The excessive use of fossil fuels and the resultant dramatic increase in pollution levels have highlighted the need for a new sustainable and environmentally friendly fuel. Hence, it is necessary to research alternatives to reduce the use of fossil fuels and the emission of greenhouse gases. Utilising oxyhydrogen (HHO) gas has been proven to achieve high engine power output and efficiency with low emissions for spark-ignited internal combustion engines. HHO gas is generated from the electrolysis of water. This paper reviews the recent research findings related to the influencing factors on the production of HHO gas using alkaline water electrolysis involving electrolyte properties, electrolyte concentration, the distance between electrolytes, and the effects of HHO gas on the engine performance and gas emissions. Using an HHO gas blend in a diesel/gasoline engine could be a viable option for lowering GHG emissions and increasing engine efficiency.
The effectiveness generation of HHO gas depends on the characteristic of the electrode plates. This research aims to investigate the effect of the HHO gas generator produced through the water electrolysis technique. The effect of several controlled factors, such as the number, distance, and area of electrode plates used in the water electrolysis process to produce HHO gas, were studied and analyzed using a factorial full design approach (RBFAD). Stainless Steel of 1 mm thickness has been chosen as an electrode plate material. A single-cylinder four-stroke S.I. engine was used as the test engine. The engine was tested at 16 different setups where the engine speed and exhaust emission of carbon monoxide (CO) and hydrocarbon (HC) gasses were recorded. The statistical significance of these controlled factors contributing to the engine performance and exhaust emission has been established with the analysis of variance. It was found that the number of plates that interacted with a large area of electrode plate is a significant factor that caused an increase in engine speed on an average of 26%, an average reduction in CO by 43%, and a decrease in HC gas by 42%. In conclusion, the higher number of electrode plates and a higher electrode plate area produced more HHO gas that yields completed internal combustion. Thus, it can enhance the engine speed and reduces the CO and HC gas content in exhaust emissions.
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