This experimental paper presents a study of gas-liquid two phase flow in rectangular channels of 500μm x 45μm and 23.7mm long with different wall conditions of hydrophilic and hydrophobic surface, in order to investigate the flow structures and the corresponding friction factors of simulated microchannels of PEMFC. The main flow in the channel is air and liquid water is injected at a single or ...

PEM (Proton Exchange Membrane) fuel cells show characteristics of high power density, low operating temperature and fast start-up capability, which make them potentially suitable to replace conventional power sources (e.g. internal combustion engines) as Auxiliary Power Units (APU) for on-board applications. This paper presents a methodology for a preliminary investigation on either sizing and ...

Typically, improving data center availability requires designing in more infrastructure; the antithesis of reducing costs. Is there a way to cut infrastructure, cost and emissions while improving energy efficiency and server availability? We consider and evaluate the integration of fuel cells with IT hardware with various architectural designs, essentially collapsing the entire energy supply ch...

Recent trends and advances in hydrogen/air Proton Exchange Membrane Fuel Cells (PEMFC) are incorporated into a dynamic control oriented model. This type of model is important for development of control systems for PEMFC powered transportation where unpredictable and widely varying changes in power demand can be expected. Self humidification and low pressure operation are the two major changes t...

In this study, the newly designed bipolar plate for proton exchange membrane fuel cells (PEMFC) was produced by spray-coating the Ni65Cr15P16B4 metallic glassy alloy on Al plate. The Ni65Cr15P16B4 metallic glass was adopted as a coating material because of its excellent corrosion resistance and the high velocity oxy-fuel (HVOF) spray coating was used for the metallic glass deposition on the Al ...

This paper considers the effects of different types of faults on a model of a proton exchange membrane fuel cell (PEMFC). Using databases (which record the effects of the faults) and probabilistic methods (such as the Bayesian-Score and Markov Chain Monte Carlo), a graphical-probabilistic model for fault diagnosis is constructed. The graphical structure defines the cause-effect relationship amo...

To predict the remaining useful life (RUL) of proton exchange membrane fuel cell (PEMFC) in advance, a prediction method based on voltage recovery model and Bayesian optimization multi-kernel relevance vector machine (MK-RVM) is proposed this paper. First, empirical mode decomposition (EMD) was used to preprocess data, then MK-RVM train model. Next, algorithm optimize weight coefficient kernel ...

The present paper explores the impact of an on-board hydrogen harvesting system (fuel reformer) on the overall efficiency of a fuel-cell powered vehicle. Various methods of hydrogen production for automotive applications have been discussed first. As the hydrogen production is one of the major challenges for application of proton exchange membrane (PEM) fuel cells, especially in vehicular indus...

A better performance of photovoltaic (PV) generator is obtainedat high insolation. But at high insulation, the temperature of the PV system increases and leads to the drop down of the performance of the system making the system unable to supply the load. The problem becomes more difficult with irregular solar insolation, the system experience variation in his output, which is not good for the u...

This paper describes and demonstrates a new method for determination of current density distribution in an operating polymer electrolyte membrane ~PEM! fuel cell. The technique is a modification of the current mapping technique that relies on an array of shunt resistors embedded within a current collecting plate. Standard, nonaltered membrane electrode assemblies are utilized with gas diffusion...