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Interesting paper, and it suggests some other possibilities, including a Pneumatic/Combustion hybrid (i.e. using a compressed air "flywheel") which seems to hav
by podperson 14y ago
Interesting paper, and it suggests some other possibilities, including a Pneumatic/Combustion hybrid (i.e. using a compressed air "flywheel") which seems to have greater benefits than an Electric/Combustion hybrid (a tank of compressed air is lighter than batteries).
Perhaps Tata is experimenting with an electric/pneumatic hybrid (so electric, but compresses air when braking, and consumes it when accelerating). This might work, but doesn't help with infrastructure rollout.
- masklinn 14y ago> a tank of compressed air is lighter than batteries Joule for joule, it's not. The best compressed air tanks you'll find roughly reach lead/acid batteries in energy/weight (~100kJ/kg). Lithium-Ion batteries have 4 to 9 times the energy density.
- podperson 14y agoIndeed. Also the mechanism to capture compressed air when braking would be in addition to the electric motor, which is needed in any event, and can charge batteries when braking. So yeah, upon reflection, just a Bad Idea.