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A pinch and exergy analysis of the configuration of a stationary polymer electrolyte fuel cell system
KTH, Superseded Departments, Chemical Engineering and Technology. (Energiprocesser, Energy Processes)
KTH, Superseded Departments, Chemical Engineering and Technology. (Energiprocesser, Energy Processes)ORCID iD: 0000-0002-0635-7372
2004 (English)In: Energy-Efficient, Cost-Effective and Environmentally-Sustainable Systems and Processes, Vols 1-3 / [ed] Rivero, R; Monroy, L; Pulido, R; Tsatsaronis, G, MEXICO: INST MEXICANO DEL PETROLEO , 2004, 703-715 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, a pinch-based evaluation and a detailed exergy analysis are applied in order to evaluate the configuration of a stationary polymer electrolyte fuel cell system. The low-pressure fuel cell system includes natural gas steam reforming and is designed to supply a building with heat and power. The exergy balance is calculated from the exergy content of the flows in the system, with the condensed water taken into consideration. By introducing the heat supplied from the combustor to the pinch composite curves, the design and evaluation of the heat exchanger network is aided. The convenient presentation obtained of the energy balance and the exergy destruction points out the importance of the different losses within the 23 components in the fuel cell system and will be used as a basis for future research. The analysis makes it clear that the total efficiency of the system configuration is nearly optimised at 98 % LHV (89 % HHV), but that the electrical efficiency is low. To increase the electrical efficiency, the design of the fuel cell stack has to be improved. The only way to increase the thermal efficiency without changing any system parameters is to decrease the return temperature from the heat sink. The modelling work is described in comparison to measured data. The thermodynamic equations, including a methodology for handling condensed water, are attached to the paper.

Place, publisher, year, edition, pages
MEXICO: INST MEXICANO DEL PETROLEO , 2004. 703-715 p.
Keyword [en]
fuel cell system, pinch technology, exergy analysis, PEFC, CHP
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-44696ISI: 000232747300066ISBN: 968-489-027-3 (print)OAI: oai:DiVA.org:kth-44696DiVA: diva2:451789
Conference
17th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy and Process Systems (ECOS 2004) Location: Guanajuato, MEXICO Date: JUL 07-09, 2004
Note

QC 20111027

Available from: 2011-10-27 Created: 2011-10-25 Last updated: 2016-04-19Bibliographically approved

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