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Old 01-22-2020, 01:55 PM   #1 (permalink)
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Full Spectrum Sun Energy Capture. But hydrogen sucks...

Interesting, they managed to capture energy from the entire spectrum of sun light.
And it have better efficience in the case of ver low solar incidense.

https://news.osu.edu/chemistry-findi...ore-efficient/

But hydrogen??? Hell... Hydrogen sucks...

1-Comressed hydrogen leaks, since the hydrogen atoms are too small and pass through metal containers.

2-To turn hydrogen liquid you spent the equivalent to about 50% of the energy the same amount of hydrogen could deliver.

3-Hydrogen it's not very efficient to be transformed back in energy. Burn it's almost bad as a engine car in terms of efficience. And fuel cells are not a practical reality yet and also not much efficient (around 50%).

So you have to energy problem to transport hydrogen, as it leak from comrpessed tanks, the absurd of 50% of equivalente energy needed to use it as liquid, and you also have low efficience ways of use,

It's better to keep photovoltaic solar cells as energy into electricity, instead of it to skip to hydrogen.


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Old 01-22-2020, 01:58 PM   #2 (permalink)
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That's the nature of energy conversions; losses.

This is why concentrated solar is more efficient than PV. Since light easily converts to heat, it makes sense to generate electricity from heat so that a larger percentage of sunlight is utilized. No chemical reactions take place (as far as I know).
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Old 01-22-2020, 02:14 PM   #3 (permalink)
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Triky quote :

"This new molecule collects energy from the entire visible spectrum, and can harness more than 50% more solar energy than current solar cells can."

What comparison is this??? Is it 50% more than what? What kind of photovoltaic cell are they comparing? There are many different kinds on hopmes, on satelite, on solar concentrators...

Redpoint, tell me how hydrogen can be used, if it have the dowsides I posted.
WIth 50% of loss (turn to liquid) x the 50% of loss (fuel cell efficience), we get just 25% of the energy from the hydrogen potential when it was produced.
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Old 01-22-2020, 02:24 PM   #4 (permalink)
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I can't remember a time where I was an advocate for hydrogen as a store for energy. Perhaps I was interested in my teens, but since then haven't given it any thought. I also briefly had excitement for corn ethanol before I knew any better.
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Old 01-22-2020, 05:38 PM   #5 (permalink)
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My mis-understanding is that if you compress hydrogen until it's metallic you can release the pressure and let it sublimate.
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This new molecule collects energy from the entire visible spectrum...
Would this be the spectrum in space or at the bottom of all the air and water?...and that problematic combination of the two — clouds.
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Old 01-22-2020, 06:33 PM   #6 (permalink)
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When I was almost Kid studying physics, I imagine it was possible to compress some gas (maybe hydrogen) until it became liquid, and if the container could be super ultra strong, it would keep it cold forever if the container would keep holding, and be used as a refrigerator or so. I was imagining the heat would be converted to presure to the tank and then with time dissipated.

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My mis-understanding is that if you compress hydrogen until it's metallic you can release the pressure and let it sublimate.

Would this be the spectrum in space or at the bottom of all the air and water?...and that problematic combination of the two clouds.
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Old 01-22-2020, 08:26 PM   #7 (permalink)
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Yeah Hydrogen still sux.

You only get 50% hydrogen efficiency if...
1 you run your fuel cell at "low load"
2 you run oxygen to your fuel cell.
3 in practice burning air as the oxidizer and running them at moderate load they get around 30% to 35% efficiency.
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Old 01-23-2020, 01:38 AM   #8 (permalink)
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Hydrogen embrittlement also known as hydrogen assisted cracking and hydrogen-induced cracking, describes the embrittling of metal after being exposed to hydrogen. It is a complex process that is not completely understood...
https://en.wikipedia.org/wiki/Hydrogen_embrittlement
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Old 01-23-2020, 07:55 AM   #9 (permalink)
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The Nelson curves may not be accurate.
As systems have been designed to be built outside of the Nelson curve have cracked and blown up.
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Old 01-23-2020, 08:37 AM   #10 (permalink)
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Interesting... So it's worse than I imagined.
Hydrogen not just it's capable of leak due manage go around the other molecules, since H2 it's a very smaller molecule, but it also can f...ck with metal container itself.

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