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dpurdy

HowStuffWorks "How the Hydrogen Economy Works" - 3 views

auto.howstuffworks.com/...hydrogen-economy4.htm

fuel cell form convert

shared by dpurdy on 03 Nov 11 - No Cached
  • In the hydrogen economy, there is no storehouse to tap into. We have to actually create the e­nergy in real-time.
  • There are two possible sources for the hydrogen: Electrolysis of water - Using electricity, it is easy to split water molecules to create pure hydrogen and oxygen. One big advantage of this process is that you can do it anywhere. For example, you could have a box in your garage producing hydrogen from tap water, and you could fuel your car with that hydrogen. Reforming fossil fuels - Oil and natural gas contain hydrocarbons -- molecules consisting of hydrogen and carbon. Using a device called a fuel processor or a reformer, you can split the hydrogen off the carbon in a hydrocarbon relatively easily and then use the hydrogen. You discard the leftover carbon to the atmosphere as carbon dioxide.
  • To have a pure hydrogen economy, the hydrogen must be derived from renewable sources rather than fossil fuels so that we stop releasing carbon into the atmosphere. Having enough electricity to separate hydrogen from water, and generating that electricity without using fossil fuels, will be the biggest change that we see in creating the hydrogen economy.
  • ...2 more annotations...
  • In the future, barring some technological breakthrough, it seems likely that one of two things will happen to create the hydrogen economy: Either nuclear-power or solar-power generating capacity will increase dramatically.
  • The electrical-generation problem is probably the biggest barrier to the hydrogen economy
dpurdy

How does an electrical generator work? - 0 views

www.sommersgen.com/...about-generators.php

convert

shared by dpurdy on 25 Mar 13 - No Cached
  • Electric generators are essentially coils of electric conductors, usually copper wire, that are tightly wound onto a metal core and are mounted to spin around inside an array of large magnets
  • the copper conductor can spin at very high speeds through the magnetic field, producing a powerful flow of electricity. The same principle applies whether the generator is driven by a bicycle wheel, a tractor engine or a steam turbine.
dpurdy

Discovery Kids :: Tell Me - How does a generator work? - 0 views

kids.discovery.com/...how-does-a-generator-work

fossil fuels convert fossil

shared by dpurdy on 19 Mar 13 - No Cached
  • . It does this by using a magnet that forces electrons to move along a wire at a steady rate while putting pressure on them.
dpurdy

Why a hydrogen economy doesn't make sense - 0 views

phys.org/news85074285.html

fuel cell form

shared by dpurdy on 24 Mar 13 - No Cached
  • dpurdy on 24 Mar 13
     
    How inefficient it is to make hydrogen from electricity
dpurdy

How Wind Works | Wind Energy Foundation - 0 views

www.windenergyfoundation.org/...how-wind-works

wind form

shared by dpurdy on 24 Mar 13 - No Cached
  • Wind is simply air in motion. It is caused by the uneven heating of the Earth's surface by the sun. Because the Earth's surface is made of very different types of land and water, it absorbs the sun's heat at different rates. One example of this uneven heating can be found in the daily wind cycle.
  • Mechanical or electrical power is created through the kinetic energy of the wind.
dpurdy

Nuclear Industry Withers in U.S. as Wind Pummels Prices - Bloomberg - 0 views

www.bloomberg.com/...ind-pummels-prices-energy.html

wind cost

shared by dpurdy on 24 Mar 13 - No Cached
  • The wind power boom has benefited consumers in regions where wind development is fastest, contributing to a 40 percent wholesale power-price plunge since 2008
  • U.S. wind installations have risen 10-fold since 2003 to 60,007 megawatts,
dpurdy

Wind turbine - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Wind_turbine

wind history

shared by dpurdy on 24 Mar 13 - Cached
  • The first electricity-generating wind turbine was a battery charging machine installed in July 1887 by Scottish academic James Blyth to light his holiday home in Marykirk, Scotland.[7
dpurdy

Geothermal Energy and Global Warming - 0 views

www.envirocitizen.org/...1008.html

geothermal sustainable

shared by dpurdy on 24 Mar 13 - No Cached
  • While geothermal energy itself is renewable, geothermal sites are not necessarily. An overworked site, or one with an excessively large energy plant, can quickly be depleted.
  • dpurdy on 24 Mar 13
     
    Great Point!!
dpurdy

HowStuffWorks "Do wind turbines kill birds?" - 0 views

science.howstuffworks.com/...wind-turbine-kill-birds.htm

wind pollution

shared by dpurdy on 24 Mar 13 - No Cached
  • dpurdy on 24 Mar 13
     
    Do wind generators kill birds?
dpurdy

Energy - Ocean and Wave - 0 views

renet-eu-india.com/energywave.php

wave form

shared by dpurdy on 23 Mar 13 - No Cached
  • More than 70% of Earth's surface is covered by oceans which contain two types of energy: mechanical energy from waves and tides and Thermal energy from solar radiations falling on the ocean surface making them the world's largest solar collectors
dpurdy

How Does CO2 Cause Global Warming? | eHow.com - 0 views

www.ehow.com/1_co-cause-global-warming.html

global warming co2 fossil fuels pollution

shared by dpurdy on 23 Mar 13 - No Cached
  • Carbon dioxide contributes to global warming by absorbing heat energy from the earth, trapping it and preventing its release into space.
dpurdy

Global Warming And Your Car | Car Talk - 0 views

www.cartalk.com/...global-warming-and-your-car-0

cost fossil fuels

shared by dpurdy on 23 Mar 13 - No Cached
  • Burning one gallon of gas creates 20 pounds of carbon dioxide, and the average car emits about six tons of carbon dioxide every year
  • So... let's accept that global warming is caused by greenhouse gasses, chief among them carbon dioxide. Cars emit carbon dioxide as part of their emissions...
ricciardellinick

Fuel Cell Technology Showcase - History of Fuel Cells - 0 views

www.sae.org/...fuelcells-history.htm

fuel cell fuel cell form

shared by ricciardellinick on 22 Mar 13 - No Cached
  • ricciardellinick on 22 Mar 13
     
    "History of Fuel Cells"
whalenkil98

Institute for Energy Research | Fossil Fuels - 1 views

www.instituteforenergyresearch.org/...fossil-fuels

energy fossil fuels fossil fuel

shared by whalenkil98 on 22 Mar 13 - No Cached
  • Scattered records of the use of coal date to at least 1100 BC.
barnardnat99

U.S. Installed Record 13.2 Gigawatts Of Wind Energy In 2012 - Forbes - 0 views

www.forbes.com/...gawatts-of-wind-energy-in-2012

wind

shared by barnardnat99 on 22 Mar 13 - No Cached
  • With a key federal tax incentive about to expire, the U.S. installed a 5.5 gigawatts of wind power in December to cap off a year that saw a record 13.2 gigawatts of wind energy come online, according to a report released Friday by research firm Bloomberg New Energy Finance. The U.S. now boasts a total of 60 gigawatts of wind energy, accounting for 6% of the nation’s total generating capacity. According to Bloomberg New Energy Finance, wind power prices have dropped more than 21% since 2010. Falling prices and the looming expiration of the production tax credit, which pays a premium for wind energy, unleashed a wind farm building boom last year. “It’s clear that the economics, aided by the PTC, drove wind growth in 2012,” Amy Grace, a wind analyst with Bloomberg New Energy Finance, said in a statement. “Eleven gigawatts of capacity was built in states without any near-term state mandated demand.
barnardnat99

Energy Report: U.S. Wind Energy Production and Manufacturing Surges, Supporting Jobs an... - 0 views

www.doe.gov/...ing-surges-supporting-jobs-and

shared by barnardnat99 on 22 Mar 13 - No Cached
  • The report finds that in 2011, roughly 6,800 megawatts (MW) of new wind power capacity was added to the U.S. grid, a 31 percent increase from 2010 installations.  The United States’ wind power capacity reached 47,000 MW by the end of 2011 and has since grown to 50,000 MW, enough electricity to power 13 million homes annually or as many as in Nevada, Colorado, Wisconsin, Virginia, Alabama, and Connecticut combined. The country’s cumulative installed wind energy capacity grew 16 percent from 2010, and has increased more than18-fold since 2000.  The report also finds that six states now meet more than 10 percent of their total electricity needs with wind power.
mchughkon99

Directory:Cents Per Kilowatt-Hour - PESWiki - 0 views

peswiki.com/...ectory:Cents_Per_Kilowatt-Hour

fossil fuels cost

shared by mchughkon99 on 22 Mar 13 - No Cached
  • GasCurrently supplies around 15% of the global electricity demand. 3.9 - 4.4 Cents/kW-h Gas-fired plants and generally quicker and less expensive to build than coal or nuclear, but a relatively high percentage of the cost/KWh is derived from the cost of the fuel. Due to the current (and projected future) upwards trend in gas prices, there is uncertainty around the cost / KWh over the lifetime of plants. Gas burns more cleanly than coal, but the gas itself (largely methane) is a potent greenhouse gas. Some energy conversions to calculate your cost of natural gas per kwh. 100 cubic feet (CCF)~ 1 Therm = 100,000 btu ~ 29.3 kwh. CoalCurrently supplies around 38% of the global electricity demand. 4.8 - 5.5 Cents/kW-h Increasingly difficult to build new coal plants in the developed world, due to environmental requirements governing the plants. Growing concern about coal fired plants in the developing world (China, for instance, imposes less environmental overhead, and has large supplies of high sulphur content coal). The supply of coal is plentiful, but the coal generation method is perceived to make a larger contribution to air pollution than the rest of the methods combined. NuclearCurrently supplies around 24% of the global electricity demand. 11.1 - 14.5 Cents/kW-h Political difficulties in using nuclear in some nations. Risk of widespread (and potentially lethal) contamination upon containment failure. Fuel is plentiful, but problematic. Waste disposal remains a significant problem, and de-commissioning is costly (averaging approximately US $320MM per plant in the US).
  • mchughkon99 on 22 Mar 13
     
    cost for fossil fuels
lefebvrekat99

biofuel - Dpurdy on Diigo - 0 views

www.diigo.com/...biofuel

current biofuels

shared by lefebvrekat99 on 22 Mar 13 - No Cached
  • First generation biofuel are those fuel derived from vegetable or animal fats/oils, starch or sugar with the use of modern technology. 1. Let the base organic material (corn, sugarcane, wheat, etc) pass through a grinding meal to pulverize the selected material. 2. Then, liquefy it by placing the blend of water, grain powder and an enzyme that facilitates the breakdown of the grain compound into a high-heat cooker. 3. Cool it afterwards. Add another enzyme that will facilitate the conversion of starch into sugars which are then fermented, producing alcohol from the cooled mash. 4. Start the fermentation by adding yeast to the sugar mixture. The sugars will be broken down to ethanol (a form of alcohol) and carbon dioxide. 5. Distill the fermented mixture in order for the ethanol to separate from the solids. 6. Get rid of the water from the separated ethanol through a dehydration process.
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