Ηλιακή Ενέργεια

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Almost Everyone Is Angling Solar Panels the Wrong Way

 

 

 

Conventional wisdom in the northern hemisphere is to face solar panels south so they get the most light all day. Architects and panel installers implement this approach all the time, especially on homes. But a new study indicates that panels facing west may actually get more juice from the sun, and at more convenient times.

 

Researchers at the Pecan Street Research Institute did a study of homes with solar panels in Austin, Texas and found that when homeowners faced solar panels west they were able to generate 2% more electricity in a day. And they also generated more electricity in the afternoon, when power grids experience peak demand.

 

Though a 2% increase in electricity generation isn't enormous, it would certainly add up over the life of solar panels. And the rise in afternoon performance, reducing grid dependance during peak hours by 65% as opposed to 54% for south-facing panels, could have widespread efficiency implications beyond single homes.

 

It's only one study so nothing is definitive yet, but if nothing else the research raises a good point about testing solar panel performance in practice instead of just assuming that angling south is always the way to go. [Quartz via Digg]

 

Αναδημοσιευμένο από εδώ: http://gizmodo.com/a...-way-1466183416

[Χρήστος Λάππας 25,411]

Δωρεάν φως με πλαστικό μπουκάλι και νερό!

 

 

Δημοσιεύτηκε στις Κυριακή, 15 Σεπτεμβρίου 2013 01:42 Γράφτηκε από τον/την Christoforos Hionidis

 

 

Μία από τις καλύτερες πράσινες εφευρέσεις των τελευταίων ετών είναι αναμφισβήτητα η ιδέα της χρησιμοποίησης διάφανων πλαστικών μπουκαλιών με νερό, η οποία έγινε πράξη από τον Βραζιλιάνο Alfredo Mose το 2002 ο οποίος έψαχνε εκείνη τη περίοδο τρόπους να φωτίσει την επιχείρησή του λόγο οικονομικών προβλημάτων, με αποτέλεσμα να ανακαλύψει το δωρεάν φως χωρίς ρεύμα.

 

Η απλή τεχνολογία αυτής της ιδέας απαιτεί ένα πλαστικό μπουκάλι, 1, 1,5 η 2 λίτρων, γεμάτο με νερό και μερικές σταγόνες χλωρίνη για την αποφυγή ανάπτυξης φυτοπλαγκτόν, ώστε να κρατήσει για τουλάχιστον πέντε χρόνια. Το μπουκάλι τοποθετείται με κόλλα σε μία βάση η οποία θα πρέπει να εφαρμόζει με τη σκεπή, επίσης με κόλα, για την αποφυγή διαρροής από βροχές. Το αποτέλεσμα είναι να έχετε μία πηγή φωτός που αποδίδει το ίδιο όσο μια συνηθισμένη λάμπα 55-60W!

 

200,000 τέτοιες λάμπες έχουν εγκατασταθεί μέχρι σήμερα στις οροφές φτωχών οικογενειών παγκοσμίως, οι περισσότερες από τις οποίες ζούνε χωρίς ρεύμα, και τα σπίτια τους ακόμη και τις πρωινές ώρες είναι σκοτεινά. Η οργάνωση ελεύθερης διακίνησης "One liter of light" (ένα λίτρο φωτός) που οργανώθηκε από τον Illac Diaz από τις Φιλιππίνες, στοχεύει στην εγκατάσταση ενός εκατομμυρίου λαμπών μέσω δωρεάν ενημέρωσης και βοήθειας, έως το τέλος του 2015.

 

©BBC news

 

Το θετικό είναι πως μπορείτε να έχετε δυνατό φως σε σκοτεινούς χώρους χωρίς ρεύμα, αλλά μόνο για όσο υπάρχει έξω φως. Το πρόβλημα αυτό μπορεί να λυθεί με την τοποθέτηση μερικών LED μέσα στο μπουκάλι τα οποία θα ανάβουν το βράδυ, τροφοδοτούμενα από μια μπαταρία η οποία σε όλη τη διάρκεια της ημέρας θα φορτώνει μέσω ηλιακών κυψελών.

 

© Χριστόφορος Χιονίδης , για το Blackstate.gr

 

 

Αναδημοσιευμένο από το http://www.blackstat...ykali-nero.html

[Χρήστος Λάππας 25,411]

The solar road in the Netherlands is working even better than expected

Hell yeah, solar roads!

FIONA MACDONALD

11 MAY 2015

The Netherlands made headlines last year when it built the world's first solar road - an energy-harvesting bike path paved with glass-coated solar panels.

Now, six months into the trial, engineers say the system is working even better than expected, with the 70-metre test bike path generating 3,000 kWh, or enough electricity to power a small household for a year.

"If we translate this to an annual yield, we expect more than the 70kwh per square metre per year," Sten de Wit, spokesman for SolaRoad, the group behind the project, told Tarek Bazley at Al Jazeera. So just imagine the potential if we covered all our roads in the stuff.

It’s this kind of thinking that got the Internet so hyped-up over Solar Roadways last year - a crowd-funded project that aimed to power the entire US with solar-covered roads. However, the Netherlands became the first country to put the idea into practice with their installation in Krommenie, a town north of Amsterdam.

The solar panels used on the Dutch bike path are sandwiched between glass, silicon rubber and concrete, and are strong enough to support 12-tonne fire trucks without any damage. Each individual panel connects to smart metres, which optimise their output and feed their electricity straight into street lighting, or the grid.

The engineers spent five years creating the system to be durable. "If one panel is broken or in shadow or dirt, it will only switch off that PV panel," said Jan-Hendrik Kremer, Renewable Energy Systems consultant at technology company Imtech.

More than 150,000 cyclists rode over the solar panels during the trial, and so far they’ve only noticed one fault - a small section of a coating, which provided grip to the surface, has become delaminated due to temperature fluctuations. The team at SolaRoad is now working to improve this coating.

"We made a set of coatings, which are robust enough to deal with the traffic loads but also give traction to the vehicles passing by," Stan Klerks, a scientist at Dutch research group TNO - the parent company, which came up with SolaRoad - told Bazley from Al Jazeera.

The researchers design the panels to not only let in as much light as possible, but also to last at least 20 years - a similar lifespan to rooftop solar panels.

Studio Roosegaarde

The potential is pretty huge. Not only could the roads generate enough electricity to power local households, but they can also provide some amazing lighting opportunities. Last year a solar road was installed in the Netherlands by design lab Studio Roosegaarde, which sucked up the Sun's energy during the day and then guided cyclists at night using beautiful Vincent Van Gogh 'Starry Starry Night- inspired LED lights.

SolaRoad is now working with local councils around the Netherlands to try to roll the technology out in other provinces. A similar agreement has also been signed with California in the US. Bring on the future.

Πηγή: http://www.sciencealert.com/solar-roads-in-the-netherlands-are-working-even-better-than-expected

 

[ΜΙΚ 17,614]

Σε αυτό το σημείο καλό είναι να ξέρετε ότι αυτό που τα άχρηστα κανάλια είπαν για το tesla και καλά σαν επανάσταση...απλά είναι πανάκριβο και εμπορευόμαστε τέτοια προιόντα εδώ και 5 χρόνια. περίπου 40- 60000 ευρώ για να έχεις ρεύμα για ένα σπίτι 100 τετραγωνικά

 

Ότι δείτε στα κανάλια διπλοτσεκάρετέ το ότι θυμούνται χαίρονται και είναι γεμάτα ανακρλιβειες προκειμένου να μοιάζει με κάτι σημαντικό

[Kyriakoschar 6,029]

Σε αυτό το σημείο καλό είναι να ξέρετε ότι αυτό που τα άχρηστα κανάλια είπαν για το tesla και καλά σαν επανάσταση...απλά είναι πανάκριβο και εμπορευόμαστε τέτοια προιόντα εδώ και 5 χρόνια. περίπου 40- 60000 ευρώ για να έχεις ρεύμα για ένα σπίτι 100 τετραγωνικά

 

Ότι δείτε στα κανάλια διπλοτσεκάρετέ το ότι θυμούνται χαίρονται και είναι γεμάτα ανακρλιβειες προκειμένου να μοιάζει με κάτι σημαντικό

 

Αν λες Μιχάλη, το θέμα με το Powerwall, δεν το παρακολούθησα καλά, αλλά με τα λίγα που διάβασα, δεν βλέπω κάποια τεχνική διαφορά με μία οποιαδήποτε κλασσική εγκατάσταση αυτόνομου ΑΠΕ. Η διαφορά είναι στην τιμή (πολύ πιο ακριβό) και στο μέγεθος (μικρότερο). Το marketing κάνει τα πάντα

Edited May 12, 2015 by Kyriakoschar

[wraith 6,406]

Κάτι σαν το iPhone ένα πράγμα...

 

Το έχει παίξει σωστά η Tesla πάντως και μπράβο τους!

[Χρήστος Λάππας 25,411]

Αν καταφέρει να φέρει την ενεργειακή αυτονομία σε κάθε σπίτι, όπως το iPhone κατάφερε να βάλει τα smartphones σε κάθε τσέπη, τότε έχουμε μια εξαιρετικά σημαντική εξέλιξη, ανεξαρτήτως του αν η τεχνολογία προϋπήρχε.

[ΜΙΚ 17,614]

οκ 60.000 ευρω κύριοι. Ποιός θα τα δώσει μετρητά? Μακάρι να πουλήσει καλά αλλά στην αγορά σήμερα με απλό google θα το βρεις με 55 και ούτε με 55 πουλάει

 

πρέπει να πέσει πολύ η τιμή των μπαταριών. η αίσθησή μου είναι ότι γύρω στο 2025 και αν τα 60 θα γίνουν 30 να έχεις μια λογική απόσβεση.

 

Μακάρι γιατί τα φβ έχουν πια πολύ καλή τιμή.

[Kyriakoschar 6,029]

Ένα τέτοιο marketing να ειχε και το ΥΠΕΚΑ

[wraith 6,406]

Αν καταφέρει να φέρει την ενεργειακή αυτονομία σε κάθε σπίτι, όπως το iPhone κατάφερε να βάλει τα smartphones σε κάθε τσέπη, τότε έχουμε μια εξαιρετικά σημαντική εξέλιξη, ανεξαρτήτως του αν η τεχνολογία προϋπήρχε.

Αδειάζοντας σημαντικά την άλλη τσέπη...

[vro 10,284]

δεν ειναι τοσο απλο

περα απο τιμη και διαρκεια ζωης

εχουμε

ισχύ, αριθμος κύκλων επαναφορτησης, διαρκεια ανευ φορτιου κλπ κλπ

πιστευω οτι οταν τα δουμε σε οχηματα πραγματικα μαζικης παραγωγης θα μιλάμε για το αν εχει νοημα η συνδεση με την δεη ή η τοποθετηση μικτου συστηματος παραγωγης.

πάντως για μενα το μελλον ειναι η μειωση της ισχυος των συσκευων και εχουμε αρκετο δρόμο ακομα ειδικα στο μαγειρεμα, κλιματισμο και πλυσιμο. Σε φωτισμο και ηλεκτρονικα παμε καλά.

[ΜΙΚ 17,614]

σωστά. όλες οι μπαταριες μιλαμε για ζωη δεκαετίας μαξ

[vro 10,284]

http://ophioussa.blogspot.gr/2015/05/blog-post_29.html

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How a North Carolina village came to believe solar farms were 'killing the town'

As the state’s solar industry booms, the growth of clean energy has stirred skepticism in the tiny rural town of Woodland, population 800

Woodland welcomed the solar project – at first. Photograph: Daniel Leal-Olivas/PA

Max Blau in Atlanta, Georgia

Monday 21 December 2015 17.01 GMT Last modified on Monday 21 December 2015 17.27 GMT

 

Not much grows in Woodland. Farmers cultivate small amounts of tobacco, pick cotton, and harvest soybeans in this north-eastern North Carolina town. This 800-person community with roughly twice the national poverty rate has seen better days.

 

But then, clean energy companies arrived. They saw opportunity and started building solar farms in the town – bringing a new kind of industry to a place that hadn’t seen much in the way of economic development.

The community welcomed the change with open arms – at first.

 

Thanks to enticing tax credits and a state law requiring utilities to use some clean energy, solar power produced in North Carolina generated more than 1,000 GWh – enough to power more than 90,000 average Americans’ homes for a year – in just the first six months of 2015.

 

Up until recently, Woodland was a microcosm of this statewide trend. The rural town, located 90 minutes south-west of Norfolk, Virginia, had approved the installation of three solar farms on the outskirts of town, with the first of those projects nearing completion.

 

Earlier this month, however, that reputation vanished as the town’s leaders approved a solar moratorium after residents skeptical of clean energy’s effects on the town were heard around the world.

 

North Carolina-based Strata, one of the nation’s largest solar companies, wanted to rezone a 42-acre farm on the eastern edge of Woodland off Highway 258, the town’s main road. If the project had been approved, Strata senior vice-president of strategy Brian O’Hara says, the company intended to build a five-megawatt solar farm that would have generated enough electricity to power about 750 homes – roughly double the number of households in Woodland.

 

'Game-changing' perovskite solar tech could be cheaper and more efficient

On 3 December, company officials arrived in Woodland with hopes of gaining approval. At the town’s monthly council meeting that evening, local officials listened to officials present their plan and allowed the public to weigh in on the rezoning effort, as they always did. Yet Strata’s pitch didn’t go as planned.

 

According to the local newspaper the Roanoke-Chowan News-Herald, Woodland resident Jean Barnes presented a petition on behalf of locals that opposed additional solar farms and personally requested a referendum for any future proposals.

 

Another resident, Mary Hobbs, lamented the loss of her home’s value as the result of what seemed like endless solar panels being installed.

 

The opposition intensified when one couple, Jane and Bobby Mann, claimed that solar advocates had secret agendas. Jane Mann expressed fears that solar farms had boosted cancer rates in the area. Bobby warned businesses would stay away from the town because the solar industry would capture too much of the town’s sun.

“You’re killing your town,” Bobby Mann said at the meeting. Though Strata has experienced opposition in the past, O’Hara says, the ferocity of the remarks came as a shock to the renewable energy company.

 

The Woodland town council ultimately voted against the rezoning because of their constituents’ concerns given that “it would create a situation in which the town would be completely surrounded by solar farms”. In case that wasn’t enough, local officials went one step further to pass a moratorium for all future solar farms.

 

“How would you and your family like to live in the middle of a solar farm, surrounded on all four sides?” Woodland councilman Ron Lane told the News & Observer. “We have approved three solar farms on almost three points of the compass. This would have completely boxed the town in with solar farms.”

 

Despite some legitimate concerns, Woodland became the subject of ridicule as some of the public’s remarks went viral on websites such as Huffington Post, Ars Technica, and Daily Kos aggregated their remarks (one headline read: “North Carolina citizenry defeat pernicious Big Solar plan to suck up the Sun”). Since the meeting, phones haven’t stopped ringing at Woodland’s city hall and, according to Woodland’s mayor, Kenneth Manuel, have turned into a distraction from the government’s daily operations.

 

“We’ve just been inundated, as you could imagine,” Manuel told the Guardian. “We want to set the record straight. Some folks have got it really twisted. They didn’t care about what the truth was; they wanted to super-sensationalize it, as folks will do.”

 

The worldwide spotlight has rattled the small town. But Manuel insisted Woodland remains a place that embraces clean energy, given its three solar farms already on the way. However, he drew the line at four solar farms, as it would give the town a disproportionate number at a time when other businesses would better serve local people. “We want to attract more businesses,” Manuel said. “We support solar farms and clean energy – clearly, that’s indicative – given that we already have three solar farms approved. We’d also like to attract other businesses like a supermarket or some kind of shopping center to buy clothing.”

 

Around the state, Strata’s O’Hara said, the company has seen an uptick in efforts to undermine the spread of solar from politicians, lobbyists and organizations. More recently, as the company has made bids to build solar farms, more residents looking to curb clean energy have taken stands based on flawed arguments and falsehoods. That’s become a source of frustration for a company trying to lessen a coal-reliant state’s dependency on non-renewable energy sources.

 

The Tea Party leader taking a stand for solar energy: 'I will do what's right'

 

“The more opponents of renewable energy spread misinformation, the more it opens the door for comments like this,” O’Hara says. “These folks had questions, and they were what they were, probably because they have heard that misinformation before.”

 

With no additional solar facilities planned for Woodland, Manuel hopes things return to the way they were before the December meeting placed the town on the map. What does that look like for this Tar Heel town? Less solar farming, and more of the farming that’s long remained the bedrock of this community for decades.

 

“We’re going to move on,” Manuel told the Roanoke-Chowan News-Herald. “We will be vindicated by the truth.”

 

Πηγή: http://www.theguardian.com/us-news/2015/dec/21/north-carolina-woodland-solar-farms

[wraith 6,406]

Επικό ανάγνωσμα. Θα μπορούσε να ήταν και από μέρος της Ελληνικής επικράτειας!

 

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