Gravity effect on water discharged in Channel-Visible PEMFC cathode and transient response analysis
Date Issued
2010
Date
2010
Author(s)
Chun-Ting, Liao
Abstract
This study investigates the gravity effect on water in fuel cells. Water generated on the cathode side is a major phenomenon in fuel cells. In actual circumstances, the volume and weight of water significantly affect the PEMFC efficiency. However, many simulations ignore the weight of water. To verify how gravity affect fuel cells, this study places the fuel cell at various positions, 0 ° , 30 °, 60 °, and 90 ° between the cathode side (anode positioned upward) and the horizon. The experimental goal is to measure the impact of gravity on the performance of a PEMFC at different angles. Gravity profoundly impacts water management. An AC Impedance Analyzer elucidated this phenomenon. Additionally, the water distribution can be observed via this channel-visible PEMFC. Transient response under dynamic load conditions has attracted tremendous interest in recent years. The mechanisms identified so far generally center around the membrane, and include a range of processes such as partial membrane dehydration, momentary flooding in the catalyst layer, instantaneous shortfall in fuel and oxidant supply, and transition between water-rich and water-lean states. In light of such widely varying theories, there appears to be a need for experimental work to determine the primary source of performance shortfall. In particular, interactions of fuel cell transients with RH through membrane hydration or dehydration should be clarified. We present an experimental study examining transient response following a step change in operating voltage, using cell current density as the primary response parameters. This study also discusses cell performance under other operating factors such as different fuel, stoichiometry, and vibration.
Subjects
Gravity
AC Impedance
Water management
Transient
Vibration
Type
thesis
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