Thermal conductivity and contact resistance of compressed gas diffusion layer of PEM fuel cell

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Journal Title
Journal ISSN
Volume Title
Faculty of Information and Natural Sciences | D4 Julkaistu kehittämis- tai tutkimusraportti taikka -selvitys
Date
2008
Major/Subject
Mcode
Degree programme
Language
en
Pages
19
Series
Helsinki University of Technology publications in engineering physics. A, Teknillisen korkeakoulun teknillisen fysiikan julkaisuja. A, 853
Abstract
This paper discusses the effect of compression pressure on the mechanical and thermal properties of gas diffusion layers (GDL). The stress-strain curve of the GDL revealed one nonlinear and two piecewise linear regions within the compression pressure range of 0 to 5.5 MPa. The thermal conductivity of the compressed GDL was found to be independent of the compression pressure and was determined to be 1.18 ± 0.11 W m-1 K-1. The thermal contact resistance between the GDL and graphite was evaluated by augmenting experiments with computer modeling. The thermal contact resistance decreased nonlinearly with increasing compression pressure. According to results here, the thermal bulk resistance of the GDL is comparable to the thermal contact resistance between the GDL and graphite. A simple one dimensional model predicted a temperature drop of 1.7-4.4 °C across the GDL and catalyst layer depending on compression pressures.
Description
Keywords
inhomogeneous compression, gas diffusion layer, PEM fuel cells, thermal conductivity, thermal contact resistance, stress-strain curve
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Permanent link to this item
https://urn.fi/urn:nbn:fi:tkk-010237