Comparative evaluation of heating techniques for room temperature startup of a PEMFC

Chaitanya J. Bapat, Stefan Thynell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We study the use of different external heating techniques for startup of a PEM fuel cell initially at room temperature. If a hot liquid is used to heat the fuel cell, the startup time depends on the Reynolds number of the hot liquid flow and also on the convective heat transfer coefficient at the liquid channel/bipolar plate interface. Therefore, apart from the energy required to heat the liquid, additional power is required for the external hot liquid pump. Fuel cell can also be directly heated by using electric heaters. Thin flexible heaters were found to be most suitable for the purpose as they allow the use of thin bipolar plates and reduce the thermal contact resistance at the heater/bipolar plate interface. The thermal mass of the bipolar plates was found to be an important factor affecting the startup time. Hence using materials with lower heat capacities reduces startup time. Embedding a heating element in the GDL reduces the startup time as the thermal mass of the GDLs and MEA is much smaller than the bipolar plate. GDLs with low through-plane thermal conductivities and high in-plane thermal conductivities are able to further reduce the startup time when used in conjunction with a heating element in the GDL.

Original languageEnglish (US)
Title of host publicationProceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology
Pages257-266
Number of pages10
DOIs
StatePublished - Dec 1 2008
Event6th International Conference on Fuel Cell Science, Engineering, and Technology - Denver, CO, United States
Duration: Jun 16 2008Jun 18 2008

Publication series

NameProceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology

Other

Other6th International Conference on Fuel Cell Science, Engineering, and Technology
CountryUnited States
CityDenver, CO
Period6/16/086/18/08

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
Heating
Liquids
Electric heating elements
Fuel cells
Thermal conductivity
Temperature
Contact resistance
Heat transfer coefficients
Specific heat
Reynolds number
Hot Temperature
Pumps

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Bapat, C. J., & Thynell, S. (2008). Comparative evaluation of heating techniques for room temperature startup of a PEMFC. In Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology (pp. 257-266). (Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology). https://doi.org/10.1115/FuelCell2008-65156
Bapat, Chaitanya J. ; Thynell, Stefan. / Comparative evaluation of heating techniques for room temperature startup of a PEMFC. Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology. 2008. pp. 257-266 (Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology).
@inproceedings{b027f94304104d769bc3db23253663ac,
title = "Comparative evaluation of heating techniques for room temperature startup of a PEMFC",
abstract = "We study the use of different external heating techniques for startup of a PEM fuel cell initially at room temperature. If a hot liquid is used to heat the fuel cell, the startup time depends on the Reynolds number of the hot liquid flow and also on the convective heat transfer coefficient at the liquid channel/bipolar plate interface. Therefore, apart from the energy required to heat the liquid, additional power is required for the external hot liquid pump. Fuel cell can also be directly heated by using electric heaters. Thin flexible heaters were found to be most suitable for the purpose as they allow the use of thin bipolar plates and reduce the thermal contact resistance at the heater/bipolar plate interface. The thermal mass of the bipolar plates was found to be an important factor affecting the startup time. Hence using materials with lower heat capacities reduces startup time. Embedding a heating element in the GDL reduces the startup time as the thermal mass of the GDLs and MEA is much smaller than the bipolar plate. GDLs with low through-plane thermal conductivities and high in-plane thermal conductivities are able to further reduce the startup time when used in conjunction with a heating element in the GDL.",
author = "Bapat, {Chaitanya J.} and Stefan Thynell",
year = "2008",
month = "12",
day = "1",
doi = "10.1115/FuelCell2008-65156",
language = "English (US)",
isbn = "0791843181",
series = "Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology",
pages = "257--266",
booktitle = "Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology",

}

Bapat, CJ & Thynell, S 2008, Comparative evaluation of heating techniques for room temperature startup of a PEMFC. in Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology. Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology, pp. 257-266, 6th International Conference on Fuel Cell Science, Engineering, and Technology, Denver, CO, United States, 6/16/08. https://doi.org/10.1115/FuelCell2008-65156

Comparative evaluation of heating techniques for room temperature startup of a PEMFC. / Bapat, Chaitanya J.; Thynell, Stefan.

Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology. 2008. p. 257-266 (Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Comparative evaluation of heating techniques for room temperature startup of a PEMFC

AU - Bapat, Chaitanya J.

AU - Thynell, Stefan

PY - 2008/12/1

Y1 - 2008/12/1

N2 - We study the use of different external heating techniques for startup of a PEM fuel cell initially at room temperature. If a hot liquid is used to heat the fuel cell, the startup time depends on the Reynolds number of the hot liquid flow and also on the convective heat transfer coefficient at the liquid channel/bipolar plate interface. Therefore, apart from the energy required to heat the liquid, additional power is required for the external hot liquid pump. Fuel cell can also be directly heated by using electric heaters. Thin flexible heaters were found to be most suitable for the purpose as they allow the use of thin bipolar plates and reduce the thermal contact resistance at the heater/bipolar plate interface. The thermal mass of the bipolar plates was found to be an important factor affecting the startup time. Hence using materials with lower heat capacities reduces startup time. Embedding a heating element in the GDL reduces the startup time as the thermal mass of the GDLs and MEA is much smaller than the bipolar plate. GDLs with low through-plane thermal conductivities and high in-plane thermal conductivities are able to further reduce the startup time when used in conjunction with a heating element in the GDL.

AB - We study the use of different external heating techniques for startup of a PEM fuel cell initially at room temperature. If a hot liquid is used to heat the fuel cell, the startup time depends on the Reynolds number of the hot liquid flow and also on the convective heat transfer coefficient at the liquid channel/bipolar plate interface. Therefore, apart from the energy required to heat the liquid, additional power is required for the external hot liquid pump. Fuel cell can also be directly heated by using electric heaters. Thin flexible heaters were found to be most suitable for the purpose as they allow the use of thin bipolar plates and reduce the thermal contact resistance at the heater/bipolar plate interface. The thermal mass of the bipolar plates was found to be an important factor affecting the startup time. Hence using materials with lower heat capacities reduces startup time. Embedding a heating element in the GDL reduces the startup time as the thermal mass of the GDLs and MEA is much smaller than the bipolar plate. GDLs with low through-plane thermal conductivities and high in-plane thermal conductivities are able to further reduce the startup time when used in conjunction with a heating element in the GDL.

UR - http://www.scopus.com/inward/record.url?scp=77952586471&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952586471&partnerID=8YFLogxK

U2 - 10.1115/FuelCell2008-65156

DO - 10.1115/FuelCell2008-65156

M3 - Conference contribution

AN - SCOPUS:77952586471

SN - 0791843181

SN - 9780791843185

T3 - Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology

SP - 257

EP - 266

BT - Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology

ER -

Bapat CJ, Thynell S. Comparative evaluation of heating techniques for room temperature startup of a PEMFC. In Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology. 2008. p. 257-266. (Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology). https://doi.org/10.1115/FuelCell2008-65156