Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Numerical investigation of a stand alone solar hydrogen energy system effects of PEFC degradation
Date
2015-08-12
Author
Ender, Ozden
Tarı, İlker
Metadata
Show full item record
Item Usage Stats
261
views
0
downloads
Cite This
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 patterns reported in the literature, the degraded PEFC is parametrically analyzed by using ANSYS Fluent. The investigated parameters are the membrane equivalent weight, the Catalyst Layer (CL) porosity and viscous resistance, the Diffusion Layer (GDL) porosity and viscous resistance, and the bipolar plate contact resistance. By comparing the simulation results for the new and the degraded fuel cells, it is concluded that the effects of overall degradation on cell potential is significant -- being about 20% around the operating point of the fuel cell. This degraded fuel cell is incorporated into the TRNSYS model of the energy system, and then the effects of the PEFC degradation on the performance of the energy system are estimated. It is observed that the degradation has substantial impact on the overall system performance. System down time of approximately one month is possible. Thus, the stand-alone system is not capable of operating continuously for a complete year when the polymer electrolyte based components are degraded.
Subject Keywords
Polymer Electrolyte Fuel Cells
,
Fuel Cell degradation
,
Solar Energy
URI
https://hdl.handle.net/11511/86020
DOI
https://doi.org/10.1615/TFESC1.ecv.012787
Conference Name
1st Thermal and Fluid Engineering Summer Conference, TFESC, 9 - 12 Ağustos 2015
Collections
Department of Mechanical Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
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...
Investigation of temperature profile in high temperature PEM fuel cell
Çağlayan, Dilara Gülçin; Eroğlu, İnci; Devrim, Yılser; Department of Chemical Engineering (2016)
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 commer...
Numerical modeling of visco-elasto-plastic hygro-thermal stresses and the effects of operating conditions on the mechanical degradation of PEFC membranes
Mehrtash, Mehdi; Tarı, İlker; YEŞİLYURT, SERHAT (2018-08-31)
Durability of membranes is one of the concerns for widespread commercialization of polymer electrolyte fuel cells. Effects of membrane swelling on the durability pose important challenges for the fabrication of the catalyst-coated membrane. This study provides insight into vulnerable locations of the membrane under hygrothermal loading, mechanical loading due to clamping and realistic conditions where a combination of both of these loadings are imposed. With a half rib-channel model, we simulate a polymer e...
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...
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...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
O. Ender and İ. Tarı, “Numerical investigation of a stand alone solar hydrogen energy system effects of PEFC degradation,” New-York, Amerika Birleşik Devletleri, 2015, p. 673, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/86020.