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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Are electric cars more energy efficient?
I was thinking about electric cars today.
An internal combustion car, burns fuel inside cylinders and produces energy according to Carnot cycle. Say, it makes 28% of energy from the total BTU of fuel that it burns. Compare it with an electric car. A coal electric power station operates at efficiency of 33% (Wikipedia). Then 10% of this is lost in power distribution. More lost in stepping down line voltage to 220 volts. Further, more is lost in a battery charger. Then more is lost in the car battery. Then more heat is lost in motor windings and power semiconductors. This is probably by far less efficient than internal combustion an distribution of gasoline! And how is it going to reduce CO2 emissions, if more CO2 needs to be burned as coal than would come from gasoline? i |
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