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Solar Tree Bears Fruit
Hugh Pickens writes "A prototype solar tree that recently went on display on a busy street in Vienna, Austria has passed a key test by providing light during the night-time even when the sun had been blocked by clouds for four days in a row. The branches of the solar tree were decorated with 10 solar lamps, each one powered by 36 solar cells. The tree included rechargeable batteries and electronic systems to measure the amount of light in the atmosphere and trigger the solar lamps to go on. 'Not just trees but other objects could be decorated with solar cells and so keep streets well lit at night time,' said Christina Werner from Cultural Project Management. Google uses a similar concept to light their parking lots with 3,000 solar panels that provide up to 10 percent of the Googleplex's power demand. We discussed Google's solar initiative last year."
How much non-renewable energy does it take to produce each solar tree?
With a few minor changes, this "tree" could collect the rain water that runs off the solar panel and store it in its "trunk." Then, it would slowly release the water during the night to water the plants around the base of the tree. The result would save water and create a literally greener environment.
Two wrongs don't make a right, but three lefts do.
I believe Vienna is in AUSTRIA.
I want to delete my account but Slashdot doesn't allow it.
As a citizen of Austria, I find it quite astonishing that this thing was able to provide light for a couple of days, although I have to admit that compared to now October still had plenty of daylight. I don't know whether or not they have been removed from the streets, but it would be pretty interesting to see for how long they can go in December/January, when it's quite dark throughout the entire month.
Apart from the energy savings, though, I wouldn't necessarily want to see them implemented throughout the city. Most of the 1st district's lighting is quite dim, giving the whole city with its many historic buildings a bit of a romantic flair, which - in my opinion - would be lost with all those bright lights everywhere.
:/- spoon(_).
So long as fossil fuels are being burned to make power during the day, it is far more efficient to take the daytime output of the most cost-effective possible panels (usually nice unimaginative rectangular ones that mount on existing roofs or new carport structures) and feed it directly to the grid to reduce the load on the inefficient plants that peak during the daytime. There is no reason to lose a major chunk of the power charging batteries, to build expensive battery arrays or to build bizarre structures to support the cells.
At night, the worst power plants are throttled back or shut down and the most efficient plants are handling the load.
When no further fossil fuels are used to make daytime power, then storing electricity from daylight becomes interesting and, even then, batteries are a loser.
Its not too bad not suitable for every street admittedly.
its look is like an anemone quite alien an almost Martian chronicles feel to it. googles bus shelter designs are not as interesting to look at.
cost to make them may be quite high, however with 10% of European electricity production going into street lighting in europe the potential reduction in carbon emissions is significant.
Retro fitting just the LED lamps to existing street lighting could be power saving in itself. The solar panels wouldn't need to provide power year round since existing lamps have a power supply they could switch too.
I'm sure more sympathetic designs could be made, its the potential of this project which makes it interesting.
The real questions are how much power is required and how much light do these tree's produce.
Blarney Quality Restaurant, Plants
Why bother going to the trouble of milking high quality renewable energy from the environment if you're just going to waste it on something frivolous like keeping an empty expanse of pavement lit up for eight hours a day!? If we stopped frittering away energy on pointless things like lighting empty parking lots, we'd have a lot less to worry about in terms of energy security. Even the big G doesn't get it.