As a part of ongoing research into the use of fuel cells to power underwater platforms, studies have been conducted to investigate the effect of change in oxygen flow through the proton exchange membrane fuel cell (PEM-FC) cathode channel, to develop a method for controlling this flow. Due to the lack of specific information or studies on the effect of pure oxygen flow through the PEM-FCs cathode channel on the correctness of its work, a series of experiments have been carried out within the framework of in-house research to determine this dependence. The experiment was conducted in series, during which the only change in the operating parameter of the PEM-FC stack was the stoichiometric flow rate of oxygen supplied to the cathode channel of the fuel cells' stack. The research shows that for the PEM-FCs stack fed with pure oxygen, the cathode stoichiometry can be kept at a much lower level comparing to the systems supplied with air. It has been found that the fuel cells' stack fed with pure oxygen will perform well in steady state while reducing the cathode stoichiometry by as much as 40% compared to systems utilising oxidant from atmospheric air.
This article is focused on the calibration of digital multimeters, in which the concept and practical solutions for stations with software for automatic calibration are presented. This paper also presents the general structure of the measuring system, the application scheme, and the technical implementation of measuring stations, together with the software.
This article consists of research results regarding the use of energy profiles, as a tool for the configuration of offshore floating platforms' hybrid power supply system. Given solution supports renewables, as a platform's exploitation economy improvement. As a main current source in the proposed system, a fuel cell with high energy density to mass ratio (Wh/kg) is provided; however, it has disadvantages regarding its dynamic response during the load changes. The proposed solution minimises the disadvantages of the fuel cell by designing a hybrid system consisting few energy sources and storages with a logic system to control its elements. In order to optimise the hybrid system's configurations the author's concept has been applied. This concept models the set of energetic and dynamic characteristics called the energy profile in the considered floating platform's electric loads. Use of energy profiles in the system's configuration process allows minimisation of its size with constant power availability in all the floating platform's exploitation states.
Abstract. Proton exchange membrane (PEM) fuel cells characterized the highest available current density of electricity, but their construction uses elements, which generate noise, vibration and requires the dissipation of heat. Emitting these physical fields into the environment from this type of power sources is a disadvantage due to the low detection requirements of military installations as well as operator safety. The paper presents the study of noise and vibration exposure users of 20 Watt PEM fuel cell users.
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