Comments by "Gabor Rajnai" (@gaborrajnai6213) on "DW Planet A" channel.

  1. The real problem is that green is up for virtue signalling. You cant show off your heatpump, but you can show off your electric car.
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  2. Its still misleading. if your town needs 1 GWh of electricity, then it needs exactly 1 GWh of electricity not one third of that, and regardless of what source it comes from. So no the demand wont change a bit.
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  3. There is actually a solution how to make fossil fuel comsumprion way more efficient. Those are the molten carbonate fuel cells which could produce electricity on a 90+% efficiency. Those arent utilizing the coal energy to boil something but get it out as electrochemical energy so the theoretical maximum is not the Carnot efficiency which is for heat engines, but the Gibbs efficiency for electrolytics. However the problem with molten carbonate fuel cells, is they require a constant 1000 celsius temperature to operate, which of course can be maintained with a good enough insulation, but a little bit problematic. The sole reason why they arent invested in is because those still use fossils albeit a lot less of them.
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  4. Nuclear sucks as well, its horribly expensive and slow to build.
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  5. Under very specific circumstances they are. Mostly I would say 30% efficiency is realistic. The Carnot efficiency is around 66% so there is no efficiency of a thermal engine beside that point.
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  6. Have you looked into how big of an area is used by the peatpumps to catch heat? The main problem wont be the electricity one, but rather if there are a multitude of heatpumps utilizing the same reservoir, they will start to drain the heat from eachother and become inefficient. This is especially problematic for a city since not all buildings would have a 3-4000 squaremeter designated space for their heatpumps. Sure it works up until the point where there is not a lot of them.
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  7. If you live on a ship then you simply sail to the good weather. The unfortunate practicality is harbor fees will take away any cost benefit.
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  8. Heavy lifting doesnt use diesel actually, thats because a clutch system designed for heavy lifting would be extremely complicated compared to a diesel electric systems. Sure diesel is burned but to produce electricity whic in order used by heavy machines.
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  9. Liquid metal and gas cooled reactors are pretty much prone for meltdown as well. @gregorymalchuk272 
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  10. Well, not entirely. The Carnot efficiency of a steam turbine is always less than 66%, you can do whatever you want you can turn the entire steam into water, you wont ever get a better performance out of a heat engine run by water, since thats the thermodynamic maximum. However it can be more efficient, if you utilize the hot water as domestic heating. the problem with that is the condenser operates around 50 celsius and 0.1 atm pressure, while the domestic heating requires 70 celsius and 1+ atm pressure so if you give it out as heating, then you lose energy which otherwise could be turned into electricity. And electricity pays a lot more than domestic heating.
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  11. Nuclear energy is actually the least efficient of them all. A lot of cogeneration and second boiling options are lost, since people dont want heatingwater from a nuclear powerplant.
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  12. Dear, you dont buy coal energy when you pay electricity bills, you buy 100% useful energy. If your bills say you need 1 GWh of electricity to feed your city, then you need 1GWh, not one third of that. Americans are doing their sales pitch as usual, but what they are talking about does not makes too much sense as usual.
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