Testing and model-aided analysis of a 2kWel PEMFC CHP-system

König, P.; Weber, André; Lewald, N.; Aicher, T.; Jörissen, Ludwig; Ivers-Tiffée, Ellen; Szolak, Robert; Brendel, M.; Kaczerowski, J.

doi:10.1016/j.jpowsour.2005.02.051

Cited by 28 publications

(12 citation statements)

References 12 publications

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“…The system was characterized by different load cycles and measurements [1]. During further extensive tests with the system under different operating conditions (variation of the cooling water temperature, cooling water flow, load following) and start-up and shut-down procedures, the system parameters and characteristics were defined, as shown in Table 1.…”

Section: Pemfc Chp System Edisonmentioning

confidence: 99%

“…Despite considerable progress in the development of prototypes [1,2] and pre-commercial systems [3,4], a product launch is still a few years away due to insufficient operational experience as well as the requirement to optimize efficiency and lifetime. An exact comparison between the different fuel cell CHP systems as well as detailed conclusions concerning efficiencies and optimization potential is not possible.…”

Section: Introductionmentioning

confidence: 99%

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Model‐Aided Testing of a PEMFC CHP System

et al. 2007

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Based on system tests, a model‐aided system analysis tool is developed to model different types of fuel cell systems. In the experimental modeling approach, a model system which is general and flexible is parameterized on the basis of data measured from a system. The aim of this model is to obtain information concerning the efficiency of the system and its individual system components, to reveal problems during operation and to analyze the potential for optimization. A first evaluation of the procedure is performed on a 2 kWel and 4 kWthermal Polymer Electrolyte Membrane fuel cell (PEMFC) Combined Heat and Power (CHP) prototype system, installed at the Institut für Werkstoffe der Elektrotechnik (IWE), Universität Karlsruhe (TH). The system, which was developed at the Zentrum für Sonnenenergie‐ und Wasserstoff‐Forschung ZSW, Ulm (FC stack) and the Fraunhofer‐Institut für Solare Energiesysteme ISE, Freiburg (natural gas reformer) is operated and tested in close cooperation with the Stadtwerke Karlsruhe. The CHP system including the measurement equipment, as well as the modeling and simulation approach based on system tests are presented.

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Section: Pemfc Chp System Edisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model‐Aided Testing of a PEMFC CHP System

et al. 2007

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“…Wallmark et al [8] simulated a PEMFC-CHP system in which heat was recovered from the reformer. König et al [9] manufactured and tested a small (2 kW) PEMFC-CHP system in which thermal energy was recovered from the reformer. In addition to CHP applications, the integration of fuel cells with other heat engines, especially turbomachines such as the gas turbines, is another way to improve fuel economy [10].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to unavoidable overpotentials (voltage losses) of the cell stack, the thermal energy required to generate hydrogen from a fossil fuel source accounts for the gap between the ideal and realizable efficiencies. Some of the previous studies have presented scattered examples of the impact of thermal management as introduced in the last paragraph [7][8][9]. However, a more systematic study, which comparatively evaluates various types of thermal management methods and provides system design guidelines, is needed.…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal management and integration with turbomachinery on the performance of polymer electrolyte membrane fuel cell systems

Ryu

Park

et al. 2011

J Mech Sci Technol

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Polymer electrolyte membrane fuel cells (PEMFCs) have many good characteristics for small power sources such as low operating temperature and high power density. In this study, the effects of thermal management on the performance of PEMFC systems using natural gas fuel, and the effects of integrating PEMFC systems with turbomachines, were investigated. Firstly, performance of various system configurations differing in the thermal management of reforming and stack cooling processes was comparatively analyzed. Then, various integrated system combinations with turbomachines (compressors and turbines) were analyzed. We performed a parametric analysis of the influence of turbine inlet temperature and compressor pressure ratio on system performance, and a 10% difference in efficiency among four simple PEMFC systems was predicted. Pressurization of the PEMFC with adequate thermal management may improve system efficiency, while efficiency enhancement from corresponding simple PEMFC systems was hard to achieve in the ambient pressure integrated systems.

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“…Proton exchange membrane (PEM) fuel cells have recently been considered for use as stationary power sources for residential and commercial buildings because of their potential to provide a clean, quiet, scalable and reliable supply of electricity, whilst also producing heat that may be recovered [1][2][3][4][5]. They are also being developed as uninterrupted power supply (UPS) systems for applications including mobile phone base stations [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Ripple Current in a 5 kW Polymer Electrolyte Membrane Fuel Cell Stack

Ladewig¹,

Lapicque²

2009

Fuel Cells

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Polymer electrolyte fuel cell systems are increasingly being used in applications requiring an inverter to convert the direct current (DC) output of the stack to an alternating current (AC). These inverters, and other time‐varying inputs to the stack such as the anode feed pressure, cause deviations from the average stack current, or ripple currents, which are undesirable for reasons of performance and durability. A dynamic fuel cell model has been developed and validated against experimental data for a 5 kW fuel cell stack, examining in detail the ripple current behaviour. It was shown that the ripple currents exceed the 2% maximum recommended value, and may lead to long‐term degradation of the fuel cell stack.

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Testing and model-aided analysis of a 2kWel PEMFC CHP-system

Cited by 28 publications

References 12 publications

Model‐Aided Testing of a PEMFC CHP System

Model‐Aided Testing of a PEMFC CHP System

Influence of thermal management and integration with turbomachinery on the performance of polymer electrolyte membrane fuel cell systems

Analysis of the Ripple Current in a 5 kW Polymer Electrolyte Membrane Fuel Cell Stack

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