Energy Efficiency in
A Better Future
|On the left a plug in
hybrid electric car.
1. Plug in Vehicles
It is cheaper to buy electricity than gasoline per
kilowatt-hour delivered to the wheels. A Kwh of electricity costs
about 10 cents and the charging and discharging in lithium batteries is
about 75% efficient so one gets power to the wheels for about 13 cents
per kwh. Gasoline has about 30 kwh per gallon but even the Prius
internal combustion engine is only 30% efficient so one gets 9 kwh
per gallon to the wheels. At $3 per gallon this means gasoline
costs about 33 cents per kwh to the wheel. In other words you can
do 50 miles for $1.00 of electricity from a plug in source.
2. Efficient Gasoline Engines
Smaller engines are more efficient than larger ones, also new
Variable Cylinder Management (VCM) technology further enhances the
efficiency of engines by deactivating three of the engine’s six
cylinders in a V6 during cruising and deceleration with no impact to
3. Diesel Engines
Diesel engines, with computer
assisted injection, use less fuel. First the diesel engine is
not a throttled engine and has far better efficiency under low load than
a gasoline (Otto cycle) engine which is throttled under low load.
Second at full load the diesel engine is also more efficient as the
compression ratio is more suited to recover the work out of the fuel.
At full load a diesel is about 38% efficient and a gasoline engine is
about 29% efficient. Diesel has a much higher specific gravity
than gasoline hence there are more pounds per gallon and hence more BTUs
per gallon in diesel than in gasoline. Energy is also wasted
creaking oil down to lower length carbon chains.
4-stroke explained in more detail?
4. Duel Fuel
Imagine a car that handles like a BMW and does 80mpg. For
5. Regenerative Braking
The energy that an automobile has when moving should not go
to heating the breaking system, it should be stored and used again.
6. Lightweight materials
The less weight the vehicle is moving around the lower will
be the fuel consumption.
7. Capturing Heat from the exhaust
Work is under way in the UK at present to develop systems to
utilize this energy.
8. Aerodynamic Shape
Regardless of what power source a car is using, the less its
aerodynamic drag, the less energy will be needed to travel at any given
speed. The best shape is known as the tear drop shape... Read
tweel is a new wheel developed by Michelin that does not need air tires.
The wheel has urethane spokes that bend and return to their round shape.
The tire is simply a tread on the surface of the tweel and it can get
retreaded over and over.
Examples that incorporate
some of these ideas: Toyota
None of the advocates of hydrogen as a fuel have done their
homework. This is not an opinion. The basic laws of Physics
are against it.
The main Achilles Heal of hydrogen as a fuel is storage in the vehicle.