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Energy-conversion efficiency for producing oxy-hydrogen gas using a simple generator based on water electrolysis.

Ahmed M Mousa1, Hassan A A Sayed1, Khaled A M Ali2

  • 1Department of Agricultural Machinery and Power Engineering, Faculty of Agricultural Engineering, Al-Azhar University, Cairo, 11751, Egypt.

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|October 25, 2024
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Summary

Efficient hydrogen production via water electrolysis can reduce fossil fuel use and combat global warming. This study optimized oxy-hydrogen/hydroxy (HHO) gas generator performance by adjusting voltage and KOH concentration for maximum efficiency.

Keywords:
HHO generatorHydrogen fuelOxy-hydrogenRenewable energyWater electrolysis

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Area of Science:

  • Electrochemistry
  • Renewable Energy Technologies

Background:

  • Water electrolysis offers a sustainable route to hydrogen production, crucial for reducing fossil fuel dependency and mitigating climate change.
  • Oxy-hydrogen/hydroxy (HHO) gas generators utilize electrolyzing techniques for on-demand hydrogen generation.
  • Optimizing HHO gas generator performance is key to unlocking its potential as a clean energy source.

Purpose of the Study:

  • To investigate the impact of applied voltage and electrolyte concentration on HHO gas generator performance.
  • To determine the optimal operating conditions for maximizing HHO gas production rate and generator efficiency.
  • To identify the lowest specific energy consumption for efficient HHO gas generation.

Main Methods:

  • A dry fuel cell-based water electrolyzer was used to generate HHO gas.
  • Applied voltage was varied between 10.5 V and 13.0 V.
  • Electrolyte solution concentration (KOH) was tested from 0.05 M to 0.20 M.

Main Results:

  • HHO gas production rate, power consumption, and electrolyte temperature increased with higher applied voltage and KOH concentration.
  • Optimal conditions were identified as 11.5–12.0 V and 0.05–0.10 M KOH for lowest specific energy and highest efficiency.
  • At 12.0 V and 0.10 M KOH, the generator achieved a productivity of 343.9 cm³ min⁻¹, specific energy of 3.43 kW h m⁻³, and efficiency of 53.79%.

Conclusions:

  • Applied voltage and electrolyte concentration significantly influence HHO gas generator performance.
  • The study provides clear guidelines for optimizing HHO gas production for various applications.
  • The energy required for HHO gas generation can be sourced from renewable energy, enhancing its environmental benefits.