Experimental study on performance analysis of direct methanol fuel cell for efficient operation
- Experimental study on performance analysis of direct methanol fuel cell for efficient operation
- 장영수; 조창환; 김용찬
- DMFC; performance; crossover
- Issue Date
- Grove Fuel Cell Symposium
- , 1-1
- The direct methanol fuel cell (DMFC) is actively investigated as a portable
device and micro power sources because it has simple system configuration
and high energy density. Efficient operation of fuel cell system is very important
for long-sustained power supply because of limited system and fuel tank size.
The optimum operation of stack was studied through performance experiment of
In this study, the DMFC stack is consisted of 20-cells which have active area
of 4800㎟(80mm*60mm). The fuel consumption of stack includes crossover
effect which consumes the fuel without electric energy generation. Therefore,
the crossover has to be analyzed for calculating the stack efficiency. The direct
methanol fuel cell performance curves were obtained as a function of three
parameters; temperature, methanol concentration, and load current. And fuel
consumption was also measured. A semi-empirical performance model was
developed using experimental data. Performance simulation was carried out to
determine the optimum operation conditions using developed semi-empirical
stack performance model.
The methanol concentration has to be varied with respect to the required
power for efficient operation of the stack. The methanol solution is supposed to
be supplied with concentration between 0.5 and 1 molarity. For increasing the
electric power, the concentration of methanol has to be increased. This study
adopted maximum power operating method and the constant voltage operating
method for DMFC system control. The constant voltage operating method
shows more efficient performance than maximum power operating method. For
optimal operation of DMFC, it is recommended that methanol concentration
should be controlled to meet load current maintaining constant voltage.
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- KIST Publication > Conference Paper
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