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Päikeseenergia / Solar energy

Päikeseenergia / Solar energy

Taavi @ 23.01.2004 10:03 | Registreerunud: 01.04.2003

Geniaalne ja lihtne - analoogne sellele "päikeseahjule" toiduvalmistamiseks. Tööpõhimõte väga lihtne ja suht mõistetav + suur kasutegur.

Huvitav kas sel püssil eestis ka mingit pointi oleks?

Dish-Stirling system concentrates the solar radiation and converts it at a very high efficiency into electrical energy. It’s components are:

- the parabolic concentrator (mirror)
- the tracking system
- the solar heat exchanger (receiver)
- the Stirling engine with electric generator

Tests on our prototypes described below have demonstrated net solar-to-electric conversion efficiencies as high as 22%. This is significantly higher than any other solar technology today.
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http://www.sbp.de/en/fla/index.html

Sitemap -> Dish-Stirling ->
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või siis:
Contact -> Downloads

Taavi @ 23.01.2004 10:40 | Registreerunud: 01.04.2003

krt ja see poiss on ka kreisi ... kasvuhoone efektil/korstna lõõri põhimõttel töötav värk ... vaadake vilmi ...

+ skemaatiline tööpõhimõte:
http://www.sbp.de/en/fla/projects/solar/aufwind/pages_auf/ak.htm

Taavi @ 23.01.2004 10:53 | Registreerunud: 01.04.2003

kõige parem viis otse infini jõuda:

http://www.sbp.de/en/fla/index.html

proovige see lollakas reklaamaken kinni saada vajutades seda close nuppu seal - a eelnevalt hoidke hiire kursorit nats aega paigal u samas kohas, et nupp nähtavale ilmuks

siis kui aken sulgunud võite juba otse piltidel klõpsida - päikese energia värk jääb just selle orantsi osa alla

vajutades pildile tuleb pildi kohale kiri - kui kirja peale liikuda muutub see orantsiks ja kui nüüd seda vajutada, siis avaneb lõpuks õige koht ..

KRT MIKS ON VAJA KEERULISI SAITE TEHA?

solarcooking

Taavi @ 23.01.2004 12:46 | Registreerunud: 01.04.2003

märksõna solarcooking annab ka päris huvitavaid tulemusi:
http://www.google.com/search?hl=et&lr=&ie=UTF-8&oe=UTF-8&q=solarcooking&sa=N&tab=iw

Orgaanilised päikesepatareid

Taavi @ 15.12.2005 16:49 | Registreerunud: 01.04.2003

päris uus ja huvitav ja hea kraam tundub olema

http://www.re-f-use.com/
http://www.ecn.nl/zon/research/thin_film/index.en.html

New Flexible Plastic Solar Panels Are Inexpensive And Easy To Make

Urmet @ 17.09.2007 12:55 | Registreerunud: 17.04.2003

Science Daily — Researchers at New Jersey Institute of Technology (NJIT) have developed an inexpensive solar cell that can be painted or printed on flexible plastic sheets. "The process is simple," said lead researcher and author Somenath Mitra, PhD, professor and acting chair of NJIT's Department of Chemistry and Environmental Sciences. "Someday homeowners will even be able to print sheets of these solar cells with inexpensive home-based inkjet printers. Consumers can then slap the finished product on a wall, roof or billboard to create their own power stations."

Harvesting energy directly from abundant solar radiation using solar cells is increasingly emerging as a major component of future global energy strategy, said Mitra. Yet, when it comes to harnessing renewable energy, challenges remain. Expensive, large-scale infrastructures such as wind mills or dams are necessary to drive renewable energy sources, such as wind or hydroelectric power plants. Purified silicon, also used for making computer chips, is a core material for fabricating conventional solar cells. However, the processing of a material such as purified silicon is beyond the reach of most consumers.

"Developing organic solar cells from polymers, however, is a cheap and potentially simpler alternative," said Mitra. "We foresee a great deal of interest in our work because solar cells can be inexpensively printed or simply painted on exterior building walls and/or roof tops. Imagine some day driving in your hybrid car with a solar panel painted on the roof, which is producing electricity to drive the engine. The opportunities are endless. "

The science goes something like this. When sunlight falls on an organic solar cell, the energy generates positive and negative charges. If the charges can be separated and sent to different electrodes, then a current flows. If not, the energy is wasted. Link cells electronically and the cells form what is called a panel, like the ones currently seen on most rooftops. The size of both the cell and panels vary. Cells can range from 1 millimeter to several feet; panels have no size limits.

The solar cell developed at NJIT uses a carbon nanotubes complex, which by the way, is a molecular configuration of carbon in a cylindrical shape. The name is derived from the tube's miniscule size. Scientists estimate nanotubes to be 50,000 times smaller than a human hair. Nevertheless, just one nanotube can conduct current better than any conventional electrical wire. "Actually, nanotubes are significantly better conductors than copper," Mitra added.

Mitra and his research team took the carbon nanotubes and combined them with tiny carbon Buckyballs (known as fullerenes) to form snake-like structures. Buckyballs trap electrons, although they can't make electrons flow. Add sunlight to excite the polymers, and the buckyballs will grab the electrons. Nanotubes, behaving like copper wires, will then be able to make the electrons or current flow.

"Using this unique combination in an organic solar cell recipe can enhance the efficiency of future painted-on solar cells," said Mitra. "Someday, I hope to see this process become an inexpensive energy alternative for households around the world."

"Fullerene single wall carbon nanotube complex for polymer bulk heterojunction photovoltaic cells," published June 21, 2007 in the Journal of Materials Chemistry by the Royal Society of Chemistry, details the process.


Note: This story has been adapted from a news release issued by New Jersey Institute of Technology.
Date: July 19, 2007

Retk Päikesele ehk lööme hambad suurde apelsini!

Urmet @ 21.05.2008 15:39 | Registreerunud: 17.04.2003

Teadlased tahaks lähemalt näha, et millised ikka on need Päikse laigud ja kuidas ennustada magnettorme.

2015 kosmoses näeme!

Rohkem infot:
http://edition.cnn.com/2008/TECH/05/18/solar.probe/index.html

PÄIKE SÄRAB VEEPEAL EREDALT

Urmet @ 27.05.2008 09:33 | Registreerunud: 17.04.2003


Esimene päikseenergial kihutav kiirpaat.


http://www.czeers.com/czeers.html

Hõõru mind sisse faktor 40-ga!

Urmet @ 14.07.2008 11:38 | Registreerunud: 17.04.2003

täna lugesin minutist välja sellise loo:


Päikesepaneelide efektiivsus lihtsalt suurendatav

MIT teadlased on parandanud päikesepaneelide efektiivsust võttes kasutusele spetsiifilised kattematerjalid. Need kergesti peale kantavad materjalid võivad suurendada praegu kasutatavate päikesepatareide energiatootmist üle 40 korra ilma vajaduseta jälgida otsest suunatust päikesele. Asja võti seisneb selles, et päikesevalgust kogutakse sel viisil üle kogu paneeli pinna ning "suunatakse" äärtesse, kus asuvad päikesepatareid. Seega väheneb kallite päikesepaneelide pindala ja sellega ka kogu süsteemi maksumus. Paigaldades igale valguse lainepikkusele oma "koguja" kihi ning sellele vastava päikesepaneeli võimaldab see sama pindala pealt saada märgatavalt rohkem elektrienergiat. Lisaks muule võib päikesepaneeli pind jääda läbipaistvaks, pakkudes välja "päikeseakna" idee.

http://web.mit.edu/newsoffice/2008/solarcells-0710.html

Rebi plastikut ehk kui ühele plastmassile lasta päikest peale siis on ta mootor

Urmet @ 30.07.2008 10:55 | Registreerunud: 17.04.2003


Uuringutiim mida juhib professor Tomiki Ikeda (Tokyo Institute of Technology) on välja arendanud maailma esimese päikeseenergial töötava plastikmootori.

Kui tavalised päiksemootorid koguvad, transpordivad, säilitavad ja konverteerivad valgusenergiat elektrienergiaks siis nüüd uudne tehnika lubab kohe otse valgusel mehaaniliseks energiaks muutuda. Seda tänu plastikule mille molekulaarstruktuur kahaneb ja paisub valgustatult olenevalt valguse lainepikkusele.

Ikeda alustas tööd valgusjõul töötava mootoriga aastal 2003, kohe peale avastust, et plastikühend mis sisaldas azobenseeni (http://en.wikipedia.org/wiki/Azobenzene) kahanes ultravioletse valguse mõjul ning naases esialgsesse asendisse peale nähtava valguse kätte sattumist. Peale seda on Ikeda tiim tegelenud selle materjali omaduste parandamisega ning töötanud välja mootorit mis otseselt valguse toimel mehaanilist energiat toodaks.

Esimesed testid miniatuursete mootoritega on õnnestunud. Edasi on tiimil veel palju arendustööd ning tulevikusihiks on võetud plastikautod ning muud plastikust valguse jõul töötavad seadeldised.

Uurimustööde tulemused avaldati 19 juulil Saksa keemiaajakirjas Angewandte Chemie.

http://www.pinktentacle.com/2008/07/light-sensitive-shape-shifting-plastic-drives-motor/

"love working with passionate people who want to help address climate change and poverty" … Nicole

Urmet @ 27.08.2008 13:54 | Registreerunud: 17.04.2003

Proua tegi päikesepatarei süsteemi lihtsamaks - kasutades pizzaahju. Nüüd kõik saavad päikeselaksu soodsalt kätte!

Kui ise ei saa tehtud siis viie aasta pärast kõigile tehnoloogia saadaval.

Artikkel:
http://www.smh.com.au/news/energy-smart/thinking-outside-the-square-finds-light-in-oven/2008/08/19/1218911717526.html

Olukorrast päikeseenergia sektoris

Urmet @ 05.12.2008 10:54 | Registreerunud: 17.04.2003

Päikeseenergia sektoris on turgudel olnud viimasel ajal üsna rasked ajad, aktsiahinnad on tugevalt kukkunud.

Võttes kokku peamisi tegureid, mis sektori ettevõtteid on rõhumas, võib välja tuua järgmised:
1. Nõudluse vähenemine – makrotegurid
2. Raskemad finantseerimistingimused – finantskriis
3. Tugevnev konkurents - surve marginaalidele
4. Valuutakursside mõju - toodang euroalal vähem tasuvam
5. Toorainetrendide mõjud

Suurem osa artiklist Tarkinvestoris:
http://www.tarkinvestor.ee/analysis.php?idee=87

The ugly side of solar panels

Urmet @ 22.04.2009 11:19 | Registreerunud: 17.04.2003

In some cases, producing electricity by solar panels releases more greenhouse gases than producing electricity by gas or even coal.

Producing electricity from solar cells reduces air pollutants and greenhouse gases by about 90 percent in comparison to using conventional fossil fuel technologies, claims a study to be published this month in “Environmental Science & Technology”. Good news, it seems, until one reads the report itself. The researchers come up with a solid set of figures. However, they interpret them in a rather optimistic way. Some recalculations (skip this article if you get annoyed by numbers) produce striking conclusions.

Solar panels don’t come falling out of the sky – they have to be manufactured. Similar to computer chips, this is a dirty and energy-intensive process. First, raw materials have to be mined: quartz sand for silicon cells, metal ore for thin film cells. Next, these materials have to be treated, following different steps (in the case of silicon cells these are purification, crystallization and wafering). Finally, these upgraded materials have to be manufactured into solar cells, and assembled into modules. All these processes produce air pollution and heavy metal emissions, and they consume energy - which brings about more air pollution, heavy metal emissions and also greenhouse gases.

Edasi loe Lowtech-i artiklist.

"Surprisingly, the key data of the calculation (the amount of CO2 emitted per square meter of solar panels) are nowhere to found in the report"

This map shows the amount of solar energy in hours, received each day on an optimally tilted surface during the worst month of the year. For a more detailed view of solar insolation (in kWh/m²/yr) see the links above.

Solar radiation and photovoltaic electricity potential

Urmet @ 22.04.2009 11:23 | Registreerunud: 17.04.2003

The maps represent yearly sum of global irradiation on horizontal and optimally inclined surface, 10-years average of the period 1981-1990 [kWh/m2]. The same colour legend represents also potential solar electricity [kWh/kWp] generated by a 1 kWp system per year with photovoltaic modules mounted at an optimum inclination and assuming system performance ratio 0.75.

JRC

Solar Power From Space by 2016

Taavi @ 23.04.2009 22:41 | Registreerunud: 01.04.2003

Uued lahendused kosmosest päikeseenergia kogumiseks - põhjust on, sest kosmoses on tänu atmosfääri puudumisele 8-10 korda suurem efektiivsus.

Vahendab Inhabitat

Urmet @ 24.04.2009 10:13 | Registreerunud: 17.04.2003


Ojee see on lahe asi a ma ei saa aru, nad ju peavad kogu selle energi suunama kuidagi läbi atmosfääri maale teatud punkti, et ma ei mõista kuidas see asi töötab.... Natuke tundub, et mingid tüübid teevad planeedist siis hiigelsuure mikrolaineahju. Kuidas see firma siis hakkab nagu energit mõõtma mida ta müüb? Kuna saab siis väita, et kõik tema energiat kasutavad siis maksustab ta kõik ära :) Ajal kui mina mõtlen kuidas saaks loobuda kõigist nendest raadiolainetest mis päevadläbi mind läbivad, mõeldakse välja üha uusi....Rohem tundub see mingi dzeimsbondiliku surmakiirena, mis ju usakatel väidetavalt juba seal üleval on. Et siis järgmise aktshiõnfilmina võiks hakata juba mõtlema, et mis juhtub kui kõik läheb väga jubedasti valesti. Heh.


Tesla

Taavi @ 24.04.2009 10:51 | Registreerunud: 01.04.2003

Põgusalt on juttu energia maapinnale saamisest - millegipärast on Inhabitat hetkel maas, aga mäletamist mööda olid võimalikud variandid el.mag. lainete või laseriga.

Energia liigutamist ilma traadita, lihtsalt läbi õhu uuris Tesla. Väidetavalt ta isegi avastas mingi võimaluse, aga kuna "vaba energia" ei ole, mõõdetav ja seeläbi maksustatav, ei ole praeguse energiasüsteemi kontrollijad sellest huvitatud. ... Teslast jm. vandenõu teooriatest võibki jahuma jääda, aga teeks seda mingis omaette teemas.


Film Teslast

Juuksekarvadest saab 9V/18W päikesepaneeli 38 dollari eest

Taavi @ 16.09.2009 22:41 | Registreerunud: 01.04.2003

... täiesti kreisi idee kasutada juuksekarvu päikesepaneeli toorainena ... tuleb odavam kui räni, taastoodab, ja juuksed/karvad säilivad väga kaua ...

Did you know that melanin, the pigment in hair, is light sensitive and can be used as a conductor? Well, that’s what an 18 year old in Nepal recently discovered, and is now using human hair to replace silicon in solar panels. Since the price of hair is considerably cheaper than silicon, this enterprising youth may have just found a breakthrough technology to help bring down the cost of solar and give thousands of people in developing nations access to affordable renewable energy.

Malin Karki had already been trying to create affordable renewable energy from hydro currents for a few years, but the project had become too expensive. But then Karki, who attends school in Kathmandu, started reading a book by Stephan Hawking that discussed ways of creating static energy from hair. From this idea, Karki realized that melanin was one of the factors in energy conversion, and that it could possibly serve as a substitute conductor. He and four other classmates worked on a prototype, which they found could charge a cell phone or a pack of batteries for lighting.
The panels themselves are 15 inches square and can produce 9V or 18W of power and cost around $38 to produce. Karki thinks that if they were mass produced though, they would cost half as much. In Nepal, human hair costs about 25¢ for half a kilo and can last for several months. Hair is also basically a renewable resource and can be replenished by the owner of the solar panel as it wears out. This low cost and low tech device could be a revolutionary step in solar power bringing down the cost of the technology, bringing power to the masses and using materials which are common to everyone in the world.

ikka Inhabitat

$555 Miljardiline Sahara Päikesepaneelide Vöö Projekt liigub

Urmet @ 09.11.2009 15:16 | Registreerunud: 17.04.2003


Suur samm siiani tundunud ulmeprojekti teostamise suunas on astutud. Maailma suurim taastuveneriga projekt. 12 firmat on allkirjastanud kokkuleppe millega rahastatakse Sahara kõrbe projekti ning liigutakse edasi selle valmimise suunas.

Loe asja kohta täpsemalt Inhabitatist.

Taavi @ 12.01.2010 13:26 | Registreerunud: 01.04.2003

Bertrand Piccard's solar-powered adventure

Bertrand Piccard was born in a family of firsts. His father, Jacques, together with Dan Walsh of the US, was the first man to reach the deepest point of the world's oceans, the Mariana Trench, in 1960. Almost 30 years earlier, his grandfather, Auguste, first ballooned into the stratosphere. While they went up and down, Bertrand went horizontal and in 1999, together with Brian Jones of Britain, completed the first-ever nonstop balloon circumnavigation of the globe, flying more than 45,000 km in 20 days.

Now, in a hangar near Zurich, a team of scientists and engineers around Piccard and co-pilot André Borschberg is building Solar Impulse, an unconventional aircraft designed to circumnavigate the Earth powered by solar energy, flying day and night (yes, when the Sun is "off"). The just-unveiled prototype has the weight of a car but the wingspan of an Airbus. Piccard hopes for test flights in the first half of 2010, and possibly a long flight in 2011, before attempting to fly around the Earth.

+ SOLARIMPULSE

Bertrand Piccard 2009-12-19
There is no planet B

As I write these lines, I do not know when we will have - or even indeed if we will have - a final document, nor what it will contain. But I have had an opportunity to study the draft agreement. It lacks ambition, but this was to be expected. For me it also contains two surprises:

1) It speaks of course of the danger of CO2 emissions. But not a line on the dangers of their origin, that is our aberrant dependence on fossil fuels. Even without climate change, it is urgent to apply those technologies that allow us to do without oil. Its increasing rarity, and price rises that will inevitably ensue, will destroy our industrial and economic system well before the Maldives Islands have disappeared under rising sea levels.

2) There is more talk of financial assistance to poor countries than of solutions to reduce CO2 emissions. This is not a bad thing in itself, as our planet will never be a safe place if we leave half of its population trailing behind the rest of us. But one does get the impression that this item ought to be accompanying the concrete measures to combat climate change and not replacing them in the negotiations. But fair enough in such a context: after neglecting them, and at times slapping them in the face, the Third World countries are becoming essential partners in the search for a global solution.

And if, with the 100 billion we are planning to pay to them, the rich countries were to add a few apologies for polluting the planet whilst the poorest countries did not even have the wherewithal to do so. This will never happen, but it does one good to write it.

Bertrand


Solyndra

Taavi @ 18.01.2010 13:07 | Registreerunud: 01.04.2003

Solyndra toodab valgetele katustele silindrilisi päikesepaneele.


Meie Päikeseline tulevik ...

Taavi @ 15.03.2010 13:32 | Registreerunud: 01.04.2003


Postitusele lisatud failid:
Velux20issue2012.pdf

Teras, mis sulab Päikese jõul

Urmet @ 22.03.2010 11:02 | Registreerunud: 17.04.2003





James May "Big Ideas" seriaal. Päikeseahi, mis koondab valguskiiri peeglitega ühte punkti, saavutab temperatuure kuni 3500 kraadi tseltsiust. See aga on juba piisav energia, et sulatada terast.

Solar furnace & solar power tower

Taavi @ 22.03.2010 11:34 | Registreerunud: 01.04.2003

Ma millegipärast arvasin, et see tehnoloogia on suht arenenud, aga tuleb välja, et maailmas on vaid mõned taolised projektid teostatud.

The solar furnace at Odeillo in the Pyrenees-Orientales in France can reach temperatures up to 3,500 °C
Solar furnace

Analoogse peegelsüsteemi ja torniga variant on elektri tootmiseks ka olemas - seal siis peeglid soojendavad vett ja panevda turbiini pöörlema.
Solar power tower

TTÜ katusel olevad paneelid

Taavi @ 22.03.2010 15:09 | Registreerunud: 01.04.2003

TTÜ katusele on paigutatud päikesepaneelid, millede tootlikust jm. infi saab onlainis jälgida.

Huvitav, et aprill on kõige suurema tootlikusega kuu - ma arvasin, et "parim aeg" on meil suvi.

http://www.pv.ttu.ee/

Graafikut vaadates jätke meelde põhipostulaat:
Detsembri energiahulk on ca 12x väiksem aprilli omast.
Üldplaanis on see detsembri jõnks suht järsk, mis tähendab, et muul osal aastast oleks päikeseenergiast tolku küll - 5 kuud aastast on alla aprilli keskmist ja ülejäänud 7 on üle keskmise ja pigem aprilli lähedal.