Porous, spongelike medium for H2 storage

Started by Laconian, April 19, 2020, 12:07:43 PM

cawimmer430

Quote from: Laconian on April 25, 2020, 01:07:10 PM
The 40% and 47% numbers seem pretty far removed from where we're at today.



Keyword was "theoretically", and I'm probably off a bit. I just remember the figure 47% for a Diesel engine, again, in theory.

Oh well, gonna enjoy my ICE for as long as possible.
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Laconian

Quote from: cawimmer430 on April 25, 2020, 01:25:36 PM
Keyword was "theoretically", and I'm probably off a bit. I just remember the figure 47% for a Diesel engine, again, in theory.

Oh well, gonna enjoy my ICE for as long as possible.

Ditto for me and my 6MT Miata. I sold my G37 because I saw the future of automobiles is in too-fast barges; lightweight and manual-shifted cars are a truly endangered species.
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MrH

Efficiency without considering energy density or how intensive it is to get it to the vehicle is kind of meaningless.

If nuclear cars were invented tomorrow, but were only 30% efficient, but cost 3 cents to make, almost no energy required to make it, and produced unlimited range for vehicles and plenty of power, would we care at all what the efficiency is?
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Laconian

Mmm, smell the alpha emitters in the exhaust.
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MX793

Quote from: MrH on May 12, 2020, 02:15:04 PM
Efficiency without considering energy density or how intensive it is to get it to the vehicle is kind of meaningless.

If nuclear cars were invented tomorrow, but were only 30% efficient, but cost 3 cents to make, almost no energy required to make it, and produced unlimited range for vehicles and plenty of power, would we care at all what the efficiency is?

We might care if low efficiency meant a lot more radioactive waste.
Needs more Jiggawatts

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giant_mtb

Quote from: MrH on May 12, 2020, 02:15:04 PM
Efficiency without considering energy density or how intensive it is to get it to the vehicle is kind of meaningless.

If nuclear cars were invented tomorrow, but were only 30% efficient, but cost 3 cents to make, almost no energy required to make it, and produced unlimited range for vehicles and plenty of power, would we care at all what the efficiency is?

:wtf:

Soup DeVille

Quote from: Laconian on April 25, 2020, 01:09:42 PM
The Model 3's permanent magnet reluctance motors are apparently 97% efficient at converting energy into motion. So replace that "Engine Losses - 68-72% loss" with "3%". And the "parasitic losses" part would probably be at a similar number, albeit for cabin heaters and battery temp management.

Those numbers are thermodynamic efficiency numbers for how well the engine converts heat energy into mechanical energy. When it comes down to bow efficiently they propel a vehicle down the road, a lot more goes into that.

Running heaters, ac and fans and such can't really be considered losses in the same way as heat out the tail pipe, because they are doing something you want.
Maybe we need to start off small. I mean, they don't let you fuck the glumpers at Glumpees without a level 4 FuckPass, do they?

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Soup DeVille

Maybe we need to start off small. I mean, they don't let you fuck the glumpers at Glumpees without a level 4 FuckPass, do they?

1975 Honda CB750, 1986 Rebel Rascal (sailing dinghy), 2015 Mini Cooper, 2020 Winnebago 31H (E450), 2021 Toyota 4Runner, 2022 Lincoln Aviator

MX793

Quote from: Soup DeVille on May 13, 2020, 01:50:37 PM
Its called a hypothetical argument.

If trees could scream, would we be so cavalier in cutting them down?

We might, if they screamed all the time for no good reason.
Needs more Jiggawatts

2016 Ford Mustang GTPP / 2011 Toyota Rav4 Base AWD / 2014 Kawasaki Ninja 1000 ABS
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MrH

Quote from: Laconian on May 12, 2020, 02:58:09 PM
Mmm, smell the alpha emitters in the exhaust.

:lol:

Quote from: MX793 on May 12, 2020, 03:01:10 PM
We might care if low efficiency meant a lot more radioactive waste.

Yes, but efficiency by itself is meaningless number.
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Laconian

#70
Quote from: MrH on May 13, 2020, 02:33:18 PM
:lol:

Yes, but efficiency by itself is meaningless number.

If we're talking about hydrocarbon-based energy source, efficiency is important for understanding the carbon footprint. Assuming the engine is a typical configuration and not some 500hp AMG turbo four pot in an A-class monstrosity. :lol:
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MrH

Quote from: Laconian on May 13, 2020, 02:34:26 PM
If we're talking about hydrocarbon-based energy source, efficiency is important for understanding the carbon footprint.

But the benefit of electric cars is that they don't have to be hydrocarbon based?

But even if they are, the efficiency of the electric vehicle itself isn't important.  The total efficiency, from converting hydro carbons into electricity, transmitting that electricity, and then usage, needs to be considered.  Just looking at one step of that just seems like a meaningless number.
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2019 Acura RDX SH-AWD
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Previous: '02 Mazda Protege5, '08 Mazda Miata, '05 Toyota Tacoma, '09 Honda Element, '13 Subaru BRZ, '14 Hyundai Genesis R-Spec 5.0, '15 Toyota 4Runner SR5, '18 Honda Accord EX-L 2.0t, '01 Honda S2000, '20 Subaru Outback XT, '23 Chevy Bolt EUV

Laconian

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Soup DeVille

Quote from: Laconian on May 13, 2020, 02:34:26 PM
If we're talking about hydrocarbon-based energy source, efficiency is important for understanding the carbon footprint. Assuming the engine is a typical configuration and not some 500hp AMG turbo four pot in an A-class monstrosity. :lol:

This is true; and has little to do with efficiency. Large low speed diesels are more efficient than car engines; but are horrible when it comes to environmental damage.

The point he was making, as I took it, was that efficiency alone is a poor benchmark.
Maybe we need to start off small. I mean, they don't let you fuck the glumpers at Glumpees without a level 4 FuckPass, do they?

1975 Honda CB750, 1986 Rebel Rascal (sailing dinghy), 2015 Mini Cooper, 2020 Winnebago 31H (E450), 2021 Toyota 4Runner, 2022 Lincoln Aviator

Laconian

Efficiency alone, maybe, just like clock speed or core count are meaningless for CPUs. But generally you assume that a mass produced thing is going to be well-rounded and not suffer serious bottlenecks. So if you brag about your 16 core CPU, I'll assume that it's 64-bit and also clocked pretty high. There aren't many 16-core 1-bit CPUs out there. :lol:

(There are, however, 1024 cored 1-bit CPUs: https://en.wikipedia.org/wiki/Connection_Machine)
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CaminoRacer

Quote from: MrH on May 13, 2020, 02:42:33 PM
But even if they are, the efficiency of the electric vehicle itself isn't important.  The total efficiency, from converting hydro carbons into electricity, transmitting that electricity, and then usage, needs to be considered.  Just looking at one step of that just seems like a meaningless number.

Seems like most people in this thread have been looking at the whole system. :huh:
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