Originally Posted By: Shannow
42% is the power station before in house consumption, transmission and storage...it's really really good.
Err, no:
40% is what a coal fired power plant can achieve.
45% is what a big ship diesel engine can achieve (#2 fuel oil)
50% is what a peaking big diesel can achieve (60MW size piston engine).
60% is what a nat-gas turbine with auxiliary steam plant can achieve.
TODAY.
70% is what a hydrogen turbine is supposed to be able to achieve in a few years.
where % = energy delivered / energy in fuel
Originally Posted By: Blueskies123
The engine might some day 42% efficient but then you lose power thru the transmission, differential, wind resistance, and tires. I do not know if it is true but I read somewhere that if you are driving at 60 mph less than 10% if the energy is propelling the car.
My S600 takes only about 6HP to cruise a flat level straight road at 60 MPH.
My wife's Prius only about 4 HP.
That includes air resistance, tire resistance, ...
Originally Posted By: MotoTribologist
Assuming Shannow's 42% value is correct and factoring in the average electric losses of 7.4% in Florida, your electric vehicle has a starting efficiency of about 35% without factoring heat loss in the engine.
Shanon was not giving a good set of thermal efficiency numbers (above).
There have been rumors that the latest F1 engines are operating near 50% thermal efficiency (today!)
42% is the power station before in house consumption, transmission and storage...it's really really good.
Err, no:
40% is what a coal fired power plant can achieve.
45% is what a big ship diesel engine can achieve (#2 fuel oil)
50% is what a peaking big diesel can achieve (60MW size piston engine).
60% is what a nat-gas turbine with auxiliary steam plant can achieve.
TODAY.
70% is what a hydrogen turbine is supposed to be able to achieve in a few years.
where % = energy delivered / energy in fuel
Originally Posted By: Blueskies123
The engine might some day 42% efficient but then you lose power thru the transmission, differential, wind resistance, and tires. I do not know if it is true but I read somewhere that if you are driving at 60 mph less than 10% if the energy is propelling the car.
My S600 takes only about 6HP to cruise a flat level straight road at 60 MPH.
My wife's Prius only about 4 HP.
That includes air resistance, tire resistance, ...
Originally Posted By: MotoTribologist
Assuming Shannow's 42% value is correct and factoring in the average electric losses of 7.4% in Florida, your electric vehicle has a starting efficiency of about 35% without factoring heat loss in the engine.
Shanon was not giving a good set of thermal efficiency numbers (above).
There have been rumors that the latest F1 engines are operating near 50% thermal efficiency (today!)