Sensor-less control of the methanol concentration of direct methanol fuel cells at varying ambient temperatures

Title
Sensor-less control of the methanol concentration of direct methanol fuel cells at varying ambient temperatures
Authors
안명기아사드메흐무드하흥용
Keywords
sensor-less control; methanol concentration; direct methanol fuel cell; ambient temperature; Stack temperature
Issue Date
2014-09
Publisher
Applied energy
Citation
VOL 129, 104-111
Abstract
A new version of an algorithm is used to control the methanol concentration in the feed of DMFC systems without using methanol sensors under varying ambient temperatures. The methanol concentration is controlled indirectly by controlling the temperature of the DMFC stack, which correlates well with the methanol concentration. Depending on the ambient temperature relative to a preset reference temperature, two different strategies are used to control the stack temperature: either reducing the cooling rate of the methanol solution passing through an anode-side heat exchanger; or, lowering the pumping rate of the pure methanol to the depleted feed solution. The feasibility of the algorithm is evaluated using a DMFC system that consists of a 200 W stack and the balance of plant (BOP). The DMFC system includes a sensor-less methanol controller that is operated using a LabView system as the central processing unit. The algorithm is experimentally confirmed to precisely control the methanol concentration and the stack temperature at target values under an environment of varying ambient temperatures.
URI
http://pubs.kist.re.kr/handle/201004/47625
ISSN
03062619
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KIST Publication > Article
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