hydrogen fuel cells & energy efficiency by: claudio bolzoni david carlos echeverria andres...
TRANSCRIPT
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HYDROGEN FUEL CELLS
&ENERGY EFFICIENCY
By:Claudio Bolzoni
David Carlos EcheverriaAndres Segura
Dari Seo
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FUEL CELLS
• Definition: electrochemical cell that converts a source fuel into an electri-cal current.
• The fuel cell generates electricity through reactions between a fuel and an oxidant.
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Hydrogen Fuel Cells
• A hydrogen fuel cell uses hydrogen
as its fuel and oxygen as its oxidant.
• Its very similar to a battery but it has
its differences.
• Discovered by Christian Firedrich
Schönbien in 1838
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Bene-fits•Reduction in burn-ing of fuel cells•Improvement of air quality especially in urban areas•Reduction of greenhouse gases (global warming)•Low noise and high power•Reduction in en-ergy consumption (saving energy)
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Prob-lems•Cost
•Durability
•Hydration
•Delivery
•Infrastructure
•Storage
•Safety
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Examples
•Vehicles
•Bicycles
•Rockets
•Airplanes
•Buses
•Motorcycles
•Scooters
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Hydrogen Automobile
• An alternative fuel vehicle which uses hydrogen as its fuel.
• Chemical energy in hydrogen is con-verted into mechanical energy.
• Funding comes from both private and government sources.
• Cost around $400,000.• "It's still a ways away from commer-
cialization"
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BENEFITS• Reduce greenhouse gases• Reduce dependency on oil• Technological development
PROBLEMS• Expensive• Needs hydrogen gas stations• "A hydrogen car is one of the least effi-
cient, most expensive ways to reduce greenhouse gases.“ U.S Department
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Ford edge hybrid-2007
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The Evolution, General Motors
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Hydrogen Rocket
BENEFITS• Highest effective exhaust velocity• Lower weight• Velocity change (lift off weight is
less)• Works well in upper stages
PROBLEMS• Low density, needs insulation
(weight)
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Efficiency• Dependent on the amount of power drawn
from the fuel cell• For a hydrogen cell operating at standard con-
ditions with no reactant leaks, the efficiency is equal to the cell voltage divided by 1.48 V, based on the reaction.
• The more current drawn, the lower the effi-ciency
• The efficiency of a cell is almost proportional to its voltage.
• Do not operate in thermal cycle
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Video Link
• www.auto.howstuffworks.com/fuel-efficiency/alternative-fuels/fuel-cell.html