presented by:
R. DHANDAYUTHABANI

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HYDROGEN ENERGY SYSTEM
WHY HYDROGEN ?
 Potentially an inexhaustible supply of energy
 Can be produced from several primary energy sources
 Reduced dependence on petroleum imports if produced from coal or renewables
 Potential environmental benefits
 High energy conversion efficiency by use of H2 in Fuel Cells(UPTO 90%) in place of I.C. engines (30-35%)
 Efficiency is high.Because no fuel is burned to make energy, fuel cells are fundamentally more efficient than combustion systems
Properties of Hydrogen
 Hydrogen gas is highly flammable
 It will burn in air at a very wide range of concentrations b/w 4% and 75% by volume
 Heating value - 12.1 MJ/cu m
 Less dense
 Hydrogen is a secondary energy resource, meaning it must be made from another fuel.
Science of Hydrogen Fuel Cells
 Two electrode ( cathode and anode) surrounds an electrolyte.
 Catalyst – platinum.(oxidization)
 It produce electrons and protons.
 Electrons – Produce electric energy.
 Protons combines with oxygen and produces water.
Science of Hydrogen fuel cells
Basic Issue.
 Production
 Storage
 Transportation
 Utilization
 Safety and management
 Economy
Production of Hydrogen
 Hydrogen can be produced from a wide variety of energy resources including:
 Fossil fuels, such as natural gas and coal
 Nuclear energy
 Renewable resources, such as solar,water, wind and biomass
Types of h2 processes
 categories of Hydrogen production
 Electrolysis process
 Thermal – chemical process
 Fossil- fuel Process
 Photo- electrolysis process
Electrolysis Process
 Defintion of Electrolysis:
* A chemical process in which bonded
elements and compounds are dissociated by the passage of electric current.
 Example:
Electrolysis of water
2H2O + energy = 2H2 + 2O2