A Feasibility Study of Placing a Heated Turbulence Grid in Front of an Air-Cooled Fuel Cell Stack in Freezing Conditions

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Abstrakt

This paper aims to better understand the temperature profile of a
turbulence inducing grid if pre-heating of the incoming air in the
cathode channel is required when the stack is operating under
freezing conditions. The goal of this study is to design the grid by
changing its thickness and the number of pores. A three-dimensional,
steady-state computational fluid dynamic model was developed and
validated for a baseline case of a single cathode channel of an aircooled cell. The computational domain consists of the cathode flow
channel, a gas diffusion layer, and the turbulence inducing grid. Four
different grid designs were analyzed and compared, and in the best
case heating of the turbulence grid was achieved where the
temperature of the grid will be 236 ºC and the power consumption
will be around 30 % of the total power produced by the fuel cell
stack. It is concluded that 2 mm thickness is not sufficient leading
to too high temperatures, and a multitude of staggered grids might
be required.
OriginalsprogEngelsk
TitelECS Transactions
Antal sider12
Vol/bind107
Publikationsdato7 maj 2022
Udgave7
Sider119-130
ISBN (Elektronisk)9781607685395
DOI
StatusUdgivet - 7 maj 2022

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