Hybrid Energy Harvesting Tool Uses Light/Heat to Produce Electricity
December 9, 2010 1:30 PM
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Prototype of the hybrid generating device
(Source: Fujitsu Laboratories )
Novel concept combines two devices into one for inexpensive, easy and guaranteed energy harvesting
Fujitsu Laboratories Ltd.
has created a hybrid energy harvesting tool that is capable of drawing heat or light to generate electricity.
This new device is a
because it combines two methods of creating electricity that, up until this point, could only work independently. Photovoltaic cells generate electricity from light and thermoelectric devices generate electricity from temperature differentials. Now, instead of having both as separate tools, they've been combined as one.
Energy harvesting has become a popular idea for generating electricity without the use of batteries or power cords. The process draws energy from surrounding light, heat, radio waves, vibration, etc.
Up until now, the problem with
devices was that they couldn't draw enough energy from surrounding elements to power larger equipment, such as ICT equipment. Power plants and batteries provide much more power capable of running such equipment. Another problem is that the sun doesn't always shine, the wind doesn't always blow, etc. So having a device that relies on only one surrounding element can be a problem if that particular element is unavailable for an extended period of time.
But now, Fujitsu Laboratories has merged two devices into one, creating a tool that can use light or heat to create electricity. Light and heat were chosen because they are the most common types of ambient energy available, and can be manufactured from
that are inexpensive.
To make this device, Fujitsu Laboratories changed the circuits that connect the two types of
, which are the P-type and N-type semiconductors. By doing this, the photovoltaic cell and thermoelectric generator can function.
The device is made from organic material that has a high generating efficiency. It is able to produce power from heat in thermoelectric mode as well as generate power from indoor and outdoor lighting in photovoltaic mode.
With the device being small and mobile, it is easy for every day use. The organic material also makes the device inexpensive, which means it has potential for widespread use. Fujitsu Laboratories also notes that this technology "can also be used for environmental sensing in remote areas for
," since replacing batteries would be difficult in these specific places.
Fujitsu Laboratories plan to commercialize this type of technology by approximately 2015.
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RE: Wow that's cool...
12/11/2010 6:29:21 PM
It cannot be concluded that putting the alternator at higher load, to charge a battery (not 100% efficient), then power an electric motor from it for the compressor, is inherently more efficient than simply direct driving (via belt) the compressor from the engine.
Plus, it's more expensive to put a motor in the compressor than a few inches longer belt, and heavier.
Add that weight, weight of a larger battery, power management computer, and whatever else you'd like to conceive and you have no assurance it is higher efficiency (decoupling clutch for an alternator needs no computer it could be a simple voltage sense circuit same as used to determine alternator loading) but it will certainly be heavier and more expensive.
That's not progress. The most effective use of electric motors will be for things that aren't constant duty like steering while an alternator can be sized and cycled at low duty to keep battery at the required voltage level. Cycling it on and off with decoupling would only be needed if it is oversized (weight and expense again) for the job.
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