The working principle of an internal combustion engine, in general, is to convert chemical energy from liquid fuels to mechanical energy. The type of fuel commonly used by internal combustion engines is fossil fuel, which until now has been increasing in use while its supply is running low. The presentstudy is to conduct research in the field of new and renewable energy as an alternative fuel to replace fossil fuels. Hydrogen is a new form of energy carrier that could be obtained through the process of water electrolysis and is a promising fuel supplement in the future. Hydrogen production through the electrolysis process continues to be develop to help use environmentally friendly fuels and can have a positive impact on engine performance and exhaust emissions. However, to produce consistent and quality HHO gas output, the current HHO gas generator still needs tobe improved especially for the production volume. The purpose of this research will be directed to the development of the effective electrode plate system in producing HHO gas. In order to improve the quality and volume of HHO gas production, it was found that the level of surface roughness and the contact angle of the material should be increased through grinding and polishing processes. In this research, various SS316L electrode plates with different surface roughness were made for the analysis of HHO gas production to match the expected volume of HHO gas production. Various conditions of surface roughness of the electrode plate are carrying out by grinding and polishing the surfaces of both sides of the electrode plate to a uniform roughness level.

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An attempt to enhance the germination of green bell pepper has been tried by using dry processing non thermal (cold) argon plasma treatment. As an emerging non thermal technology, cold plasma could be used to give a pretreatment to a thermal-sensitive material, such as pretreatment to seeds of bell pepper prior to be planted in soil to understand the effect of this dry process during the germination period. In this experiment, the used argon plasma was generated by flowing argon gas with the rate of 2 L/min through a positively charged of stainless pipe at a distance of 15 mm from aluminum plate electrode. With an applied voltage of 9.8 kV (peak-to-peak) electrical energy from a high voltage AC power supply, argon plasma irradiation was employed to the bell pepper seeds for a predetermined period of time as pretreatment to the seeds during pre-planting. It was found that the temperature of the plasma never exceeded 35°C during the plasma irradiation to assure that no thermal damage occurred to the seeds. It was also confirmed from this study that by giving non thermal plasma treatment for 30 minutes to the seeds may enhance the germination of the bell pepper plants up to 90% in stem length and almost 2.5 times in root length compared to the pepper without treatment.

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