Dynamic response of steam-reformed, methanol-fueled, polymer electrolyte fuel cell systems

PDF Version Also Available for Download.

Description

Analytical models were developed for the dynamic response of steam-reformed, methanol-fueled, polymer electrolyte fuel cell (PEFC) systems for transportation applications. Focus is on heat transfer effects likely to limit rapid response of PEFC systems. Depending on the thermal mass, the heat exchangers and steam reformer can have time constants on the order of several seconds to many minutes. On the other hand, the characteristic time constants associated with pressure/density disturbances arising from flow rate fluctuations are on the order of milliseconds. In vehicular applications, the response time of the turbomachinery, which is determined by rotational inertia, can be on the ... continued below

Physical Description

6 p.

Creation Information

Geyer, H.K.; Ahluwalia, R.K. & Kumar, R. July 1, 1996.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 57 times . More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

Analytical models were developed for the dynamic response of steam-reformed, methanol-fueled, polymer electrolyte fuel cell (PEFC) systems for transportation applications. Focus is on heat transfer effects likely to limit rapid response of PEFC systems. Depending on the thermal mass, the heat exchangers and steam reformer can have time constants on the order of several seconds to many minutes. On the other hand, the characteristic time constants associated with pressure/density disturbances arising from flow rate fluctuations are on the order of milliseconds. In vehicular applications, the response time of the turbomachinery, which is determined by rotational inertia, can be on the order of seconds or less. Dynamic reformer model was used to examine methanol conversion efficiency and thermal performance during a cold start. Response times are determined to achieve 50-100% of the steady-state methanol conversion for two catalyst tube diameters. Thermal performance is considered in terms of the approach to steady-state temperature, possibility of catalyst overheating, and penalty in system efficiency incurred during startup time. For the complete reference PEFC system, various turn-down scenarios were simulated by varying the relative rates of change of fuel cell loading and system flows. Depending on relative rates of cell loading changes to flow rate changes, overheating of the catalyst can occur due to excess heat transfer in the reformer preheater; this can be controlled by an additional water quench between catalyst bed and preheater, but only if the flow rate change is sufficiently fast relative to load changes.

Physical Description

6 p.

Notes

OSTI as DE96012691

Source

  • 31. intersociety energy conversion engineering conference, Washington, DC (United States), 9-14 Aug 1996

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Other: DE96012691
  • Report No.: ANL/TD/CP--90194
  • Report No.: CONF-960805--5
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 267462
  • Archival Resource Key: ark:/67531/metadc671389

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • July 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • Dec. 16, 2015, 6:46 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 57

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Geyer, H.K.; Ahluwalia, R.K. & Kumar, R. Dynamic response of steam-reformed, methanol-fueled, polymer electrolyte fuel cell systems, article, July 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc671389/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.