In the era of rapid growth of renewable energy sources, storing surplus energy is rapidly gaining importance. One of the options as energy carrier is also hydrogen obtained by using water electrolysis. The hydrogen is then stored and, if necessary, converted back into energy with fuel cells or thermal engines, or it is consumed in other sectors. To gain a deeper understanding of the process and to explore potential improvements, experiments and measurements are performed on laboratory demonstrators. In this thesis, focus is placed on the laboratory PEM electrolyzer and the pressure cylinder in which the produced hydrogen is stored. By measuring changes in pressure and temperature, the mass flow of hydrogen is determined. By measuring the electric current and voltage, we were able to calculate the efficiency of the electrolyzer at different pressure, temperature and load conditions, as well as the amount of saturated water vapor in the pressure cylinder. Obtained results were compared with the scientific literature.
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