Wednesday, March 26, 2008

Fuel cell applications

There are many uses for fuel cells — right now, all of the major automakers are working to commercialize a fuel cell car. Fuel cells are powering buses, boats, trains, planes, scooters, forklifts, even bicycles. There are fuel cell-powered vending machines, vacuum cleaners and highway road signs. Miniature fuel cells for cellular phones, laptop computers and portable electronics are on their way to market. Hospitals, credit card centers, police stations, and banks are all using fuel cells to provide power to their facilities. Wastewater treatment plants and landfills are using fuel cells to convert the methane gas they produce into electricity. Telecommunications companies are installing fuel cells at cell phone, radio and 911 towers. The possibilities are endless.

Stationary

More than 2500 fuel cell systems have been installed all over the world — in hospitals, nursing homes, hotels, office buildings, schools, utility power plants - either connected to the electric grid to provide supplemental power and backup assurance for critical areas, or installed as a grid-independent generator for on-site service in areas that are inaccessible by power lines.

Fuel cell power generation systems in operation today achieve 40 percent fuel-to-electricity efficiency utilizing hydrocarbon fuels. Since fuel cells operate silently, they reduce noise pollution as well as air pollution and when the fuel cell is sited near the point of use, its waste heat can be captured for beneficial purposes (cogeneration). In large-scale building systems, these fuel cell cogeneration systems can reduce facility energy service costs by 20% to 40% over conventional energy service and increase efficiency to 85 percent. Check out our database of worldwide stationary fuel cell installations.


Telecommunications - With the use of computers, the Internet, and communication networks steadily increasing, there comes a need for more reliable power than is available on the current electrical grid, and fuel cells have proven to be up to 99.999% (five nines) reliable. Fuel cells can replace batteries to provide power for 1kW to 5kW telecom sites without noise or emissions, and are durable, providing power in sites that are either hard to access or are subject to inclement weather. Such systems would be used to provide primary or backup power for telecom switch nodes, cell towers, and other electronic systems that would benefit from on-site, direct DC power supply.

Landfills/Wastewater Treatment Plants/Breweries - Fuel cells currently operate at landfills and wastewater treatment plants across the country, proving themselves as a valid technology for reducing emissions and generating power from the methane gas they produce. They are also installed at several breweries - Sierra Nevada, Kirin, Asahi and Sapporo. Untreated brewery effluent can undergo anaerobic digestion, which breaks down organic compounds to generate methane, a hydrogen rich fuel.


Transportation

Cars - All the major automotive manufacturers have a fuel cell vehicle either in development or in testing right now, and several have begun leasing and testing in larger quantities. Commercialization is a little further down the line (some automakers say 2012, others later), but every demonstration helps bring that date closer. Check out our page on Benefits for Transportation and for a comprehensive chart showcasing all the fuel cell vehicles ever demonstrated, visit our Charts page.

Buses - Over the last four years, more than 50 fuel cell buses have been demonstrated in North and South America, Europe, Asia and Australia. Fuel cells are highly efficient, so even if the hydrogen is produced from fossil fuels, fuel cell buses can reduce transit agencies’ CO2 emissions. And emissions are truly zero if the hydrogen is produced from renewable electricity, which greatly improves local air quality. Because the fuel cell system is so much quieter than a diesel engine, fuel cell buses significantly reduce noise pollution as well. For a comprehensive chart on fuel cell buses, click here.

Scooters - In spite of their small size, many scooters are pollution powerhouses. Gas-powered scooters, especially those with two-stroke engines, produce tailpipe emissions at a rate disproportionate to their small size. These two-stroke scooters produce almost as much particulate matter and significantly more hydrocarbons and carbon monoxide as a heavy diesel truck. Fuel cell scooters running on hydrogen will eliminate emissions - in India and Asia where many of the population use them - this is a great application for fuel cells.


Forklifts/Materials Handling - Besides reducing emissions, fuel cell forklifts have potential to effectively lower total logistics cost since they require minimal refilling and significantly less maintenance than electric forklifts, whose batteries must be periodically charged, refilled with water, and replaced. Due to the frequent starting and stopping during use, electric forklifts also experience numerous interruptions in current input and output - fuel cells ensure constant power delivery and performance, eliminating the reduction in voltage output that occurs as batteries discharge.

Auxiliary Power Units (APUs) - Today’s heavy-duty trucks are equipped with a large number of electrical appliances–from heaters and air conditioners to computers, televisions, stereos, even refrigerators and microwaves. To power these devices while the truck is parked, drivers often must idle the engine. The Department of Energy (DOE) has estimated the annual fuel and maintenance costs of idling a heavy-duty truck at over $1,800 and that using fuel cell APUs in Class 8 trucks would save 670 million gallons of diesel fuel per year and 4.64 million tons of CO2 per year.

Trains - Fuel cells are being developed for mining locomotives since they produce no emissions. An international consortium is developing the world’s largest fuel cell vehicle, a 109 metric-ton, 1 MW locomotive for military and commercial railway applications.

Planes - Fuel cells are an attractive option for aviation since they produce zero or low emissions and make barely any noise. The military is especially interested in this application because of the low noise, low thermal signature and ability to attain high altitude. Companies like Boeing are heavily involved in developing a fuel cell plane.

Boats - For each liter of fuel consumed, the average outboard motor produces 140 times the hydrocarbonss produced by the average modern car. Fuel cell engines have higher energy efficiencies than combustion engines, and therefore offer better range and significantly reduced emissions. Iceland has committed to converting its vast fishing fleet to use fuel cells to provide auxiliary power by 2015 and, eventually, to provide primary power in its boats.


Portable Power

Fuel cells can provide power where no electric grid is available, plus they are quiet, so using one instead of a loud, polluting generator at a campsite would not only save emissions, but it won't disturb nature, or your camping neighbors. Portable fuel cells are also being used in emergency backup power situations and military applications. They are much lighter than batteries and last a lot longer, especially imporant to soldiers carrying heavy equipment in the field.

Micro Power

Consumer Electronics- Fuel cells will change the telecommuting world, powering cellular phones, laptops and palm pilots hours longer than batteries. Companies have already demonstrated fuel cells that can power cell phones for 30 days with out recharging and laptops for 20 hours. Other applications for micro fuel cells include pagers, video recorders, portable power tools, and low power remote devices such as hearing aids, smoke detectors, burglar alarms, hotel locks and meter readers. These miniature fuel cells generally run on methanol, an inexpensive wood alcohol also used in windshield wiper fluid.

http://www.fuelcells.org/basics/apps.html

Fuel cell FAQ

When was the fuel cell invented?

Fuel cells were initially demonstrated in 1839, by Sir William Grove. However, a truly workable fuel cell was not demonstrated until 1959. After use in NASA's space programme, interest in fuel cells died down somewhat until the 1990s when research and development started to lead towards greater prospects of commercialisation.

Which fuels can be used in a fuel cell?

Most fuel cells use hydrogen at the point where the electrochemical reaction takes place. This hydrogen can be chemically generated or reformed from a variety of normal fuels, including gasoline, natural gas or methanol. There is no consensus as to the single best fuel.

What types of fuel cells are there?

There are a number of types of fuel cell which are normally distinguished by the electrolyte they contain. The best-known types are alkaline, molten carbonate, phosphoric acid, proton exchange membrane and solid oxide. Direct methanol and regenerative fuel cells are also being extensively researched.

What is a fuel cell?

A fuel cell is an electrochemical device that produces electricity and heat from a fuel (often hydrogen) and oxygen. Unlike a conventional engine, it does this without burning the fuel and can therefore be more efficient and cleaner.

Can I buy a fuel cell?

In general, fuel cells are in the development phase and are not yet commercially available. Many companies are currently running field trials of alpha and beta development units and hope to be commercialising this technology from as early as this year in some cases. However, some products, such as educational fuel cells, are commercially available now, as listed in our

Why use a fuel cell?

Fuel cells have a number of advantages over other technologies for power generation. They have the potential to use less fuel than competing technologies and to emit no pollution when used. There are also many reasons why a fuel cell might be useful in specific environments, such as the high quality of electricity generated or their quiet operation.

What devices could a fuel cell power?

In principle, a fuel cell could power any device that requires electrical energy to function. This could range from a mobile phone up to a factory. Presently, the majority of attention is focussed on powering automobiles, houses and medium-sized portable electrical equipment. However, announcements have suggested that portable computers may be an early application.

How much does a fuel cell cost?

Since fuel cells are not yet fully commercialised, they are produced in small numbers. Consequently, they tend to be more expensive than they will be when selling in significant quantities. However, as technology improves, cost reduction is proceeding towards meeting challenging cost targets set by the automotive industry. People involved in the industry generally believe that this can be accomplished and that in any case, costs will continue to decrease and will be significantly lower by the end of this decade than they are now.

What is the difference between a fuel cell and a battery?

Whilst a battery chemically stores and releases electricity, a fuel cell produces energy by reacting a fuel with air. A battery will therefore run out of power and have to be recharged or disposed of. A fuel cell, however, will continue to function and produce power as long as the fuel and oxygen are supplied to it.

Is hydrogen safe?

Like any other fuel, hydrogen is potentially dangerous and is flammable. However, so are gasoline, diesel and natural gas and this has not prevented their use to power cars, alongside the correct safety features. Hydrogen even has some advantages as it is non-toxic, a definite benefit over most fuels. Use of hydrogen would therefore present new but not insurmountable safety challenges.

Why not burn hydrogen instead of using it in a fuel cell?

Hydrogen is an extremely clean-burning fuel. However, any combustion process will produce small amounts of pollutants whereas a fuel cell has the potential to emit none. In addition to this, a fuel cell can inherently be more fuel-efficient than an internal combustion engine. However, there may be applications where burning hydrogen makes sense and it is possible to imagine that hydrogen fuel cell powered cars and hydrogen internal combustion engine powered cars could run side-by-side on the roads.

Are fuel cells a renewable energy source?

Fuel cells themselves are not a power source: rather they use a fuel to produce power. If this fuel is obtained from renewable sources, then fuel cells can be an important part of the energy chain, perhaps with hydrogen being used to store intermittent energy and fuel cells converting this hydrogen back to power when required.
http://www.fuelcelltoday.com/reference/faq

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 the fuel 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 the combination 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.

http://www.fuelcells.org/

Sony Bravia KDL-40D3500

What’s inside your BRAVIA TV?

Technologies that make a difference

Selected BRAVIA TV models offer important benefits.

Motionflow +100Hz

Motionflow doubles the frame rate by creating brand new pictures

Go with the flow

Standard on BRAVIA X series models and the BRAVIA D3000 model, Motionflow +100Hz technology has a really important job. It captures all the detail and drama of fast-moving action scenes, such as sports, and makes them ultra smooth.

Motionflow works by doubling up the number of frames you see on screen. New ones are inserted into fast-moving sequences, like the flight of a ball for instance, to smooth out the motion.

Based on information it gets from the before and after frames in every sequence, Motionflow cleverly creates brand new pictures to do this. So existing frames aren’t just copied and doubled up.

24p True Cinema

The reel thing

Thanks to 24p True Cinema technology, our BRAVIA X, W, V and D series models take feature film quality to a new level as well.

Modern film-makers shoot their films using 24 frames per second (24Hz, or 24p) and record them onto High Definition Blu-ray Disc™ using this format.

But conventional televisions and projectors (and most DVDs) operate at 50Hz.

To display the film, they have to double the original number of frames by duplicating existing ones and speeding the film up, which noticeably distorts synchronisation. They even raise the pitch of the actors’ voices.

24p True Cinema matches the original speed to capture the power and quality of the studio recording.

The 24p format is detected by your Blu-ray Disc player or PLAYSTATION®3 and outputted directly to the TV in 24 frames per second. What you see is exactly how it was originally recorded.

Cinema Mode and Theatre Mode

Cinema Mode preserves the mood and dramatic effects of movie content

Studio-standard films

Cinema Mode has been developed in collaboration with Sony Pictures Entertainment as an optimal picture setting for movie content.

Cinema mode is found on BRAVIA X, W, V, D, P and U series models plus the T3000 model and S3000 model.

When you select Cinema Mode with your remote it automatically adjusts your BRAVIA TV to better preserve the mood and detail intended by the filmmaker.

Picture quality is more natural and colour reproduction is more accurate, as if you were seeing it through the director’s camera.

But don’t be fooled, Cinema Mode is not designed to over-enhance colour and contrast or give it a super slick overlay. Far from it.

Instead, it brings you closer to the film experience just as it was meant to be enjoyed in the cinema.

Your BRAVIA will prevent dark scenes from becoming too bright, and it will maintain the appearance of film grain where the filmmakers intended.

An authentic home cinema experience at the touch of a button

Authentic film-quality

Theatre Mode goes one step further to give you authentic film-quality.

Theatre mode is also found on BRAVIA X, W, V, D, P and U series models plus the T3000 model and S3000 model.

Thanks to a combination of the Cinema Mode picture setting and several other unique Sony technologies, movies played back at home take on all the authenticity of the big screen.

One press of the Theatre button on the remote automatically turns on both Cinema Mode and 24p True Cinema. Motionflow +100Hz is switched off to preserve the original cinema experience.

But most important is BRAVIA Theatre Sync; a link up tool between all your home cinema components via HDMI with CEC.

By pressing the Theatre button on the remote commander, it turns the sound off on the TV and connects with any external sound component through HDMI.

You can control your entire cinema system with only one remote commander.

So there you have it. Three ultra powerful technologies doing amazing things behind the scenes in your BRAVIA TV without giving you a single clue that they’re there. We wouldn’t have it any other way.

http://www.sony.co.uk/view/ShowArticle.action?section=ODW+SS+en_GB+Products&articlesection=1&article=1198162903701&productcategory=TVP+32-40+Sony+BRAVIA+TV&productmodel=KDL-40D3500&productsku=KDL40D3500U&site=odw_en_GB

Sony KDL-40D3500 Review

Design

The KDL-40D3500 is the embodiment of Sony's design philosophy with a chic matte black understated presence that simply oozes class. Build quality is back to its very best with the Sony looking like it could have been sculpted from a solid block of metal.

Features

A change in model number from 3000 to 3500 would suggest that the KDL-40D3500 represented a relatively minor upgrade from its predecessor the KDL-40D3000. However, the changes in specification are more wide ranging than you would imagine.

Screen: 40in 16:9
Tuner:Digital
Sound System: Nicam
Resolution: 1920 x 1080
Contrast Ratio: 1800:1 (16,000 dynamic)
Brightness: 450cd/m2
Other Features: Bravia Picture Processing Engine, Live Colour Creation, 24p True Cinema.
Sockets: 2 HDMI, 2 SCART, Component Video, Composite Video, PC input.




To begin with, the 40D3500 gains a Full HD (1920 x 1080) resolution which can potentially give a marked improvement in the display of sources such as Sky Tv (1080i). The 1080 lines of resolution match the resolution of the screen negating the need for any picture scaling to fit. If you have a device which outputs pictures in the superior 1080p (e.g. Sony's PlayStation 3) the 3500 can accept those pictures in their full glory.

'Motionflow +100Hz' technology (featured on the 40D3000) which doubles the number of frames shown from 50 to 100 by interpolating an extra frame in between each source frame does not feature on the 40D3500.

With 2 HDMI inputs, the 3500 has one less than the 3000 model. Otherwise, the specification of both screens are largely similar.

The Sony 40D3500 is equipped with '24p True Cinema' which enables the panel to display films at their intended 24fps (frames per second).

Alongside 24p True Cinema is Sony's 'Theatre Mode' technology which adjusts colour, contrast and brightness settings to makes movies look as authentic as the original.

It is worth mentioning that the 24p mode comes into its own with High Definition (Blu-ray or HD DVD) players which allow you to play movies at their original speed. The original 'cine' film is generally recorded at 24 frames per second, which in the absence of '24p True Cinema' is speeded up to 25 (standard for most TV's) frames per second with an accompanying increase in audio pitch.

Colour reproduction on the KDL40D3500 should offer smoother transitions than previous Sony LCD's with a new 10-bit panel offering 1024 shades of gradation.

Theatre Sync, which is Sony's name for CEC (Consumer Electronic Control), is a control standard that functions over HDMI 1.3. The technology facilitates one-touch control over compatible devices and in practice means that if you fire up your compatible DVD player, the all connected devices such as your LCD TV will also spring into life.

Sonically, the KDL-40D3500 comes equipped with Sony's S-Force Front Surround which is their latest virtual surround sound technology.

Performance

Although specification has changed considerably between the 3500 and 3000 models, performance comparisons reveal a not so dramatically differing performance.

As with the previous model, High Definition (HD) is where the Sony KDL-40D3500 excels. Hook up a 1080p capable source however, and you have even more pristine pictures. The KDL-40D3500 displays a clarity and sharpness that make you want to reach out and touch objects or people as they glide across the screen. Colours are wonderfully vibrant and reach a level of authentic realism to match any LCD.

Although black levels are still behind the best that plasma can offer, the KDL-40D3500 has made great strides in this area from previous Sony's. Shadow detailing now takes on a subtlety which is a match for any 40in LCD currently out there.

Again, Standard Definition (SD) performance suffers to a degree from some of the inconsistencies that creep into a picture as a result of the conversion of a 576p source to an HD ready screen configuration.

The effectiveness of Sony's Motionflow +100Hz has always been open to question, and the fact that the 40D3500 does not seem to suffer too much from its departure suggests that this technology is not quite the complete article as yet. There was some evidence of a little more motion blur and shimmering than on the 3000, and the picture did appear to be very slightly 'grainy', but not to any great degree. The picture quality is still pretty good, but you'll have a hard time shifting down from HD because the picture is so outstanding in this respect.

Finally, if there is a 40in LCD TV out there with a richer or more precise colour palette, we have yet to see it. The range, depth and subtlety in this respect is simply outstanding. The most intricate of detailing such as skin tone is realised with class leading performance.

Conclusion

The Sony KDL-40D3500 is a highly accomplished performer when it comes to High Definition material. However, if SD viewing is just as important there are better performers out there.

40in LCD
Picture
Sound
Features
Usability
Value
Peerless HD performance tempered by slightly disappointing SD pictures.
HD Ready: yes
Resolution: 1920 x 1080
Rating: 89%

http://www.hdtvorg.co.uk/reviews/lcd/sony_kdl-40d3500.htm