EVPP 111 Lecture - Energy - Renewable Energy - Hydrogen fuel cell and energy conservation - Student

EVPP 111 Lecture - Energy - Renewable Energy - Hydrogen fuel cell and energy conservation - Student

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Unformatted text preview: Energy: Renewable Energy – Hydrogen Fuel Cell AND Energy Conservation EVPP 111 Lecture EVPP Energy Energy 3 Renewable energy Renewable 3 Hydrogen fuel cell Hydrogen Energy Conservation Energy Energy: Renewable Energy Energy: 3 Renewable energy types 3 Hydrogen fuel cell Hydrogen 3 what it is 3 hydrogen as “fuel” 3 fuel cell enables production of electricity “ondemand” Energy: Renewable Energy Energy: 3 Renewable energy types 3 Hydrogen fuel cell Hydrogen 3 What it is 3 Where does hydrogen for fuel come from? 3 3 3 Water via electrolysis 2H2O n 2H2 + O2 2H È 3 Requires input of electricity Requires Where does the electricity come from? 3 any source; ideally, renewables Energy: Renewable Energy Energy: 3 Renewable energy types 3 Hydrogen fuel cell 3 What it is 3 How does fuel cell enable production of electricity “ondemand” 3 Reverse electrolysis reaction 3 * 2H2 + O2 n 2H2O È 2H 3 3 3 3 * Requires help of chemical catalyst Requires * Generates electricity * H electrons flow from one electrode to another * Only waste/emission is water A typical hydrogen fuel cell typical Energy: Renewable Energy Energy: 3 Renewable energy types 3 Hydrogen fuel cell Hydrogen 3 advantages Energy: Renewable Energy Energy: 3 Renewable energy types 3 Hydrogen fuel cell Hydrogen 3 disadvantages A hydrogen-fueled bus hydrogen-fueled Energy Energy 3 Renewable energy Renewable 3 Hydrogen fuel cell Hydrogen Energy Conservation Energy Energy: Conservation Energy: 3 Energy conservation 3 3 Decrease in energy use by reduction in unnecessary Decrease waste waste Improve energy efficiency 3 Energy efficiency 3 Measure of amount of work obtained from each unit of energy used Energy: Conservation Energy: 3 Wasteful use of energy 3 ~84% of all commercial energy in US is wasted 3 some unavoidably 3 ~41% - due to 2nd law thermodynamics ~43% 3 some unnecessarily 3 3 why are we so wasteful? 3 ample supplies of low-cost fossil fuels 3 Cost is low because environmental costs not included Energy: Conservation Energy: 3 Energy conservation 3 Four least energy-efficient devices 3 incandescent light bulb 3 wastes ~90-95% of energy 3 vehicles with internal combustion engines 3 wastes ~94% of energy in its fuel 3 nuclear power plants 3 wastes ~83-92% of energy in fuel 3 coal-fired power plants 3 wastes ~75-80% of energy in fuel Energy: Conservation Energy: 3 Energy conservation 3 Get rid of “outdated 4” 3 incandescent light bulb 3 replace with compact fluorescent and LED lights 3 vehicles with internal combustion engines 3 replace with electric cars, fuel cell cars if electricity is replace generated by renewables generated nuclear power plants 3 replace with combination of wind, solar, improved replace efficiency in buildings and appliances efficiency coal-fired power plants 3 replace with combination of wind, solar, improved replace efficiency in buildings and appliances efficiency 3 3 Energy: Renewable Energy Energy: 3 Energy conservation 3 in homes/buildings 3 Use energy-efficient lighting 3 3 Compact fluorescent LED Energy: Renewable Energy Energy: 3 Energy conservation 3 in homes/buildings 3 Use energy-efficient windows Energy: Renewable Energy Energy: 3 Energy conservation 3 in homes/buildings 3 Insulate well, plug leaks Energy: Renewable Energy Energy: 3 Energy conservation 3 in homes/buildings 3 Heat water more efficiently On-demand hot water heater Energy: Renewable Energy Energy: 3 Energy conservation 3 in homes/buildings 3 3 Use energy efficient appliances Current program under scrutiny Current (see 4/1/10 article at http://www.marketwatch.com/story/energy-star-program-is-under-fire-2010-04-0 http://www.marketwatch.com/story/energy-star-program-is-under-fire-2010-04) Energy: Renewable Energy Energy: 3 Energy conservation 3 Vehicles/transportation 3 Improve fuel-efficiency 3 Legislation 3 New standards (effective 2012-20216) announced 4/1/10 ( New Reduce weight n Hybrids È Hybrids n Fuel-cells È Fuel-cells n electric cars È electric http://www.huffingtonpost.com/2010/04/01/fuel-efficiency-new-stand_n_521 ) 3 3 3 3 Energy: Renewable Energy Energy: 3 Energy conservation See US EPA website ( http://www.epa.gov/greenkit/q5_energ.htm ) for overview of conservation strategies overview The End The ...
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