نتایج جستجو برای: pem fuel cell
تعداد نتایج: 1740315 فیلتر نتایج به سال:
In this paper we study the performance of a PEM stack fuel cell after 900 hours of operation. We tried to identify any voltage degradation and its causes. Microscopic cracks on some parts of MEA mainly due to uniformity of pressure, stress concentration and elongation of membrane in the edge of GDL has been identified as the most important cause of this gradual degradation. High contact resista...
The recovery of waste heat from Proton Exchange Membrane (PEM) Fuel cell is sin qua non to the development organic Rankin cycle units. Despite appreciable increase in sale PEM fuel units 2021, some these typified by large fluctuations mass flow rate as well temperature which more likely affect overall performance an Rankine (ORC) unit when coupled a cell. It therefore imperative that dynamic mo...
Effect of clamping pressure on electrical resistance between Gas diffusion layer (GDL) and bipolar plate is a very important parameter in Proton exchange membrane (PEM) fuel cells. For investigation of this matter some researches have been done in these years. But there is not an experimental investigation of clamping pressure effect on PEM electrical resistance. In this paper, some experimenta...
To simulate a new economical architecture for PEM fuel cell and investigate the effectiveness of the introduced structure on the performance, computational fluid dynamics (CFD) code is used to solve the equations for a single domain of the cell namely: the flow field, the mass conservation, the energy conservation, the species transport, and the electric/ionic fields under the assumptions of st...
Transport phenomena within PEM fuel cells are investigated and a comprehensive analytical solution is presented. The methodology couples the transport within the fuel cell supply channels and the substrate which is composed of five different layers. The layers are all treated as macroscopically homogeneous porous media with uniform morphological properties such as porosity and permeability. The...
According to the declining trend of fossil fuel resources and the need to use renewable energies, appropriate research should be conducted for technical and functional studies in this regard. Therefore, in this research, a tubular PEM fuel cell as a suitable energy source with three-dimensional geometry has been numerically simulated and investigated. For a comprehensive study, the equations o...
In this paper, the dynamic model of a fuel processor for hydrogen production from steam reformation is first introduced. The fuel processor is built according to an integrated burner and reformer bi-catalyst plate configuration. The model is then coupled with the one of a PEM fuel cell, and the overall simulator is used to analyze different control configurations. It is shown that the limited d...
A fuel cell has been considered as an efficient and clean alternative power source for automobile industry since the energy crisis forced people to find a substitution for fossil fuels. A proton exchange membrane fuel cell, also known as polymer electrolyte membrane fuel cell (PEMFC), becomes a prime candidate for applications in vehicles because of its following features: the PEMFC operates at...
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