Energy Power shift to ELECTRON ECONOMY: Jumpstart of Global Economy

ENERGY INFRASTRUCTURE for the Earth

It seems like every day there is a new announcement in the news about automobiles powered by fuel cells. The promises are tantalizing, since fuel cells have the potential to very quickly double the efficiency of cars while significantly reducing air pollution.

But what about Data Centers where all your photos, facebook messages, iCloud Data, music from Itunes and Amazon. They are all using large electric power.

HYDROGEN ECONOMY SHIFTING FROM FOSSIL ECONOMY:


These two forces are leading the world toward what is broadly known as the hydrogen economy. If the predictions are true, over the next several decades we will all begin to see an amazing shift away from the fossil fuel economy we have today toward a much cleaner hydrogen future.

I wonder then how we will create a new economic paradigm when our middle east brothers are confronted with dwindling if not vanishing income from fossil economy. I still believe that oil dependence from a finite source is not sustainable on the long haul.
Can society actually make this shift, or will the technological, economic and political barriers keep us bound to petroleum and other fossil fuels for the next century an­d beyond? We will also explore some of the technology in the market today and possibly the future:

 Here are some of the advantages going to Hydrogen economy:

• There are obvious advantages on shifting towards Hydrogen economy:  First thing that comes to mind is the elimination of polluting air from petrol and cars. Hydrogen when used in cars run by fuel cell, its by-product is water. It is considered clean technology.
• Hydrogen adds no greenhouse gases to the environment. Electrolysis source of hydrogen and when combined with oxygen to create water and power in fuel cell.
• Economic dependence on the middle east oil.
• There are simple technology that could be derived for distributed production of Hydrogen

Debates and insightful brainstorming must be encourage, as we all inhabitants face this dilemma of sharing resources: Sustainable Energy and Clean Water.



A wasteful process

In his study, Bossel analyzes a variety of methods for synthesizing, storing and delivering hydrogen, since no single method has yet proven superior. To start, hydrogen is not naturally occurring, but must be synthesized.

“Ultimately, hydrogen has to be made from renewable electricity by electrolysis of water in the beginning,” Bossel explains, “and then its energy content is converted back to electricity with fuel cells when it’s recombined with oxygen to water. Separating hydrogen from water by electrolysis requires massive amounts of electrical energy and substantial amounts of water.”

Also, hydrogen is not a source of energy, but only a carrier of energy. As a carrier, it plays a role similar to that of water in a hydraulic heating system or electrons in a copper wire. When delivering hydrogen, whether by truck or pipeline, the energy costs are several times that for established energy carriers like natural gas or gasoline.

Even the most efficient fuel cells cannot recover these losses, Bossel found. For comparison, the "wind-to-wheel" efficiency is at least three times greater for electric cars than for hydrogen fuel cell vehicles.

Another headache is storage. When storing liquid hydrogen, some gas must be allowed to evaporate for safety reasons—meaning that after two weeks, a car would lose half of its fuel, even when not being driven. Also, Bossel found that the output-input efficiency cannot be much above 30%, while advanced batteries have a cycle efficiency of above 80%.

In every situation, Bossel found, the energy input outweighs the energy delivered by a factor of three to four.

“About four renewable power plants have to be erected to deliver the output of one plant to stationary or mobile consumers via hydrogen and fuel cells,” he writes. “Three of these plants generate energy to cover the parasitic losses of the hydrogen economy while only one of them is producing useful energy.”

This fact, he shows, cannot be changed with improvements in technology. Rather, the one-quarter efficiency is based on necessary processes of a hydrogen economy and the properties of hydrogen itself, e.g. its low density and extremely low boiling point, which increase the energy cost of compression or liquefaction and the investment costs of storage.

Gasoline and Battery Power Efficiency

T­he efficiency of a gasoline-powered car is surprisingly low. All of the heat that comes out as exhaust or goes into the radiator is wasted energy. The engine also uses a lot of energy turning the various pumps, fans and generators that keep it going.

So the overall efficiency of an automotive gas engine is about 20 percent. That is, only about 20 percent of the thermal-energy content of the gasoline is converted into mechanical work.

A battery-powered electric car has a fairly high efficiency. The battery is about 90-percent efficient (most batteries generate some heat, or require heating), and the electric motor/inverter is about 80-percent efficient. This gives an overall efficiency of about 72 percent.




But that is not the whole story. The electricity used to power the car had to be generated somewhere. If it was generated at a power plant that used a combustion process (rather than nuclear, hydroelectric, solar or wind), then only about 40 percent of the fuel required by the power plant was converted into electricity.

The process of charging the car requires the conversion of alternating current (AC) power to direct current (DC) power. This process has an efficiency of about 90 percent.

So, if we look at the whole cycle, the efficiency of an electric car is 72 percent for the car, 40 percent for the power plant and 90 percent for charging the car. That gives an overall efficiency of 26 percent.

OVER ALL EFFICIENCY

The overall efficiency varies considerably depending on what sort of power plant is used. If the electricity for the car is generated by a hydroelectric plant for instance, then it is basically free (we didn't burn any fuel to generate it), and the efficiency of the electric car is about 65 percent.

Scientists are researching and refining designs to continue to boost fuel cell efficiency. One approach is to combine fuel cell and battery-powered vehicles.

Ford Motors and Airstream are developing a concept vehicle powered by a hybrid fuel cell drivetrain named the HySeries Drive. Ford claims the vehicle has a fuel economy comparable to 41 miles per gallon. The vehicle uses a lithium battery to power the car, while the fuel cell recharges the battery.

Tesla is in the process of completing its full electric car into car market sooner than we expected.










ELECTRON +  (SOFC) FUEL CELL TECHNOLOGY:


Sustainable Future:  An electron economy



In an electron economy, most energy would be distributed with highest efficiency by electricity and the shortest route in an existing infrastructure could be taken. The efficiency of an electron economy is not affected by any wasteful conversions from physical to chemical and from chemical to physical energy. In contrast, a hydrogen economy is based on two such conversions (electrolysis and fuel cells or hydrogen engines).

The Swiss-based fuel-cell engineer and entrepreneur Ulf Bossel coined the term and concept “electron economy”

“An electron economy can offer the shortest, most efficient and most economical way of transporting the sustainable ‘green’ energy to the consumer,” Ulf says. “With the exception of biomass and some solar or geothermal heat, wind, water, solar, geothermal, heat from waste incineration, etc. become available as electricity.

Electricity could provide power for cars, comfortable temperature in buildings, heat, light, communication, etc.

“In a sustainable energy future, electricity will become the prime energy carrier. We now have to focus our research on electricity storage, electric cars and the modernization of the existing electricity infrastructure.”

Will we see a jumpstart in our economy?  Will there be a massive "Hoover like Project for Electrons" - a real transformation of our economy?  Will building a Renewable Electron jumpstart our weak global economy. US must have to lead if it has to see "global changes " ahead of us!

According to Ulf,  A number of factors are contributing to this emerging consensus that we build a Renewable Electron Economy:

• We need to rapidly reduce our net emissions of greenhouse gases to near zero.
• We are dangerously dependent on a depleting source of fossil energy, oil, for transportation and agriculture.  Oil deposits are also found in only a few places in the world, which creates trade and political imbalances, while renewable energy has a more balanced geographical distribution.
• Levels of local, visible and sensible (non-GHG) air pollution in rapidly industrializing nations (mostly China but also India) from fossil fuel use have been reaching levels that demand rapid action on the part of governments to maintain public health in the near future.
• Most of the world’s economies are in a “Great Recession” and, if one believes as did the economist John Maynard Keynes that government stimulus is key in shortening and ameliorating the effects of economic downturns;  the building of the public works and infrastructure required in the Renewable Electron Economy are productive uses of tax-payer money and government debt financing to spur demand and incentivize private investment.
• In addition to economic stimulative effects that would jumpstart our economies, the building of a Renewable Electron Economy would help create a focus and sense of overarching purpose or direction for economic activity (productive investment and work) where one now may be lacking.

 Additionally and importantly, clean, efficient methods of energy storage, like thermal storage, pumped storage, and various types of batteries are all key to creating a largely renewable energy system. 

 A Renewable Electron Economy can be brought closer to realization by the use of highly efficient electrical end-use devices as well as the harnessing  of natural energy flows directly (daylighting, natural and solar cooling and heating) where possible.

Renewable Electron Economy describes the transfer of most end-use of energy (transport, industrial processes, energy use in the home) to electricity and the generation of that electricity via renewable means.  Additionally and importantly, clean, efficient methods of energy storage, like thermal storage, pumped storage, and various types of batteries are all key to creating a largely renewable energy system.

 The substantial energy losses associated with the use of hydrogen as an energy storage medium (60-75% losses) are huge in comparison to the use of batteries or other electricity storage methods (10-25% losses) and would not improve much due to the energy required to isolate, compress, store, and then generate electricity in a fuel cell.

Dr. Bossel concluded, as have other analysts, that we would need to build a lot less clean electricity generation (50-70% less) if we were to run vehicles and other devices directly off electricity rather than using hydrogen as a form of battery.

Furthermore, and in this there is even more widespread agreement, biofuels have shown themselves to be a potential nightmare if they become a major source of fuel for transportation and mechanical devices. 

The production of biofuels from purpose-grown crops rather than wastes competes directly with food production and forest preservation for land, water and other resources; by comparison renewable electricity generation has a much smaller total ecological footprint.

We have already seen the near catastrophic effects of industrial biofuel production in Indonesia where higher-carbon forests are cut down to plant palm oil plantations.  The demand of the wealthier countries for mechanical energy competes directly with the needs of less developed countries for food energy.


Most vehicle internal combustion engines are somewhere in the area of 20-30% efficient; the most efficient internal combustion engines are the multi-story diesel engines in some large ships which convert at best 50% of the energy in diesel fuel to mechanical energy.

By contrast, mid-sized to large electric motors are around 90% efficient with some approaching 95% efficiency; taking into account mechanical losses and battery losses, an electric vehicle turns 65% of the energy input into it into locomotion while an internal combustion vehicle hovers around 20% efficiency or less.

 Biofuels also create local air pollution where they are burned which the consumption of renewably generated electricity does not.   While the carbon emissions of grid electricity in some areas can diminish some of the environmental advantages of electric vehicle use, the future belongs to electric drive, the expansion of which should function as a stimulus to clean up the grid more quickly.

The Electron Economy: Why is this concept useful?

The obvious may be happening in front of you but in the not so obvious future generations of railways and electric mobile personal cars (Have you seen the futuristic personal cars on the movie minority report?)  There are obvious infrastructures that need to be developed way ahead before we see gas stations with charging stations, sensor-linked highways, monitor your kids school via your Iphone; sensor-linked bus arrival, BART schedules and connect to your real time traffic. We need a reliable and smart "Electric Grid" infrastructure. Smart Railway infrastructures.

Look around us and you see transit bus,  Chevy Volt, Nissan Leaf roaming on your streets and not to mention solar panels on your neighbor's roof. It is true that we already partially live in an electron economy as much of the energy we use comes to us via electricity. The areas where electricity is not the primary energy carrier are transport and heating, so an advancement of the electron economy would mean advancing the use of electricity in these areas where feasible and desirable. 

The primary focus of the electron economy concept is largely the transport sector but could also have applications in heating applications as well.

 

The concept is useful because it highlights how theoretical and actual energy efficiencies will eventually favor electricity over its two competitors within the arena of clean energy solutions: biofuels and hydrogen fuel cells. Currently, in the marketplace of ideas in places such as 

Treehugger or in the mainstream media, it appears as though it is a horserace between these alternatives, that it is just a matter of taste or arcane insight into technology that favors the choice of one over the other.

And as indicated above, biofuels and even hydrogen may have a place in a sustainable energy future but they are not nearly as well developed nor as efficient as electricity and electric motors.

BUCKYPAPER from Carbon Nanotube MATERIAL

Even in the area of heating, where electricity has historically been more expensive and less efficient than the use of combustible fuels, the use of induction heating in cooking and ground-source heat pumps in space heating are two examples of how largely electric-powered solutions can either compete with or surpass heating from combustible fuels in the area of efficiency.

Key Technologies for More Energy Efficient, Carbon Neutral Living

Listed below are some of the key technologies that will help us achieve energy independence and carbon neutrality more quickly.

1) Heat pumps: ground source, air source, hybrid and with bore hole thermal energy storage

2) Super-glass (low emissivity, selectively coated, insulated) and super-windows

3) High-R Insulation and structural insulated panels

4) Efficient Fluorescent and Efficient LED Lighting

5) Fiber-optic solar lighting and advanced skylights for daylighting

6) Intelligent building, lighting, and appliance controls

7) Light-colored and “cool-colored” building and paving materials (that reduce the heat island effect of the built environment and building heat loads)

’8) Solar thermal water and space heating

9) Variable Frequency Drives (electronically adjusting pump and fan speeds to energy demand)

10) Weatherproofing and tighter building envelope standards (with testing)

11) Radiant heating (using water rather than air as the heat transfer medium in a building)

12) Induction cooktops, convection ovens and electric infrared grilling

• Passive House + Energy efficiency: 

Energy consumption is reduced by more innovative and intelligent products and by intelligent process integration.
In most cases this needs some additional investment, but these are cost-effective as a rule. The products needed can be produced near the customer. This gives rise to employment and innovation.
  
The Passive House concept is a comprehensive approach to cost-efficient, high quality, healthy and sustainable construction. The concept is easy to understand:

1. Contemporary construction is quite airtight, therefore the air replacement from infiltration is not sufficient. Ventilating by opening windows is not a convincing strategy either. Getting a sufficient volume of fresh air is not just a question of comfort, but a requirement for healthy living conditions. Therefore mechanical ventilation is the key technology for all new construction as well as refurbishment of existing buildings. Mechanical ventilation will work in all cold and all hot climates since in an airtight house, the heating and cooling energy required will be significantly less.
2. Even though mechanical ventilation systems raise initial investment costs, if designed efficiently they will reduce energy costs significantly, eventually paying off the initial cost. Ventilation units suitable for Passive Houses allow for an economic operation.
3. Now we explain the central "trick" of the Passive House concept: The fresh air needed is entering the room anyhow. If one could use this air to cover the heating load, without increasing the mass flow, without recirculated air, without noise and without drafts - then the ventilation will pay off a second time.
4. This concept of "fresh air heating" is only possible in a building with superior thermal insulation, just like a Passive House. For experts: This is the defining requirement; the maximum heat load should be lower than 10 W/m² , allowing the fresh air to carry the heat load.

Passive Houses require superior design and components with respect to:

• insulation
• design without thermal brigdes
• air tightness
• ventilation with heat recovery
• comfortwindows und
• innovative heating technology

The Passive House is a perfect example for what can be done with really energy efficient concepts: The energy consumption of Passive Houses is just some 10% compared to the average of the building stock, but the comfort in the buildings is even better. This has been proven by monitoring of Hundreds of built Passive Houses.




The continuing push towards deregulation, which still has ideological momentum despite bitter experiences in California at the beginning of the decade, does not promote the building of new infrastructure, let alone a new, replacement clean power infrastructure that would reliably produce power. 

And of course, generating electricity does not necessarily release greenhouse gases into the atmosphere..

Hydrogen SOFC Cells: UAV and future Unmanned submarines, Transport

There is an ever increasing need for  stealthy underwater platforms, unmanned underwater vehicles, ocean research vessels, and mobile counter measure devices.  Hence a need for much quieter and almost undetectable emissions of all types.  There's also a move for all-electric platform concepts for improved underwater fishing. Storing and underwater batteries both for life-saving mechanisms.

The fuel cell integrated into micro UAV designed by two US aerospace research laboratories and with NASA support (Dryden Flight Research Center, US Air Force Scientific Research, National Science Foundation set a new micro-UAV flight distance of 78 miles. 

The flight record was achieved using only 25% of the hydrogen tank capacity stored-on-board the UAV.  The ultra-compact fuel cell propulsion system creates high efficiencyy electrical power by reacting hydrogen and  oxygen from the air without combustion. The Fuel Cells enable longer flight times, quieter operation, less heat signature, and higher reliability than batteries other methods of propulsion for many UAV'

• A new process is being tested by chemical engineers of Purdue University to get high hydrogen production at fuel-cell temperature-level with no catalyst use. This is full of promise for vehicles powered by hydrogen and other portable electronic items like dig-cams, medical diagnostic devices, defibrillators, cell phones and notebook computers. The research funded by US Department of Energy is ushering in a new process.
  

• A team of researchers at the Harvard School of Engineering and Applied Sciences that is headed by Sriram Ramanathan is working on developing fuel cells. If Ramanathan is to be believed, the solid-oxide fuel cells the visionary and specialist in the field is making along with other scientists, will become a highly sought after technology in days to come. How will solid-oxide fuel cells be generated? The solid-oxide fuel cells that are capable of replacing fossil fuel with pollution less fuel are generated with the use of the plentiful fuel resources and low operating temperatures, along with some material that is of low cost, and some other small devices.

Hydrogen has great potential as a fuel of future because it is an environmentally clean energy fuel and save us from the undesirable side effects of greenhouse gases. Before becoming it a fuel of the masses we need necessary infrastructure to store it and move it. We will also need fuel cells on economical scale. To make hydrogen as a popular alternative fuel some engineers are working on storage factor of hydrogen fuel. They don’t want compressed hydrogen into a tank. They want to store hydrogen fuel into a large molecule. When we want hydrogen out of the molecule we will need a catalyst. Now, researchers have new details about one such catalyst.

New Low cost hydrogen fuel cell theory:

POWER SOURCES: UNDERWATER PLATFORMS
Source of power can be classed into either power generation or energy storage devices. Nuclear submarine (SSN) to cite an example has three power sources. Primary power source is from Nuclear steam raising plant (NSRP); auxiliary power source comes from Diesel generator; Emergency energy storage uses Lead acid battery.

 FUEL CELLS: TO SUPPLY SILENT POWER OPERATIONS IN LITTORAL WATERS:
Fuel cells convert a fuel and an oxidant directly into electricity by an electrochemical process, which in theory, up to 100% efficient. Practical limitations lower the fuel cells efficiency typically between 40% and 65%.  The basic fuel cell stack has no moving parts, can generate silently with least maintenance and a long life.

Solid oxide fuel cells operate at high temperatures (c-750-1000 degrees C) using ceramic materials as electrolyte and electrodes.  Utility power generators and naval applications,  uses hydrocarbon fuel directly by internal reformation to hydrogen and carbon dioxide and by direct oxidation. Alkaline fuel cells have been developed in space and automotive applications. Alkaline electrolyte has found uses on submarine in conjunction with direct liquid fuel.

PEMFC  PROTON EXCHANGE MEMBRANE FUEL CELL:  This technology has the greatest potential for submarine applications since it offers gravimetric and volumetric power density (better than 700W/kg and 1100 W/dm3) and operates at up to 80 degree C  with instant start up. The heart of the fuel stack is the membrane-electrode assembly.

METAL-OXIDANT SEMI FUEL CELLS:  Aluminum-oxygen systems are currently in use in the US UUV power.  Asystem has been developed by alupower which uses oxygen stored as a compressed gas and has energy density of 265 Wh/kg and per litre. The developers of the ARCS power source have a specific energy density of 400Wk/g for an aluminum-oxygen system using hydrogen peroxide as the oxidant. Magnesium-hydrogen peroxide system has specific target of 550 Wh/kg currently used by UUv's.

Of the newest AIP power generator, the proto exchange membrane fuel cell (PEMFC) is the most fuel efficient for all sizes of platform. The ideal fuel option would be hydrogen stored in a reversible metal hydride or in compressed form using advance high performing composite cylinder. Carbon nanofibre, aluminum, magnesium or lithium  could be explored and attractive than hydrogen.

Soon we would be using integrated, hybrid, air-independent propulsion system in a full electric architecture for littoral operations and submerged platforms. Its quiet and powerful.

Bloom Energy Fuel Cell: Powering your home and buildings soon!

 

What is a fuel cell? 

A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity, with water and heat as its by-product.  As long as fuel is supplied, the fuel cell will continue to generate power.  Since the conversion of thefuel to energy takes place via an electrochemical process, not combustion, the process is clean, quiet and highly efficient – two to three times more efficient than fuel burning.

No other energy generation technology offers thecombination of benefits that fuel cells do.  In addition to low or zero emissions, benefits include high efficiency and reliability, multi-fuel capability, siting flexibility, durability, scalability and ease of maintenance.  Fuel cells operate silently, so they reduce noise pollution as well as air pollution and the waste heat from a fuel cell can be used to provide hot water or space heating for a home or office. 

See all of the different applications fuel cells can be used for!

Why Use Fuel Cells?

 

 

 

Why is the U.S. government working with universities, public organizations and private companies to overcome all the challenges of making fuel cells a practical source for energy? More than a billion dollars has been spent on research and development on fuel cells. A hydrogen infrastructure will cost considerably more to construct and maintain (some estimates top 500 billion dollars).


Why does the president think fuel cells are worth the investment?

The main reasons have everything to do with oil. America must import 55 percent of its oil.


By 2025 this is expected to grow to 68 percent. Two thirds of the oil Americans use every day is for transportation. Even if every vehicle on the street were a hybrid car, by 2025 we would still need to use the same amount of oil then as we do right now [Source: Fuel Cells 2000]. In fact, America consumes one quarter of all the oil produced in the world, though only 4.6 percent of the world population lives here [Source: National Security Consequences of U.S.
Oil Dependency].

A Fuel Cell That Runs on Waste Environmental engineers at Pennsylvania State University developed a fuel cell that runs on wastewater. The cell uses microbes to break down organic matter. The matter in turn releases hydrogen and electrons. The fuel cell can break down approximately 80 percent of the organic matter in wastewater, and like PEMFCs the output is heat and pure water. The energy generated by the fuel cell could help power a water treatment plant pump system.

Experts expect oil prices to continue to rise over the next few decades as more low-cost sources are depleted. Oil companies will have to look in increasingly challenging environments for oil deposits, which will drive oil prices higher.


Concerns extend far beyond economic security. The Council on Foreign Relations released a report in 2006 titled "National Security Consequences of U.S. Oil Dependency." A task force detailed numerous concerns about how America's growing reliance on oil compromises the safety of the nation. Much of the report focused on the political relationships between nations that demand oil and the nations that supply it. Many of these oil rich nations are in areas filled with political instability or hostility. Other nations violate human rights or even support policies like genocide. It is in the best interests of the United States and the world to look into alternatives to oil in order to avoid funding such policies.
Using oil and other fossil fuels for energy produces pollution. Pollution issues have been in the news a lot recently -- from the film "An Inconvenient Truth" to the announcement that climate change and global warming would factor into future adjustments of the Doomsday Clock. It is in the best interest for everyone find an alternative to burning fossil fuels for energy.

Fuel cell technologies are an attractive alternative to oil dependency. Fuel cells give off no pollution, and in fact produce pure water as a byproduct. Though engineers are concentrating on producing hydrogen from sources such as natural gas for the short-term, the Hydrogen Initiative has plans to look into renewable, environmentally-friendly ways of producing hydrogen in the future. Because you can produce hydrogen from water, the United States could increasingly rely on domestic sources for energy production.
Other countries are also exploring fuel-cell applications. Oil dependency and global warming are international problems. Several countries are partnering to advance research and development efforts in fuel cell technologies. One partnership is The International Partnership for the Hydrogen Economy.

International Partnership for the Hydrogen Economy
Australia	India
Brazil	Italy
Canada	Japan
China	New Zealand
European Commission	Norway
France	Korea
Germany	Russian Federation
Iceland	United Kingdom
	United States

Clearly scientists and manufacturers have a lot of work to do before fuel cells become a practical alternative to current energy production methods. Still, with worldwide support and cooperation, the goal to have a viable fuel cell-based energy system may be a reality in a couple of decades.

 

Fuel Cell Efficiency

Hydrogen Hydrogen is the most common element in the universe. However, hydrogen does not naturally exist on Earth in its elemental form. Engineers and scientists must produce pure hydrogen from hydrogen compounds, including fossil fuels or water. In order to extract hydrogen from these compounds, you have to exert energy. The required energy may come in the form of heat, electricity or even light.

P­ollution reduction is one of the primary goals of the fuel cell. By comparing a fuel-cell-powered car to a gasoline-engine-powered car and a battery-powered car, you can see how fuel cells might improve the efficiency of cars today.
Since all three types of cars have many of the same components (tires, transmissions, et cetera), we'll ignore that part of the car and compare efficiencies up to the point where mechanical power is generated. Let's start with the fuel-cell car. (All of these efficiencies are approximations, but they should be close enough to make a rough comparison.)

Photo copyright 2007, courtesy AutoMotoPortal.com

Honda's FCX Concept Vehicle

• If the fuel cell is powered with pure hydrogen, it has the potential to be up to 80-percent efficient. That is, it converts 80 percent of the energy content of the hydrogen into electrical energy. However, we still need to convert the electrical energy into mechanical work. This is accomplished by the electric motor and inverter. A reasonable number for the efficiency of the motor/inverter is about 80 percent. So we have 80-percent efficiency in generating electricity, and 80-percent efficiency converting it to mechanical power. That gives an overall efficiency of about 64 percent. Honda's FCX concept vehicle reportedly has 60-percent energy efficiency.

• If the fuel source isn't pure hydrogen, then the vehicle will also need a reformer. A reformer turns hydrocarbon or alcohol fuels into hydrogen. They generate heat and produce other gases besides hydrogen. They use various devices to try to clean up the hydrogen, but even so, the hydrogen that comes out of them is not pure, and this lowers the efficiency of the fuel cell. Because reformers impact fuel cell efficiency, DOE researches have decided to concentrate on pure hydrogen fuel-cell vehicles, despite challenges associated with hydrogen production and storage. 

Gasoline and Battery Power Efficiency

T­he efficiency of a gasoline-powered car is surprisingly low. All of the heat that comes out as exhaust or goes into the radiator is wasted energy. The engine also uses a lot of energy turning the various pumps, fans and generators that keep it going. So the overall efficiency of an automotive gas engine is about 20 percent. That is, only about 20 percent of the thermal-energy content of the gasoline is converted into mechanical work.

A battery-powered electric car has a fairly high efficiency. The battery is about 90-percent efficient (most batteries generate some heat, or require heating), and the electric motor/inverter is about 80-percent efficient. This gives an overall efficiency of about 72 percent.
But that is not the whole story. The electricity used to power the car had to be generated somewhere. If it was generated at a power plant that used a combustion process (rather than nuclear, hydroelectric, solar or wind), then only about 40 percent of the fuel required by the power plant was converted into electricity. The process of charging the car requires the conversion of alternating current (AC) power to direct current (DC) power. This process has an efficiency of about 90 percent.

So, if we look at the whole cycle, the efficiency of an electric car is 72 percent for the car, 40 percent for the power plant and 90 percent for charging the car. That gives an overall efficiency of 26 percent. The overall efficiency varies considerably depending on what sort of power plant is used. If the electricity for the car is generated by a hydroelectric plant for instance, then it is basically free (we didn't burn any fuel to generate it), and the efficiency of the electric car is about 65 percent.

Scientists are researching and refining designs to continue to boost fuel cell efficiency. One approach is to combine fuel cell and battery-powered vehicles. Ford Motors and Airstream are developing a concept vehicle powered by a hybrid fuel cell drivetrain named the HySeries Drive. Ford claims the vehicle has a fuel economy comparable to 41 miles per gallon. The vehicle uses a lithium battery to power the car, while the fuel cell recharges the battery.

Types of Fuel Cells

The Invention of the Fuel Cell Sir William Grove invented the first fuel cell in 1839. Grove knew that water could be split into hydrogen and oxygen by sending an electric current through it (a process called electrolysis). He hypothesized that by reversing the procedure you could produce electricity and water. He created a primitive fuel cell and called it a gas voltaic battery. After experimenting with his new invention, Grove proved his hypothesis. Fifty years later, scientists Ludwig Mond and Charles Langer coined the term fuel cell while attempting to build a practical model to produce electricity.

The fuel cell will compete with many other energy­ conversion devices, including the gas turbine in your city's power plant, the gasoline engine in your car and the battery in your laptop. Combustion engines like the turbine and the gasoline engine burn fuels and use the pressure created by the expansion of the gases to do mechanical work. Batteries convert chemical energy back into electrical energy when needed. Fuel cells should do both tasks more efficiently.

A fuel cell provides a DC (direct current) voltage that can be used to power motors, lights or any number of electrical appliances.

There are several different types of fuel cells, each using a different chemistry. Fuel cells are usually classified by their operating temperature and the type of electrolyte they use. Some types of fuel cells work well for use in stationary power generation plants. Others may be useful for small portable applications or for powering cars. The main types of fuel cells include:

Polymer exchange membrane fuel cell (PEMFC)
The Department of Energy (DOE) is focusing on the PEMFC as the most likely candidate for transportation applications. The PEMFC has a high power density and a relatively low operating temperature (ranging from 60 to 80 degrees Celsius, or 140 to 176 degrees Fahrenheit). The low operating temperature means that it doesn't take very long for the fuel cell to warm up and begin generating electricity. We?ll take a closer look at the PEMFC in the next section.

Solid oxide fuel cell (SOFC)

These fuel cells are best suited for large-scale stationary power generators that could provide electricity for factories or towns. This type of fuel cell operates at very high temperatures (between 700 and 1,000 degrees Celsius). This high temperature makes reliability a problem, because parts of the fuel cell can break down after cycling on and off repeatedly. However, solid oxide fuel cells are very stable when in continuous use. In fact, the SOFC has demonstrated the longest operating life of any fuel cell under certain operating conditions. The high temperature also has an advantage: the steam produced by the fuel cell can be channeled into turbines to generate more electricity. This process is called co-generation of heat and power (CHP) and it improves the overall efficiency of the system.

Alkaline fuel cell (AFC)
This is one of the oldest designs for fuel cells; the United States space program has used them since the 1960s. The AFC is very susceptible to contamination, so it requires pure hydrogen and oxygen. It is also very expensive, so this type of fuel cell is unlikely to be commercialized.

Molten-carbonate fuel cell (MCFC)
Like the SOFC, these fuel cells are also best suited for large stationary power generators. They operate at 600 degrees Celsius, so they can generate steam that can be used to generate more power. They have a lower operating temperature than solid oxide fuel cells, which means they don't need such exotic materials. This makes the design a little less expensive.

Phosphoric-acid fuel cell (PAFC)
The phosphoric-acid fuel cell has potential for use in small stationary power-generation systems. It operates at a higher temperature than polymer exchange membrane fuel cells, so it has a longer warm-up time. This makes it unsuitable for use in cars.

Direct-methanol fuel cell (DMFC)
Methanol fuel cells are comparable to a PEMFC in regards to operating temperature, but are not as efficient. Also, the DMFC requires a relatively large amount of platinum to act as a catalyst, which makes these fuel cells expensive.
In the following section, we will take a closer look at the kind of fuel cell the DOE plans to use to power future vehicles -- the PEMFC.

BACTERIA : MICROBIAL FUEL CELL

Click on video stream  website below to show how bacteria are producing energies of the future!




http://nsfgov.http.internapcdn.net/nsfgov_vitalstream_com/science_nation/SN099wastetoenergy_long.mov