الفهرس 
Hydrogen as an energy carrierOnly 14 pages are availabe for public view
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Abstract
An ultrasonic water electrolyzer system (UWES) was designed and constructed to produce hydrogen gas at Tractor and Farm Machinery Test and Research Station in Alexandria Governorate. The objectives of the present study were to: 1. Design and develope of an ultrasonic water electrolyzer system (UWES) for hydrogen production. 2. Determine the optimum conditions affecting the performance of the developed electrolyzer system. 3. Evaluate the performance of the developed electrolyzer system of ultrasonic system. 4. Use hydrogen in gasoline engines as a clean fuel. The performance of the ultrasonic water electrolyzer system was evaluated in terms of hydrogen production rate, energy requirement, energy production, electrolyzer efficiency and engine torque efficiency. The main results obtained from the experiments can be summarized under the following main headings: Hydrogen production rate: The results revealed that the number of cells increased hydrogen production rate with and without signal frequencies. Increasing the number of cells from 1 to 9 cells, increased hydrogen production rate from 0.02 to 0.10 m3/h, under without applying ultrasonic waveform. When using Sine, waveform increasing the number of cells from 1 to 9 cells, increased hydrogen production rate from 0.06 to 0.32, from 0.08 to 0.34 and from 0.07 to 0.31 m3/h at 20, 25 and 30 kHz respectively. Moreover, under triangular, waveform increasing the number of cells from 1 to 9 cells, increased hydrogen production rate from 0.08 to 0.36, from 0.09 to 0.39 and from 0.09 to 0.38 m3/h at 20, 25 and 30 kHz respectively. In addition, under square, waveform the increasing the number of cells from 1 to 9 cells, the hydrogen production rate can be increase from 0.07 to 0.34, from 0.08 to 0.39 and from 0.08 to 0.38 m3/h at 20, 25 and 30 kHz signal frequencies respectively. Effect of the waveform on hydrogen production rate: The results showed that, without any frequencies, the maximum hydrogen production rate was 0.10 m3/h. While hydrogen production rate increased from 0.32 to 0.34 m3/h at 20 and 25 kHz, respectively, under the sine wave, while decreased to 0.31 m3/h at 30 kHz. In addition, in the form of triangular waveform, the hydrogen production rate increased from 0.36 to 0.39 m3/h, at 20 and 25 kHz respectively, while decreased to 0.38 m3/h at 30 kHz. Moreover, under square waveform the energy requirements increased from 0.34 to 0.39 m3/h, at 20 and 25 kHz respectively while decreased to 0.38 m3/h at 30 kHz. Effect of the frequency on hydrogen production rate: The results demonstrated that, without signal frequencies the hydrogen production rate was 0.10 m3/h. While, at 20 kHz the hydrogen production rate increased from 0.32 to 0.36 m3/h, under sine waveform and triangular waveform respectively, while decreased to 0.34m3/h under square waveform. In addition, at 25 kHz the hydrogen production rate increased from 0.34 to 0.39 m3/h, under sine waveform and triangular waveform respectively, while decreased to 0.386 m3/h under square waveform. Moreover, at 30 kHz the hydrogen production rate increased from 0.31 to 0.38 m3/h, under sine waveform and triangular waveform respectively, while decreased to 0.375 m3/h under square waveform. Energy requirements: