Cars, it's electric! Do Do Do

rick81721 said:
PS something is wrong with your calculations - think your tesla battery capacity is off by a factor of 10. Current FCEVs with 5kg H2 tanks have about the same range as a tesla.
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well 40*50 is 2,000, so minimally cut it in half.
now a factor of 5 - i'll have to look more.
it is a large weight reduction, but i'm not sure that is enough to explain it
from a range POV - since the calc was energy.
 
Patrick said:
well 40*50 is 2,000, so minimally cut it in half.
now a factor of 5 - i'll have to look more.
it is a large weight reduction, but i'm not sure that is enough to explain it
from a range POV - since the calc was energy.
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The problem is your tesla battery number - their ~ 1000 lb battery pack is 100 KwH, not 1000. If it was 1000 (at the same weight) , a Tesla would have a range of over 3000 miles on one charge!
 
See, this is all good discussion. I'm not anti-BEV, but I do believe BEV's a the car makers' solution. IMO it's not the right solution, or a good solution, just a stop-gap at best. I'm already tired of all these great batteries, and they haven't even started to pile up at recyclers.
 
shrpshtr325 said:
we already have systems available for dispensing pressurized gas (propane anyone?) should be easy enough to convert stations to something similar and then environmental hazard of leaks goes away . . .
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Propane is a liquid at that pressure - transports well.
H2 is never a liquid at any normal temp.
Delivering LP or LNG to the H2 generating plant makes sense tho.
(i think? pipelines work well as long as NIMBY)

going back to the 125l/5kg example from Rick -
Let's cut the battery pack by 75%, and cut the H2 "vessel" by 50% -
A 25% penalty in range without correcting for significant weight reduction.
62l is about 16gallons? the tank a little over 2 cuft would do it.
maybe 9" round, 4' tall + the wall of the tank, and ya can't run it to 0, so whatever that it.
hell, use two smaller tanks! wait, make the size of the tank holder variable!
Then just pick the right tank.

Where are my investors!
 
Patrick said:
Propane is a liquid at that pressure - transports well.
H2 is never a liquid at any normal temp.
Delivering LP or LNG to the H2 generating plant makes sense tho.
(i think? pipelines work well as long as NIMBY)

going back to the 125l/5kg example from Rick -
Let's cut the battery pack by 75%, and cut the H2 "vessel" by 50% -
A 25% penalty in range without correcting for significant weight reduction.
62l is about 16gallons? the tank a little over 2 cuft would do it.
maybe 9" round, 4' tall + the wall of the tank, and ya can't run it to 0, so whatever that it.
hell, use two smaller tanks! wait, make the size of the tank holder variable!
Then just pick the right tank.

Where are my investors!
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What are you trying to solve here? FCEVs already have two tanks - gotta be cylinders or spheres with those pressures - but cylinders make more sense:

hydrogen-high-res.jpg
 
rick81721 said:
What are you trying to solve here? FCEVs already have two tanks - gotta be cylinders or spheres with those pressures - but cylinders make more sense:

View attachment 172774
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More fun to figure it out.
i checked, and the tanks weigh about 80lbs.
so they should have the ability to add more and get rid of the back seat.
 
Is there a specific isotope of Hydrogen that a Hydrogen car is supposed to use? That may sway your calculations.
 
Patrick said:
engine heavier - fuel lighter
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But more fuel required for the same power plus additional weight of pressurized gas tanks. And what's the power output of an electric prop engine vs a turbofan? This will only work for short-range commuter flights.
 
rick81721 said:
But more fuel required for the same power plus additional weight of pressurized gas tanks. And what's the power output of an electric prop engine vs a turbofan? This will only work for short-range commuter flights.
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Energy problem

They aren't breaking the sounds barrier so large props work. They also have high torque so low RPM is Ok.

Probably could not store enough for long haul
 
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