Ogled vira Shranjevanje energije z vztrajnikom

[[File:G2 front2.jpg|right|thumb|[[NASA]] G2 vztrajnik]]
'''Shranjevanje energije z vztrajnikom''' ([[angleščina|ang]]. Flywheel Energy Storage - FES) shranjuje energijo, tako da pospeši [[vztrajnik]] (rotor) do zelo velikih obratov. Ko vztrajniku dodajamo energijo se poveča vrtilna hitrost, ko pa je odvzemujemo se zmanjša.

Moderni FES sistemi uporabljajo vztrajnike iz zelo močnih kompozitov iz [[Karbonska vlakna|karbonskih vlaken]], imajo [[magnetni ležaj|magnetne ležaje]] in se vrtijo pri hitrostih 20 000 do čez 50 000 obratov na minuto. Celotna struktura je v vakuumu za zmanjšanje zračnega upora.<ref name="ScienceNews">{{Cite journal
| last1 = Castelvecchi
| first1 = Davide
| title = Spinning into control: High-tech reincarnations of an ancient way of storing energy
| doi = 10.1002/scin.2007.5591712010
| journal = Science News
| volume = 171
| issue = 20
| pages = 312–313
| date = May 19, 2007
| url = http://sciencewriter.org/flywheels-spinning-into-control/
| access-date = 2014-06-04
| archive-date = 2014-06-06
| archive-url = https://web.archive.org/web/20140606223717/http://sciencewriter.org/flywheels-spinning-into-control/
| url-status = dead
}} {{Webarchive|url=https://web.archive.org/web/20140606223717/http://sciencewriter.org/flywheels-spinning-into-control/ |date=2014-06-06 }}</ref>
Taki vztrajniki dosežejo vrtilno hitrost v nekaj minutah, hitreje kot nekateri drugi sistemi shranjevanja energije. Vztrajniki so povezani z električnim motorejm/generatorjem.
[[File:Example of cylindrical flywheel rotor assembly.png|thumb|right|Glavni sestavni deli vztrajnika]]

Prva generacija vztrajnikov je uporabljala velik jekleni vztrajnik, ki se je vrtel na konvencionalnih (mehanskih) ležajih. Novi vztrajniki uporabljajo karbonska vlakna, ki imajo večjo [[natezna trdnost|natezno trdnost]] in so precej lažji.<ref>{{Navedi splet |url=http://www.flybridsystems.com/F1System.html |title=Flybrid System KERS using carbon fiber flywheel |accessdate=2014-06-04 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303195458/http://www.flybridsystems.com/F1System.html |url-status=dead }}</ref>

FES sistemi imajo dolgo življenjsko dobo in zahtevajo malo vzdrževanja. Število ciklov je nekje 10<sup>5</sup> do. 10<sup>7</sup><ref name="Investire">{{Navedi splet |url=http://www.itpower.co.uk/investire/pdfs/flywheelrep.pdf |title=Storage Technology Report, ST6 Flywheel |accessdate=2014-06-04 |archive-date=2013-01-14 |archive-url=https://web.archive.org/web/20130114062530/http://www.itpower.co.uk/investire/pdfs/flywheelrep.pdf |url-status=dead }} {{Webarchive|url=https://web.archive.org/web/20130114062530/http://www.itpower.co.uk/investire/pdfs/flywheelrep.pdf |date=2013-01-14 }}</ref>[[Energetska gostota]] je okrog 100–130&nbsp;W·h/kg ali 360–500 kJ/kg),<ref name="Investire"/><ref name="pddnet">{{navedi splet |title=Next-gen Of Flywheel Energy Storage |url=http://www.pddnet.com/article-next-gen-of-flywheel-energy-storage/ |publisher=Product Design &amp; Development |accessdate=2009-05-21 |archive-date=2010-07-10 |archive-url=https://web.archive.org/web/20100710052927/http://www.pddnet.com/article-next-gen-of-flywheel-energy-storage/ |url-status=dead }}</ref>. Imajo tudi veliko izhodno moč. Izkoristek je lahko tudi čez 90%. Tipične kapacitete so  3-133 kWh. Pospeševanje je po navadi manj nko 15 minut. <ref name="Distributed Energy">{{navedi splet |last=Vere |first=Henry |title=A Primer of Flywheel Technology |url=http://www.distributedenergy.com/may-june-2007/primer-flywheel-technology.aspx |publisher=Distributed Energy |accessdate=2008-10-06 |archive-date=2009-03-11 |archive-url=https://web.archive.org/web/20090311014238/http://www.distributedenergy.com/may-june-2007/primer-flywheel-technology.aspx |url-status=dead }}</ref><ref name="Rosseta">[http://www.rosseta.de/texte/pdat-t4.pdf rosseta Technik GmbH, Flywheel Energy Storage Model T4], retrieved February 4, 2010.</ref>

:<math>E_\mathrm{rotirajoca} = \frac{1}{2} I \omega^2 </math>
kjer je
: <math> \omega \ </math> je [[kotna hitrost]] 
: <math> I \ </math> je vztrajnostni moment okoli rotaicjske osi
: <math> E \ </math> je [[kinetična energija]]

==Glej tudi==
*[[Shranjevanje energije s stisnjenim zrakom]]

==Sklici in reference==
{{sklici|1}}

==Zunanje povezave==
*[https://www.uaf.edu/files/acep/BoeingFlywheelOverview_06_20_2012.pdf Boeing Flywheel Energy Storage Technology]
*[http://www.edsenerji.com.tr/userfiles/files/Federal%20Alert.pdf Federal Technology Alert, Flywheel Energy Storage]
*[http://www.magnetal.se/GESS.pdf Magnetal Whitepaper for its Green Energy Storage System&nbsp;– GESS]
*[http://www.magnetal.se/MagnetalGyro.pdf Magnetal analysis on gyro forces induced by flywheel energy storage]

{{normativna kontrola}}
[[Kategorija:Energetika]]