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Adzžicć, M.; Heitor, M. V.; Santos, Diogo Pereira dos

doi:10.1023/a:1018468911785

Cited by 18 publications

(2 citation statements)

References 6 publications

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“…Even sheathed thermocouples in contact with the cell surface may induce a significant temperature error as a result of conduction. Adzic et al 23 developed a thermocouple technique for mapping cathode temperatures in operating cells (565 cm) that revealed temperature variation of ¡4uC over an operating cathode surface at a mean temperature of 951uC with hot spots having a temperature of 16uC higher.…”

Section: Stresses At Non-uniform Temperaturementioning

confidence: 99%

Residual stress and thermal cycling of planar solid oxide fuel cells

Atkinson¹,

Sun²

2007

Materials Science and Technology

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The published literature relating to damage to planar solid oxide fuel cells caused by thermally induced stresses and thermal cycling is reviewed. This covers reported studies of thermal cycling performance and stresses induced by temperature gradients and differences in thermal expansion coefficients in typical planar SOFC configurations, namely electrolyte supported; anode supported and inert substrate supported cells. Generally good agreement is found between electrolyte residual stresses measured by X-ray diffraction or cell curvature and stresses calculated from simple thermo-elastic analysis. Finite element modelling of temperature distributions in cells and stacks in steady state operation are well advanced and capable of being extended to compute stress distributions. Failure criteria are then discussed for laminated cell structures based on critical energy release rate fracture mechanics models developed originally for coatings. However, in most cases the data required to apply the models quantitatively (such as elastic moduli of actual laminated material and fracture energies of materials and interfaces) are not available. Where data are available there are inconsistencies that require resolution. Seals are critical components in many planar solid oxide fuel cell configurations, but again there are discrepancies in experimental mechanical properties and the role of internal stresses in their fracture. In addition, there is as yet no firm evidence that thermal cycling damage involves any true materials fatigue process. Effect of thermal cycling on SOFC integrityTaniguchi et al. 7 investigated the thermal cycling performance of electrolyte supported planar SOFCs

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Section: Stresses At Non-uniform Temperaturementioning

confidence: 99%

Residual stress and thermal cycling of planar solid oxide fuel cells

Atkinson¹,

Sun²

2007

Materials Science and Technology

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“…There has been extensive research work on computational fluid dynamics (CFD)‐modelling of thermal behaviour of SOFC cells 1–3 and stacks as well as for electrolysis cells 4–6. Experimental studies focusing on temperature distributions within stacks and the different influence parameters 7–9 analyse the situation in some standard arrangement, however there is little work on improving thermal control under dynamic operation 3 or of thermal stack integration 10.…”

Section: Introductionmentioning

confidence: 99%

Integration of Planar Heat Pipes to Solid Oxide Cell Short Stacks

2015

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This work presents the results of a thermal balancing, heat removal and supply mechanism via high temperature heat spreaders integrated to the solid oxide cell (SOC) stacks. Planar alkali metal heat pipes for almost isothermal two‐directional heat transfer at high power densities are incorporated into the metal interconnector structure of SOC‐short stacks. The objective of this concept is a temperature gradient shrinking within the stacks and a thermal control of SOFC system with a largely reduced additional air cooling. Subsequent to the development of planar heat pipe interconnectors with thickness down to 4 mm and heat transfer rates of up to 150 W per cm2 cross sectional area at isothermal operation, this paper describes their integration into the SOC stack structure. Therefore, short stacks with incorporated planar heat pipes are designed and built up for evaluation. The experimental study focuses on the influence of planar heat pipe interconnectors on temperature distributions within short stacks under various thermal load conditions. The experiments demonstrate the beneficial effects on thermal control of the stack structure and allow a first estimation of their amplitudes.

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