xxxxx - 29-5-2007 at 12:15
say there is a mountain road which is 300 miles long. there is a constant incline or decline of 3% essentially along the entire length of the road
meaning a total rise of 9 miles (50,000 feet) and a total descent of 9 miles (50,000 feet). given the current efficiency of regenerative braking
systems how much fuel could be saved on a conventional diesel truck weighing ten metric tons traveling along this road.
roamingnome - 29-5-2007 at 12:48
what are the types of regen braking systems..... thers science in that...
ive heard that NASA developed a compressed nitrogen system whereby a hydraulic piston could compress nitrogen. due to the high 90% efficiency, the
project was logicaly scraped.
your answer comes to only 37% however
tumadre - 29-5-2007 at 15:53
It is much higher than 37%
65% is achieved with lead acid batteries and 1910 technology,
(300 mile road, constant speed, 3% grade)
use lithium ion and add 5-6%
[85%*(85%*90%)]=65%
for lithium ion it's [85%*(85%*98%)]=71%
Slip Sliding Away
franklyn - 10-6-2007 at 15:52
Not to be a wise guy but , on what planet do you plan to do this ? Gravity will
very likely be less given that the highest point above sea level on earth is the
six mile summit of Everest in Tibet.
One interesting plan that somewhat coincides with this , is the proposed
trans oceanic submarine train. Think of the British French "Chunnel" only
across the Atlantic. The scheme calls for building a tube for a Maglev train
that will slope following the continental shelf and continue to descend
perhaps half a mile below the surface at the midway point. Gravity is all
that powers the frictionless slide through the vacuum of the tube and the
accumulated momentum carries it back up to the end with the merest
minimum input of energy.
tumadre - 10-6-2007 at 16:12
he was also wondering if it might be possible to cancellate gravity waves ...
sorry but one ridiculous post deserves another
franklyn - 10-6-2007 at 19:17
It's not riduculous , just not very promising.
Efficiency of conversion for storage additionally to the mechanical losses of just moving
will limit capture to not more than 1/3 of the total available. The drivetrain efficiency
and rolling resistence will reduce this yet again when applied to run back uphill, at most
you might expect to recover 10% enough to run 30 miles back up.
.
12AX7 - 11-6-2007 at 13:58
Cycloid, anyone?
But then, that has nothing to do with regenerative breaking, which is an electromechanical process typically (yeah, it could be done with a
transmission and flywheel, but who wants that waste of friction in their car?).
Tim
[Edited on 6-11-2007 by 12AX7]
franklyn - 15-8-2013 at 02:21
Good ideas bide their time
www.cnbc.com/id/100959733
.