Effective thermal conductivity and thermal contact resistance of gas diffusion layers in proton exchange membrane fuel cells. Part 1: Effect of compressive load |
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Authors: | E. Sadeghi N. DjilaliM. Bahrami |
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Affiliation: | a Dept. Mechanical Eng., and Institute for Integrated Energy Systems, University of Victoria, P.O. Box 3055, Victoria, BC, Canada V8W 3P6 b Mechatronic Systems Engineering, School of Engineering Science, Simon Fraser University, Surrey, BC, Canada V3T 0A3 |
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Abstract: | Heat transfer through the gas diffusion layer (GDL) is a key process in the design and operation of a PEM fuel cell. The analysis of this process requires determination of the effective thermal conductivity as well as the thermal contact resistance associated with the interface between the GDL and adjacent surfaces/layers.In the present study, a custom-made test bed that allows the separation of effective thermal conductivity and thermal contact resistance in GDLs under vacuum and ambient conditions is described. Measurements under varying compressive loads are performed using Toray carbon paper samples with a porosity of 78% for a range of thicknesses. The measurements are complemented by compact analytical models that achieve good agreement with experimental data. A key finding is that thermal contact resistance is the dominant component of the total thermal resistance; neglecting this phenomenon may result in significant errors in evaluating heat transfer rates and temperature distributions. |
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Keywords: | TCR Interface Effective thermal conductivity Conduction Compression |
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