• úvod
  • témata
  • události
  • tržiště
  • diskuze
  • nástěnka
  • přihlásit
    registrace
    ztracené heslo?
    TUHOKlimaticka zmena / Thank you so much for ruining my day
    TADEAS
    TADEAS --- ---
    SHEFIK: no zmenit se toho musi dost, aby vse co nyni pokrejva fksil pokrylonneco jinyho vD

    jinak celkem souhlas, ale problematika toho uloziste dulezita je. pokud chci hodne decentralizovanejch zdroju s ulozistema, precerpavani to nebude. stavet ty nadrze je drahy a to mnozstvi ukozeny energie pokud to neni obri projekt je ve srovnani treba s vodikem malinky.
    TADEAS
    TADEAS --- ---
    TADEAS, TADEAS:

    Storing wind and solar with new gravity-based system – pv magazine International
    https://www.pv-magazine.com/2020/05/11/storing-wind-and-solar-with-new-gravity-based-system/

    Gravitricity is due to begin construction of its £1 million pilot project in October.

    Scottish start-up Gravitricity has developed a gravity energy storage system it says is perfect for storing solar and wind power.

    A 16m-high rig uses the clean power to raise a mass in a 150-1500m shaft and discharges the electricity thus ‘stored’ by releasing the mass to rotate an electric generator.

    Gravitricity said the mass used can range from 500 to 5,000 tons and the electricity discharged could power 30,000 nearby homes for two hours.

    The start-up claimed sophisticated winches and a control system can lower the mass very quickly, making it flexible enough to stabilize electricity networks at 50Hz and ensuring the set-up can respond to full power demand in less than a second. “Our technology has the fast response time of lithium-ion batteries,” the company said
    TADEAS
    TADEAS --- ---
    First Electric Tankers Equipped with Lithium Ion Batteries | Electric Vehicles Research
    https://www.electricvehiclesresearch.com/...rst-electric-tankers-equipped-with-lithium-ion-batteries

    Asahi Tanker has decided to build two world first zero-emission electric propulsion tankers. The specifications of the vessel will use the "e5 tanker" planned and designed by e5 Lab which was jointly established the companies Exeno Yamamizu, MOL, Mitsubishi Corporation and Asahi Tanker and will be completed sequentially from March 2022 to March 2023

    The vessel is a pure battery tanker powered by large-capacity lithium-ion batteries is scheduled to enter Tokyo Bay as a marine fuel supply vessel. Completely electrifying the ship's core energy system will be a move towards achieving zero emissions of CO2 (carbon dioxide), NOx (nitrogen oxide), SOx (sulfur oxide), smoke, etc.
    TADEAS
    TADEAS --- ---
    Photosynthesis rewired to generate hydrogen | Research | Chemistry World
    https://www.chemistryworld.com/news/photosynthesis-rewired-to-generate-hydrogen/4011702.article

    Scientists have successfully directed photosynthetic electron flow away from fixing carbon dioxide and towards proton reduction by fusing together photosystem I (PSI) and algal hydrogenase in vivo. Modified algae cells expressing the PSI–hydrogenase chimera produce hydrogen in a light dependent fashion at high rates.


    ...

    Jenny Zhang, an expert in semi-artificial photosynthesis at the University of Cambridge, UK, says that identifying the site on photosystem I where redox enzymes can be fused is an exciting step forward. ‘This will no doubt form the foundation of future efforts to develop algal systems that can efficiently perform a range of solar-driven chemical formation processes, such as the conversion of carbon dioxide into useful feedstocks. The development of such breakthrough systems are still greatly needed in our repertoire of energy production and carbon dioxide recycling strategies.’

    ...

    We are now moving towards trying to find hydrogenase enzymes that are more oxygen-resistant,’ says Redding. ‘The hope is that by using directed evolution, we could force the algae cells to do all this in the presence of oxygen, so that in order to live, they would have to make hydrogen.’
    RADIQAL
    RADIQAL --- ---
    odkladam si to sem, recenzi dodám později:
    Fairytales of Growth (2020) Documentary
    https://www.youtube.com/watch?time_continue=5&v=dQ4cpOKmde8&feature=emb_logo
    RADIQAL
    RADIQAL --- ---
    TUHO: dost podobně i Monbiot:
    Planet of the Humans, whose executive producer and promoter is Michael Moore, has now been watched 6 million times on YouTube. The film does not deny climate science. But it promotes the discredited myths that deniers have used for years to justify their position. It claims that environmentalism is a self-seeking scam, doing immense harm to the living world while enriching a group of con artists. This has long been the most effective means by which denial – most of which has been funded by the fossil fuel industry – has been spread. Everyone hates a scammer.

    And yes, there are scammers. There are real issues and real conflicts to be explored in seeking to prevent the collapse of our life support systems. But they are handled so clumsily and incoherently by this film that watching it is like watching someone starting a drunken brawl over a spilled pint, then lamping his friends when they try to restrain him. It stumbles so blindly into toxic issues that Michael Moore, former champion of the underdog, unwittingly aligns himself with white supremacists and the extreme right.

    ... the film’s attacks on solar and wind power rely on a series of blatant falsehoods. It claims that, in producing electricity from renewables, “You use more fossil fuels to do this than you’re getting benefit from it. You would have been better off just burning fossil fuels in the first place”. This is flat wrong. On average, a solar panel generates 26 units of solar energy for every unit of fossil energy required to build and install it. For wind turbines the ratio is 44 to 1.

    But this is by no means the worst of it. The film offers only one concrete solution to our predicament: the most toxic of all possible answers. “We really have got to start dealing with the issue of population … without seeing some sort of major die off in population, there’s no turning back.”

    Yes, population growth does contribute to the pressures on the natural world. But while the global population is rising by 1% a year, consumption, until the pandemic, was rising at a steady 3%. High consumption is concentrated in countries where population growth is low. Where population growth is highest, consumption tends to be extremely low. Almost all the growth in numbers is in poor countries largely inhabited by black and brown people. When very rich people, such as Michael Moore and Jeff Gibbs, point to this issue without the necessary caveats, they are saying, in effect, “it’s not us consuming, it’s Them breeding.” It’s not hard to see why the alt-right loves this film.

    Population is where you go when you haven’t thought it through. Population is where you go when you don’t have the guts to face the structural, systemic causes of our predicament: inequality, oligarchic power, capitalism.


    Michael and Me – George Monbiot
    https://www.monbiot.com/2020/05/11/michael-and-me/
    DRSH
    DRSH --- ---
    The Independent: Změna klimatu je tu o dekády dřív. Současných vln horka a vlhka jsme si dřív nevšimli | Plus
    https://plus.rozhlas.cz/...ena-klimatu-je-tu-o-dekady-driv-soucasnych-vln-horka-a-vlhka-jsme-8200269
    DRSH
    DRSH --- ---
    Nové přehrady kvůli suchu? To je naprosto špatný koncept, zlobí se odborník Hruška | Plus
    https://plus.rozhlas.cz/...y-kvuli-suchu-je-naprosto-spatny-koncept-zlobi-se-odbornik-hruska-8200875
    TUHO
    TUHO --- ---
    Radek Kubala
    Sepsal jsem recenzi na film produkovaný Michelem Moorem Planeta lidí, kterej je lživej, manipulativní a občas se trefí do něčeho, co by i mohla být smysluplná kritika. Dělá to ale nepoctivě a hanebně.
    "Micheal Moore s Jeffem Gibbsem ve skutečnosti natočili dárek pro fosilní průmysl, který ho klidně může začít používat v rámci vlastní propagandy. Jediné věci, které se z něj dají odnést, jsou apatie, demotivace nebo touha po globálním holokaustu. A přesně takové nás chtějí kapitáni fosilního průmyslu mít. Zoufalé a šílené. Nedovolme jim to."

    https://denikreferendum.cz/...daroval-dokument-fosilnimu-prumyslu-jeho-planeta-lidi-lze-a-manipuluje
    SHINIGAMI
    SHINIGAMI --- ---
    TADEAS: jako jo, v hlinikovy kostce mas hodne energie , ale podivej se taky, jak se vyrabi. Tohle neni jako pretavit plechovky ale spis nova vyroba z cisty rudy.
    TADEAS
    TADEAS --- ---
    SHINIGAMI: oblibil neoblibil, na levelu random rozumbrada z internetu si ctu ruzny veci a (viz seasonal storage filtr) je to jedna z cest, ktera mi dava smysl -- hodne energie na objem, efektivni propojeni k vyrobe elektriny skrz fuel cells, moznost vysoky miry decentralizace, moznost prepravovat z oblasti kde ma fve/vitr lepsi eroi, seasonal storage, moznost jednoduse rozsirovat uloznou kapacitu. kdyz si predstavim reseni decentralizovany renewable energetiky, nejaka takovejhle flexibilni forma uloziste je klicova.
    DZODZO
    DZODZO --- ---
    SHEFIK: eroi ropy nam pomaly klesa, kedze nove naleziska su tazsie dostupne, dalej od existujucej infrastruktury, technologicky narocnejsie na ziskavanie, to uz sa potom ta jednotka ulozenej energie na m3 prestava vyplacat vzhladom na energiu spotrebovanu na jej ziskanie viz. napr. tu porovnanie Kanada rok 1970 vs 2010

    EROI of different fuels and the implications for society - ScienceDirect
    https://www.sciencedirect.com/science/article/pii/S0301421513003856
    SHINIGAMI
    SHINIGAMI --- ---
    Ze sis tak oblibil zrovna ten vodik (blbe se to uklada, mizerna ucinnost) a hlinik (komunista mel vysokou pec v kazdym meste, zelenej elektrolytickou pec na hlinik, atd... )
    SHEFIK
    SHEFIK --- ---
    TADEAS: ok, to je ale prave nekolik veci najednou a je potreba je oddelit

    1) do tematu eroei se nechci moc poustet, ale z podstaty veci jeji mereni se zaklada (a musi zakladat) na menicich se faktorech, jako ~ocekavana prumerna zivotnost, ~ocekavana prumerna efektivita, ~pravdepodobne (ne)ocekavana recyklace, jako vstup do dalsiho vyrobku/eroei. ~ocekavany prumerny energeticky vstup na vyrobu.

    vsechny tyhle faktory se meni v case k lepsimu a pokud je prumerujeme a delame vedecke prace, tak tam zahrnujeme co bylo / je. pochybuju, ze napr. eroei solarek pocita s tim, ze se zvysi skokove efektivita (vic muj link pred par dny) nebo po 20 letech prevezou do afriky, kde budou na pousti s nizsi efektivitou slouzit dalsich 20 let (velke procento z nich). dalsim prikladem muze byt pouziti dreva na vetrnik, pastoval jsem nedavno. oproti kovu bude eroei mozna nizsi (nevim), nebo se diky recyklaci po jejich zivotnosti pomuze usetrit energie jinde

    navic u ropy uhli apod uz se bude pocitat s castecne existujici infrastrukturou, oproti tomu infra pro renewables budujeme/objevujeme, takze se budou energeticky vstupy logicky snizovat. kdyz Ford budoval tovarny, tak taky nejezdily ropny tankery pres pulku sveta, to by tehdejsi eroei dostalo zabrat..

    2) presne tak, u fosilu spotrebovavame "baterky", takze eroei je vpodstate pokriveny, protoze nezapocitavame cas a tlak, ktery byl pro tuhle formu skladovani zapotrebi. navic spotrebovavame kvanta vody na ropnych piscich apod. a ziskavat cistou vodu bude stale vic a vic energeticky narocne

    3) nemusi jit jen o seasonal storage, tech typu je vic a musej fungovat jak na okamzity, tak na rocni bazi. a jakmile se vybuduje sdilena infrastruktura pro tyhle storage, nemusej se vypinat vetrniky pri prebytcich atd. eroei zase posune jinam.

    s densitou ale forma vyroby nema moc spolecnyho, to je jen prostorovej problem - napr. pro auta (nabijitelny ze silnice, vodiku, li-on...), ale uz vubec ne pro verejnou elektrickou sit, kde muzes mit precerpavaci elektrarnu.

    jeho tvrzeni "Those who believe that the world will function the same on lower energy density sources like wind and solar should review their old physics text books" je egoisticky a bud by si mel tu knizku precist znovu on, nebo vysvetlit co konkretne se ve svete zmeni. zas tolik toho byt nemusi

    Energy storage - Wikipedia
    https://en.wikipedia.org/wiki/Energy_storage
    TADEAS
    TADEAS --- ---
    SHEFIK: no, tak nepise to presne. z hlediska vyroby je tam to eroei, ktery potrebujem mit nad nejakou hodnotou. z hlediska spotreby se to brat tak, ze u fosilnich paliv vzdycky spotrebovavame z baterky, takze to srovnani cerpani z uloziste se spalovanim paliv nejakej smysl dava. kdyz si predstavim napr. nejaky mikroregionalni reseni energetiky, tak k vetrnymu parku muzu bez problemu prostorove mit seasonal storage ve vodiku nebo hliniku. oproti napr. vode, kde bych musel mit prehradu a naklady pravdepodobne mnohem vyssi (i pres delsi zivotnost).
    SHEFIK
    SHEFIK --- ---
    TADEAS: to sou prece jabka a hrusky. skladovani (resp. density skladovani) a vyroba (vs. jeji skalovatelnost). ta veta je dojem autora vystreleny od boku po nedelnim knedliku, nic moc k vedecke diskuzi
    TUHO
    TUHO --- ---
    TUHO
    TUHO --- ---
    Noam Chomsky, Janis Varoufakis, Srecko Horvath a dalsi spousteji platformu, jejiz jednim z cilu je prosadit mezinarodni Green New Deal

    Fossil fuel industries are driving us into climate catastrophe — and the world’s working class will be forced to pay for their greed. This toolkit helps you organize to fight for a just transition around the world.
    Our future has been held hostage by a handful of oil and gas executives. For decades, they have lied to the public about the dangers of fossil fuel extraction, and bought off politicians to repeat their message. They are internationally organized, infiltrating institutions at both national and international levels to advance their agenda of extraction. Their incredible wealth means their families will be fine, but the rest of us won’t.


    https://progressive.international/...ng-for-a-green-new-deal-7af9e89d-542f-44b1-816c-d79745459027/en
    SHINIGAMI
    SHINIGAMI --- ---
    Benzin - spalne teplo - 33.6GJ.m-3 = 9.3MWh.m-3
    TADEAS
    TADEAS --- ---
    ze smila, energy and civilization

    Kliknutím sem můžete změnit nastavení reklam