Comments by "Simon" (@Simon-dm8zv) on "Undecided with Matt Ferrell" channel.

  1.  @IrelandVonVicious  Building a lot of chargers once easily holds up against an intrinsically inefficient system. A hydrogen car is inefficient its entire lifetime. Unexpected empty batteries are a rarity as most owners will top up at night. Most drivers very rarely have to use rapid chargers for this reason and in most cases a short 10 - 15 minute charge will be plenty to get you home. Of course you are right regarding some very specific situations in which hydrogen might save you some time. But these downsides will soon not exist anymore due to the fast development of batteries and (rapid) chargers. By the time hydrogen cars (and the ecosystem) are ready for mass market adoptation it simply doesn't make sense anymore.
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  2. The best supercapacitors have a volumetric energy density of 88 Wh per liter. A 50 kWh car battery would therefore need 568 liters of supercapacitors.
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  3. Does that matter? NO
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  4. It uses carbon, but not more.
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  5. I read that using CO2 as a refrigerant is possible. But why isn't it used more often?
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  6.  @fritt_wastaken  Ok, so the overall efficiency of a system using CO2 is lower compared to other refrigerants?
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  7. Well the price of course totally depends on where you live etcetera, but CO2 emissions are lower when you use non renewable energy to power the heat pump compared to gas fired furnaces.
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  8. Heat pumps in the UK work just as great as anywhere else in the world with similar climates. Just because the news paper published a few articles about people that say that heat pumps are not that great does not mean that this is actually true. It all comes down to proper installation and insulation of the house (UK houses are really badly insulated due to cheap gas over the past decades).
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  9. No because heat pumps extract a large part of the produced heat from the environment. Even on fossil electricity total average CO2 emissions are therefore lower.
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  10. Lithium is not the problem. It is everywhere. Tesla just bought land in Nevada to extract it from sand. The problem with hydrogen is that is horribly inefficient so you meed loads of energy to make it. Energy that we simply do not have and will not have.
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  11. Than what?
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  12. Not really
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  13. It is possible, but not right now.
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  14. Guess where heat pumps have been popular for decades. Scandinavian countries.
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  15. Public chargers at parkings for overnight charging.
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  16. It has zero potential because burning hydrogen in a combustion engine is insanely inefficient.
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  17.  @gregor.potrebujes  1. Implying that mr. Lazar is a reliable source does not really add to your credibility. 2. Mileage doesn't say anything about the well to wheel efficiency of hydrogen. You need to know how much energy it took to create the hydrogen before you can say anything about efficiency.
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  18. gregor potrebujes Thanks
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  19. Exactly.
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  20. Exactly
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  21. Nope. Too complicated and batteries will soon be so cheap that nobody wants anything to do with hydrogen.
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  22. Common misconception. Hydrogen is and remains intrinsically inefficient and unnecessarily complex compared to battery electric.
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  23. Still a lot better than oil or hydrogen.
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  24. Does not make much sense. Diesel is relatively efficient. Hydrogen is not.
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  25. They are pretty good for daily energy fluctuations.
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  26. We first need to mine massive amounts to be able to retrieve enough by recycling. We are talking decades of mining here.
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  27. Nice renderings lol
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  28.  @radiocrash  Lithium is not polluting nor connected to unethical mining. You are probably referring to cobalt. It's a misunderstanding to think that fuel cell systems do not require any mining of 'rare' earth materials. Because they do. You cannot fix the efficiency problem by simply using insane amounts of nuclear energy. Nuclear energy is nor abundant nor free. There simply won't be a moment 'once that is cracked'. It's just physics. Batteries will always remain much more efficient and this is what counts. Efficiency means low emissions per kilometer, no matter the source of energy. Pretty much all road transportation will be battery powered. Electric trucks and busses do already exist and this is just the beginning. Hydrogen fuel cell vehicles will always remain a niche.
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  29.  @radiocrash  You need a lot of other materials for fuel cells and electrolysers like platinum. Mining is never completely harmless or invasive and you do not solve these problems when choosing for fuel cells. Again, fuel cells are horribly inefficient and will therefore slow down the energy transition. Efficiency is what counts to lower emissions as fast as possible. EV batteries are perfectly recyclable.
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  30. ​ @radiocrash  Exactly and that remains a very goog argument. The steps involved with the hydrogen ecosystem consisting of production (electrolysis), storage (compression) and conversion (in a fuel cell) can only be optimised, but never eliminated. The difference in efficiency between an EV and a fuel cell vehicle is about a factor of 3. This will never change considerably. For BMW it is just a side project and Toyota kind of missed the boat regarding EVs and tries to do something else with hydrogen. In the meantime Toyota has started planning for EV production, starting in China and then later for the rest of the world. BMW is also about to put fully electric vehicles on the market. Volkswagen has recently explained why they are focusing on fully electric vehicles in stead of hydrogen: https://www.volkswagenag.com/en/news/stories/2019/08/hydrogen-or-battery--that-is-the-question.html
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  31.  @radiocrash  Sure, but hydrogen is simply highly unlikely because it is so damn inefficient.
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  32.  @radiocrash  The article also admits it is not a viable option for passenger cars.
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  33.  @radiocrash  This will remain so. Fuel cell tech can never catch up with batteries due to laws of physics.
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  34. Exactly sir.
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  35. You forgot that the big advancements of batteries also include vastly improved charging times. Hydrogen is pointless already with current battery technology. Fuel cells don't grow on trees either by the way.
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  36. Hydrogen fuel cells in cars is a bad idea, hydrogen fuel cells in even smaller vehicles like scooters and bicycles is even worse. Just use batteries.
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  37. Current Model S has equal range as a Mirai. Hydrogen is over.
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  38. Up to the user.
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  39. The energy is extracted from the environment air.
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  40. bart h You can’t create energy out of nothing.
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  41. bart h Anything you stick out of the fuselage causes extra drag and thus requires more energy.
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  42. No dude. That is not the reason.
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  43. You cannot compare hydrogen production to charging efficiency. The total efficiency of a hydrogen car is only 30%. Not 70%. An EV is about 75% efficient.
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  44.  @kronosaurelius  Take a look at this: https://images.app.goo.gl/dGtSeJRf7ioPa7JP9
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  45. I don't hope so. Sweden has been a world leader of using heat pumps in homes - which is far more efficient than burning hydrogen.
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  46. Mandernach Luca The Tesla Semi doesn’t weigh a lot more than a conventional diesel truck in its class. Operating and maintenance costs are so much lower than diesel or H2 that the small difference in hauling capacity does not really matter.
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  47. Mandernach Luca Here is a nice estimation: https://www.teslarati.com/how-much-tesla-semi-truck-battery-pack-weigh/amp/ And again, range is not that important because truck drivers take breaks regularly.
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  48.  @honesty_-no9he  exactly
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  49. Interestingly, in Europe heat pumps are very popular in the (cold) Scandinavian countries.
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  50.  @Nabrab  That is not true. I would love to give battery and hydrogen equal changes in development. However, the hydrogen ecosystem is so hideously inefficient that precious renewable energy would be wasted to generate green hydrogen. This requires fossil power stations to compensate the wasted renewable energy and thus cause more CO2. A few companies in the Netherlands tried to receive governmental subsidies for the construction of large scale electrolyzers. Fortunately the Dutch government decided last week to decline the subsidies due to the aforementioned reason. As long as there is no abundance of renewable energy, there is no valid reason to build electrolyzers and are we better off using H2 from conventional steam reforming.
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