Thermal contact resistance in solid oxide fuel cell stacks

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

doi:10.1016/j.jpowsour.2015.09.031

Cited by 19 publications

(5 citation statements)

References 37 publications

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“…Consequently, wire attachments with greater electrical and mechanical effectiveness and robustness can be achieved by the contribution of the spring. Therefore, the SBC method can be proposed as a promising candidate to deal with the current-collection related issues due to high resistance at the connection points 8 . However, further investigation is required to identify the feasibility of the techniques for different types of manifolds and for stack-scale systems.…”

Section: Resultsmentioning

confidence: 99%

“…The most important parameter directly related with high cost and reliability is the high operating temperature (800–1000 °C) of SOFC 6 . As a result of high temperature, thermal stresses across the cell materials are induced due to different coefficient of thermal expansion (CTE) of the SOFC components, leading to micro-scale cracking, resulting in cell (and possibly system) failure 8–10 . Therefore, understanding the temperature characteristics of SOFC is a key point to overcome high temperature-related issues.…”

Section: Introductionmentioning

confidence: 99%

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Spring Based Connection of External Wires to a Thin Film Temperature Sensor Integrated Inside a Solid Oxide Fuel Cell

Guk

Venkatesan

Sayan

et al. 2019

Sci Rep

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Thermal management of SOFCs (solid oxide fuel cell) is important for helping to minimise high temperature-related performance losses and maximising cell/stack lifetime. Thin film sensor technology is proposed as an excellent candidate to measure the cell temperature during operation due to its negligible mass, minimal disturbance to normal operation and higher temporal and spatial resolutions. However, the effective application of such sensors in SOFC systems is a challenging endeavour and predicated on incorporating the external wire attachments to complete the electrical circuit. This is because of the high sensitivity of SOFC materials to any interference to operation, limited available space and harsh operating conditions. In this paper, a new concept of packaging external wire attachments to the thin film sensor is described to enable the integration of the sensor in the SOFC system. Temperature measurements have been monitored under OCV and operating condition with the thin film sensor directly from SOFC cathode surface via proposed spring-based wire connection, from room temperature to SOFC operating temperature. The impact of the parameters including contact resistance (Rc) between sensor pads and attached wire on monitored temperature has also been analysed with the contribution of conductive paste. High temporal and spatial resolutions have been obtained with the implemented sensor.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spring Based Connection of External Wires to a Thin Film Temperature Sensor Integrated Inside a Solid Oxide Fuel Cell

Guk

Venkatesan

Sayan

et al. 2019

Sci Rep

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“…– can represent all the heat exchange mechanisms, i.e., conduction, convection and radiation. As far as the radiative heat transfer concerns it may be linearized according to and so represented by the Eq. .…”

Section: Model Descriptionmentioning

confidence: 99%

“…As far as the conductive heat flow concerns the contact area between the stack and manifold/gasket (schematically represented in Figure ) is very limited, thus it can be neglected. Moreover, in order to verify the assumption on radiative heat exchange, the total heat flux was assumed to be only radiative and calculated according to . By setting the global view factor between the stack and the furnace to 1 and considering the values of K 1 and K 2 reported in Table , the mean value of the stack emissivity for the 20 steady state points was estimated to be 0.06.…”

Section: Parameters Identificationmentioning

confidence: 99%

Control‐Oriented Modeling of Non‐Adiabatic Solid Oxide Fuel Cell Stacks

et al. 2017

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The paper presents a lumped zero dimensional (0D) model for the simulation of solid oxide fuel cell (SOFC) stack thermal dynamics. Particularly, a dedicated sub-model is developed, via a mixed gray/black-box modeling approach, to suitably treat the heat exchange mechanisms between the stack and its surrounding environment. Such a sub-model was embedded into an existing 0D simulator and then tested via comparison with temperature sensor measurements. The hardware sensor is indeed particularly critical, due to its location and the typically high operating temperature characterizing SOFC. Therefore, suitable experimental transients were performed at Topsoe fuel cell test-bench, thus allowing verifying the accuracy and generalization granted by the 0D model in reproducing stack outlet temperature trajectories, both in steady-state and dynamic operations. As a result, the modeling approach here proposed is proven effective either to replace the hardware temperature sensor at stack outlet or for redundancy purposes to improve reliability. Moreover, the 0D model can be deployed for offline design of SOFC systems' control strategies, as well as for real-time diagnostic and control applications

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“…63 Studying TCR in this application will help find alternatives to the current seal materials and plate connectors for better thermal management of fuel cell stacks. 66 Diling et al 67 studied the TCR in solid oxide fuel cell (SOFC) stacks and reported a great improvement in their simulation results when they applied their experimental results.…”

Section: Introductionmentioning

confidence: 99%

Advances in thermal contact resistance studies

Murwamadala

Veeredhi

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The demand for accurate Thermal Contact Resistance analysis and prediction continues to increase with the advancement of technology. In applications such as manufacturing, it is beneficial to understand the Thermal Contact resistance between the workpiece and tool, or between the tool and debris or shavings to accurately predict the tool wear rate. It is essential to understand and analyze this parameter in aerospace, nuclear power generation, supercar braking systems, and similar applications where close tolerances are used. The continued technological advancements indicate further opportunities for research in Thermal Contact Resistance. This article surveys and summarizes industrial applications’ as well as experimental and theoretical studies. In addition recent advances in both experimental methods and predictive studies are also comprehensively summarized and highlight the trends and future needs of studies in Thermal Contact Resistance, these included recent advances in transient and steady state experimental methods. There is a clear need for optimization, versatility, and economical improvement of these methods. Moreover, the rise in advanced metrological technologies, instrumentation, and thermal measurement systems.

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Thermal contact resistance in solid oxide fuel cell stacks

Cited by 19 publications

References 37 publications

Spring Based Connection of External Wires to a Thin Film Temperature Sensor Integrated Inside a Solid Oxide Fuel Cell

Spring Based Connection of External Wires to a Thin Film Temperature Sensor Integrated Inside a Solid Oxide Fuel Cell

Control‐Oriented Modeling of Non‐Adiabatic Solid Oxide Fuel Cell Stacks

Advances in thermal contact resistance studies

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