Investigation of temperature profile in high temperature PEM fuel cell

Download
index.pdf
2016
Çağlayan, Dilara Gülçin
Show full item record
405
views
191
downloads
High temperature polymer electrolyte membrane fuel cells (HT-PEMFC) are promising alternative energy sources for the future. As an advantageous tool in the design of a system, modeling requires less time compared to the experiments as well as its low cost. This study includes both isothermal and non-isothermal three-dimensional mathematical models for a HT-PEMFC having an active area of 25 cm2. Governing equations are solved by using Comsol Multiphysics 5.0 “Batteries & Fuel Cells” module, which is a commercial software package that solves partial differential equations by using finite element method. Temperature has a crucial role in the operation of HT-PEMFC because of the exothermic reaction taking place at the catalyst layer. Influence of the temperature on the performance is studied for a single channel and triple mixed serpentine geometry with an isothermal model. It is seen that the fuel cell performance is enhanced as the operation temperature increases due to enhanced reaction kinetics and increased proton conductivity of PBI membrane. Higher proton conductivity yields in a decrease in the ohmic losses of the cell. The temperature distribution within the cell is obtained with a non-isothermal three-dimensional model. There is an increase in the temperature approximately 0.31 ᵒC at the operation voltage of 0.45 V, this value lowers at higher operation voltages. It is concluded that exothermic reaction in the cathode catalyst layer does not have a significant effect on the temperature; therefore, isothermal assumption is valid for the system.
Fuel cells., Electrolytes., Fuel cells, Electrolytes
http://etd.lib.metu.edu.tr/upload/12620157/index.pdf
https://hdl.handle.net/11511/25777
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Development of 500 W PEM fuel cell stack for portable power generators
DEVRİM, YILSER; Devrim, Huseyin; Eroğlu, İnci (2015-06-29)
Polymer Electrolyte Membrane Fuel Cell (PEMFC) portable power generators are gaining importance in emergency applications. In this study, an air-cooled PEMFC stack was designed and fabricated for net 500 W power output. Gas Diffusion Electrodes (GDE's) were manufactured by ultrasonic spray coating technique. Stack design was based on electrochemical data obtained at 0.60 V was 0.5 A/cm(2) from performance tests of a single cell having the same membrane electrode assemblies (MEA) that had an active area of 1...
Numerical investigation of a stand alone solar hydrogen energy system effects of PEFC degradation
Ender, Ozden; Tarı, İlker (null; 2015-08-12)
An existing stand-alone solar energy system producing hydrogen for energy storage is numerically investigated focusing on the degradation of Polymer Electrolyte Fuel Cell (PEFC) and its effects on the overall performance of the system. The system consists of Photovoltaic (PV) panels, polymer electrolyte based electrolyzers, H2 and O2 storage tanks and a commercial PEFC stack. A PEFC is numerically investigated both as new and as degraded (for about two years). Using a variety of observed degradation pattern...
MODELING OF BIPOLAR PLATES FOR PROTON EXCHANGE MEMBRANE FUEL CELLS
Ekiz, Ahmet; Camci, Talha; Turkmen, Ibrahim; SANKIR, MEHMET; USLU, SITKI; Baker, Derek Keıth; Agar, Ertan (2011-09-01)
Fuel cell technology is one of the most economic and efficient ways to utilize hydrogen energy. Various types of fuel cells are present regarding the fuel type and amount of power produced. Among these, proton exchange membrane fuel cells (PEMFCs) are very promising. In this work, a 2D proton exchange membrane fuel cell unit cell was modeled using Comsol Multiphysics software. Cell section was taken parallel to flow direction. Obstacles with various geometries were placed in the flow channel in order to for...
Combinatorial development of LSC-113/LSC-214 cathode materials for intermediate temperature solid oxide fuel cells
Sarı, Doğancan; Öztürk, Tayfur; Kalay, Yunus Eren; Department of Metallurgical and Materials Engineering (2017)
Solid oxide fuel cells are environmentally friendly, efficient and fuel versatile energy conversion devices which suffer from high operating temperatures. For lowering the operating temperatures of solid oxide fuel cells (SOFC), LSC-113/LSC-214 composite cathodes have recently attracted much attention due to their enhanced kinetics. However, the full potential of this novel system is still unknown. In this study, a combinatorial approach was used to develop cathode materials which would reduce operating tem...
Modeling of a high temperature PEM fuel cell
Sezgin, Berna; Eroğlu, İnci; Devrim, Yılser; Department of Chemical Engineering (2016)
High temperature polymer electrolyte membrane fuel cells (HT-PEMFC) are considered as the next generation of fuel cells since high temperature operation for PEM fuel cells has several advantages such as single phase operation, high carbon monoxide tolerance, low or zero carbon emission and removal of some equipment from the system. In order to obtain high performances, HT-PEMFC systems should be optimized in terms of dimensions, materials, operating conditions and other parameters. Modeling can help to pre-...
Citation Formats
D. G. Çağlayan, “Investigation of temperature profile in high temperature PEM fuel cell,” M.S. - Master of Science, Middle East Technical University, 2016.
METU IIS - Integrated Information Service open@metu.edu.tr