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Experimental study on the evolution and distribution of interface heat characteristics in proton exchange membrane fuel cells with orientational channels.

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Title: Experimental study on the evolution and distribution of interface heat characteristics in proton exchange membrane fuel cells with orientational channels.
Authors: Guo, Zi Rui1 (AUTHOR), Chen, Hao1 (AUTHOR) chenh@bjut.edu.cn, Guo, Hang1 (AUTHOR), Gao, Zhe1 (AUTHOR), Ye, Fang1 (AUTHOR)
Source: Journal of Power Sources. Dec2024, Vol. 623, pN.PAG-N.PAG. 1p.
Subjects: Heat transfer, Calorimetry, Heat flux, Temperature distribution, Channel flow
Abstract: Heat signals can evaluate the electrochemical reaction rate and heat transfer intensity in fuel cells, which have great impacts on power and durability of fuel cells. In this study, the film sensor is utilized to measure the temperature and heat flux of fuel cells, and the difference in heat characteristics between the straight channel fuel cell and the orientational channel fuel cell is studied experimentally for the first time. The results demonstrate that the current and temperature in the downriver segment of the straight channel fuel cell decay and fluctuate. Therefore, an orientational channel with baffles and tapered flow channels is designed, and the evolution and distribution of interface heat signals are investigated. The results indicate that the orientational channel improves reactant transmission and alleviates water flooding in the downriver segment. Thus, current and temperature increase, leading to a performance improvement of 16.9 %. Temperature and heat flux positively correlate with current; however, the temperature changes exhibit hysteresis. Meanwhile, changes in heat flux need to consider both heat generation and heat transmission. In comparison to a straight channel fuel cell, the performance of the orientational channel fuel cell proves more adaptable to changes in operating conditions. • Heat measurement of the orientational channel cell is carried out with film sensors. • Orientational cell with the tapered channel and baffles improves current by 16.9 %. • Temperature and heat flux are proportional to current while temperature is lagging. • PEMFC with orientational channel is more adaptable to changing operation conditions. • Orientational structure improves the uniformity of temperature distribution. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Heat signals can evaluate the electrochemical reaction rate and heat transfer intensity in fuel cells, which have great impacts on power and durability of fuel cells. In this study, the film sensor is utilized to measure the temperature and heat flux of fuel cells, and the difference in heat characteristics between the straight channel fuel cell and the orientational channel fuel cell is studied experimentally for the first time. The results demonstrate that the current and temperature in the downriver segment of the straight channel fuel cell decay and fluctuate. Therefore, an orientational channel with baffles and tapered flow channels is designed, and the evolution and distribution of interface heat signals are investigated. The results indicate that the orientational channel improves reactant transmission and alleviates water flooding in the downriver segment. Thus, current and temperature increase, leading to a performance improvement of 16.9 %. Temperature and heat flux positively correlate with current; however, the temperature changes exhibit hysteresis. Meanwhile, changes in heat flux need to consider both heat generation and heat transmission. In comparison to a straight channel fuel cell, the performance of the orientational channel fuel cell proves more adaptable to changes in operating conditions. • Heat measurement of the orientational channel cell is carried out with film sensors. • Orientational cell with the tapered channel and baffles improves current by 16.9 %. • Temperature and heat flux are proportional to current while temperature is lagging. • PEMFC with orientational channel is more adaptable to changing operation conditions. • Orientational structure improves the uniformity of temperature distribution. [ABSTRACT FROM AUTHOR]
ISSN:03787753
DOI:10.1016/j.jpowsour.2024.235357