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Old 10-05-2016, 02:35 PM   #1 (permalink)
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Toyota Mirai 'rollin water'

Regularly see a rare Toyota Mirai on my commute to work, the lone favored driver using the HOV lane. This morning saw him merge onto the freeway from an entrance ramp, crossed in front of me and it quickly accelerated onto the HOV lane. As it took off saw a very noticeable and fascinating strong stream come out from underneath, most likely 'rollin water' vapor.


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Old 10-06-2016, 10:16 AM   #2 (permalink)
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Oh noes! Dihydrogen monoxide!
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Old 10-06-2016, 10:59 AM   #3 (permalink)
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The enviroquacks should jump on this ASAP. That thing is polluting the natural environment with it's man-made H2O.
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Old 10-06-2016, 11:18 AM   #4 (permalink)
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Old 10-06-2016, 11:43 AM   #5 (permalink)
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'That thing is polluting the natural environment with it's man-made H2O...

Oh noes! Dihydrogen monoxide!'

Saw what I saw...the hell?!

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Old 10-06-2016, 12:48 PM   #6 (permalink)
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All the waste and pollution happens before putting the hydrogen in the car.

Fuel cell cars are DOA. There are ~12-15 public hydrogen filling stations in the entire US. Most of those are in the Los Angeles area - and as many as half of those either run out of hydrogen altogether, or they can only pump 5,000PSI - HALF of what they are supposed to.

Some of those expensive filling stations can only service ~15 cars PER DAY.

Most of today's hydrogen comes from steam reforming natural gas - super-heated steam is used to split hydrogen out of natural gas. And the Mirai only gets ~60MPGe.

Fuel cells have a limited lifespan, and they are very heat intolerant. They waste ~50% of the energy as heat - and they have to stay under 100C - hence the giant cooling intakes.

These are electric cars with a small battery and hydrogen tanks with the fuel cell provide electricity - in a far less efficient way than a bigger battery.
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Old 10-06-2016, 01:43 PM   #7 (permalink)
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Quote:
Originally Posted by NeilBlanchard View Post
Fuel cell cars are DOA.
As long as you limit that to hydrogen fuel cells. It's perfectly possible to have fuel cells that run on other things, including biofuels such as sugar Sugar-powered biobattery has 10 times the energy storage of lithium: Your smartphone might soon run on enzymes | ExtremeTech or alcohol https://en.wikipedia.org/wiki/Direct-ethanol_fuel_cell
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Old 10-07-2016, 05:00 PM   #8 (permalink)
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Water vapor is a greenhouse gas.
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Old 10-07-2016, 11:55 PM   #9 (permalink)
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Quote:
Originally Posted by Xist View Post
Water vapor is a greenhouse gas.
But its concentration in the atmosphere is self-stabilizing, as long as temperatures remain constant. Unlike CO2, if you increase the amount of water vapor in a particular place, it precipitates out as rain or snow.

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