Methanol

Guo

Xia

et al. 2022

Trans. Tianjin Univ.

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Thermal management in solid oxide fuel cells (SOFC) is a critical issue due to non-uniform electrochemical reactions and convective flows within the cells. Therefore, a 2D mathematical model is established herein to investigate the thermal responses of a tubular methanol-fueled SOFC. Results show that unlike the low-temperature condition of 873 K, where the peak temperature gradient occurs at the cell center, it appears near the fuel inlet at 1073 K because of the rapid temperature rise induced by the elevated current density. Despite the large heat convection capacity, excessive air could not effectively eliminate the harmful temperature gradient caused by the large current density. Thus, optimal control of the current density by properly selecting the operating potential could generate a local thermal neutral state. Interestingly, the maximum axial temperature gradient could be reduced by about 18% at 973 K and 20% at 1073 K when the air with a 5 K higher temperature is supplied. Additionally, despite the higher electrochemical performance observed, the cell with a counter-flow arrangement featured by a larger hot area and higher maximum temperature gradients is not preferable for a ceramic SOFC system considering thermal durability. Overall, this study could provide insightful thermal information for the operating condition selection, structure design, and stability assessment of realistic SOFCs combined with their internal reforming process.

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Section: Introductionsupporting

confidence: 65%

Section: Effects Of Air Flow Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature Gradient Analyses of a Tubular Solid Oxide Fuel Cell Fueled by Methanol

Guo

Xia

et al. 2022

Trans. Tianjin Univ.

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“…However, H+SOFCs require pure hydrogen to the exclusion of other more readily available fuels [19,20], but they can work in fully reversible mode [21]. Theoretically, methane steam reforming processes [22][23][24][25][26] can take place at H+SOFC, as in the classical oxygen ion-conducting SOFC. However, there is an issue with the delivery of steam.…”

Section: Introductionmentioning

confidence: 99%

Key Parameters of Proton‐conducting Solid Oxide Fuel Cells from the Perspective of Coherence with Models

et al. 2020

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The paper presents a review of thermal, flow, and material parameters from the perspective of modeling proton‐conducting solid oxide fuel cells (H+SOFC). Comments are offered regarding key parameters selected through research of the literature, featuring mostly material‐related properties of electrolyte and electrodes. Some general relationships are proposed here for the purpose of modeling H+SOFC. The most important parameter is fuel cell operational temperature. Next to the temperature, partial pressures of hydrogen on both sides of H+SOFC impact mainly maximum voltage. The materials from which the fuel cell is built do not directly affect the operation of the fuel cell in the sense that they can be taken as fixed values. Indirectly, their influence can be seen in the resistances, that electrolyte conducts for proton flux and electrodes for electrons. In some cases, double ion/electron conductivity may occur.

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“…4 As in our previously published study, 5 other several studies also show that the heat generation at the cathode is the largest heat source in a SOFC and it must be cooled by appropriate measures. [6][7][8] The influence of changes in the channel design 9 and the flow mechanisms, 10 the integration of heat pipes 11 and internal endothermic chemical reactions 12 on the temperature field are investigated in a large number of studies.…”

mentioning

confidence: 99%

Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell: Non-Equilibrium Thermodynamics versus Monocausal-Based Approach

Gedik,

Wachtel,

Kabelac

2024

ECS Adv.

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This study aims to theoretically analyze the local entropy production rate in a solid oxide electrolyzer cell (SOEC) single cell at T = 1123.15 K and p = 1 bar. Local entropy rates signify loss mechanisms, crucial for cell design and optimization. A semi-2D SOEC model based on non-equilibrium thermodynamics is developed, supplemented by monocausal correlations for direct comparison. The model is validated using KeraCell III data and grid independence analysis. Simulations of electric current density, temperature, heat flow, and local entropy production for various SOEC operating modes are presented. Coupled transport mechanisms significance is discussed, highlighting the pronounced impact of the Peltier effect on heat flux and temperature. The importance of the Peltier effect in SOECs compared to SOFCs is emphasised. The effects of the Seebeck effect on the potential distribution are superimposed by the dominant ohmic losses in the electrolyte. The localisation of entropy production rates shows for exothermic operation that 66.64 % of the total losses are due to the predominantly dominant irreversible ion transport in the electrolyte, while the entanglements in the reaction layers contribute 33.02 % and GDLs less than 1 %.

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Thermal effects of planar high temperature heat pipes in solid oxide cell stacks operated with internal methane reforming

Cited by 47 publications

References 30 publications

Temperature Gradient Analyses of a Tubular Solid Oxide Fuel Cell Fueled by Methanol

Temperature Gradient Analyses of a Tubular Solid Oxide Fuel Cell Fueled by Methanol

Key Parameters of Proton‐conducting Solid Oxide Fuel Cells from the Perspective of Coherence with Models

Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell: Non-Equilibrium Thermodynamics versus Monocausal-Based Approach

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