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Humidity Distribution and Performance Variation of a PEMFC Multi Stack System According to the Direction of Anodic Supply

고분자 전해질 연료전지 멀티 스택 시스템의 수소극 흐름방향에 따른 습도분포 및 성능변화

  • Lee, Yongtaek (Department of Mechanical Engineering, Hannam University)
  • Received : 2017.12.13
  • Accepted : 2018.02.03
  • Published : 2018.03.10

Abstract

In this study the performance and humidity variation for 2 unit cells connected in series were experimentally measured. The relative flow direction of hydrogen and air was changed from parallel flow to counter flow. Internal humidity distribution was then measured by 5 embedded sensors on each channel. In all experimental conditions, the former unit cell showed a better performance and the gap is noted to be higher when counter flow is applied. The performance was noted to be higher at high humidification case in the parallel flow. However, in the counter flow, the difference of performance according to the humidification is negligible. Hydrogen and air are discharged from the PEMFC unsaturated with water vapor at parallel flow/low humidification condition, which explains lower performance of the PEMFC than other conditions. The humidities in hydrogen and air streams of counter flow were noted to increase rapidly even at low humidification condition and the consequential even hydration of membrane is the reason of higher performance.

Keywords

References

  1. Kwac, L. K. and Kim, H. G., 2008, Investigation of gas flow characteristics in proton exchange membrane fuel cell, Journal of Mechanical Engineering and Technology, Vol. 22, pp. 1561-1567.
  2. Ryu, E. H. and Kim, W. T., 2013, Performance analysis of PEMFC depending on the flow direction of reactant gas in cathode gas channel, Journal of Korean Society of Mechanical Technology, Vol. 15, pp. 97-102. https://doi.org/10.17958/ksmt.15.1.201302.97
  3. Liu, X., Guo, H., and Ma, C., 2006, Water flooding and two-phase flow in cathode channels of proton exchange membrane fuel cells, Journal of Power Sources, Vol. 156, pp. 267-280. https://doi.org/10.1016/j.jpowsour.2005.06.027
  4. Tuber, K., Pocza, D., and Hebling, C., 2003, Visualization of water buildup in the cathode of a transparent PEM fuel cell, Journal of Power Sources, Vol. 124, pp. 403-414.
  5. Lee, Y., Kim, B., and Kim, Y., 2009, An experimental study on water transport through the membrane of a PEFC operating in the dead-end mode, International Journal of Hydrogen Energy, Vol. 34, pp. 7768-7779. https://doi.org/10.1016/j.ijhydene.2009.07.010
  6. Lee, D. and Bae, J., 2012, Visualization of flooding in a single cell and stacks by using a newly-designed transparent PEMFC, International Journal of Hydrogen Energy, Vol. 37, pp. 422-435.
  7. Park, J., Li, X., Tran, D., Abdel-Basel, T., Hussey, D. S., Jacobson, D. L., and Arif, M., 2008, Neutron imaging investigation of liquid water distribution in and the performance of a PEM fuel cell, International Journal of Hydrogen Energy, Vol. 33, pp. 3373-3384.
  8. Ludlow, D. J., Calebrese, C. M., Yu, S. H., Dannehy, C. S., Jacobson D. L., Hussey, D. S., Arif, M., Jensen M. K., and Eisman G. A., 2006, PEM fuel cell membrane hydration measurement by neutron imaging, Journal of Power Sources, Vol. 162, pp. 271-278. https://doi.org/10.1016/j.jpowsour.2006.06.068
  9. Lee, Y. and Yang, G. Y., 2015, Measurement of humidity distribution in a proton exchange membrane fuel cell using channel embedded humidity sensors, Transaction of Korean Society of Mechanical Engineering B, Vol. 5, pp. 397-403.
  10. Gorgun, H., Arcak M., and Barbir F., 2006, An algorithm for estimation of membrane water content in PEM fuel cells, Journal of Power Sources, Vol. 157, pp. 389-394. https://doi.org/10.1016/j.jpowsour.2005.07.053