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Re: Think this out please....
Posted by Reality (more from Reality) on Fri, 15 Jun 2012 09:33:13
In Reply to: Think this out please...., Mark from Toronto, Fri, 15 Jun 2012 08:54:56
Mining trucks use electric braking in order to save brake pads and rotors (those house sized brake parts are not cheap. LOL). Since they drive in the middle of nowhere and don't drive very fast, they have plenty braking distance to play with, unlike conventional civilian cars.

I'm not sure what "50% gain" you were referring to. Most of the fuel consumption in a car at high way speed is spent on battling friction (besides heat loss), not stored in the form of vehicle kinetic energy. Put into perspective, a 3300lb car driving at 60mph for one hour, consuming 2 gallons of fuel, the entire vehicle's kinetic energy at 60mph is equivalent to 0.003 gallon of gasoline, after consuming 2 gallons. As my earlier math showed, only about 13% of the vehicle's kinetic energy can be recovered and reused after going through the regenerative braking system. So that means 0.00039 gallon saved for each full 60-0 braking. You have to engage in 2500 full 60-0 brakes to save 1 gallon! How many gallons of fuel do you burn through before making the equivalent of 2500 60-0 full brakes?

The main advantage that electric hybridization brings to gas turbine is in the freedom to leave the turbine off when power demand is lo. Gas turbines are inefficient at low load, so the electric hybrid system enabling gas turbine to be off when idling or even at low load, helps gas turbine significantly in its competition against piston engines. Gas turbine advantage over piston engine is in power-to-weight ratio. Gas turbinc-electric might be a field where high power models actually might make sense. That has to be weighed against the mass of electric storage units.



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