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Un artículo interesante sobre el Prius.

Publicado: 16 Mar 2007 17:47
por M Bolaños
The Toyota Prius has become the flagship car for those in our society so environmentally conscious that they are willing to spend a premium to show the world how much they care. Unfortunately for them, their ultimate ‘green car’ is the source of some of the worst pollution in North America; it takes more combined energy per Prius to produce than a Hummer.

Before we delve into the seedy underworld of hybrids, you must first understand how a hybrid works. For this, we will use the most popular hybrid on the market, the Toyota Prius.

The Prius is powered by not one, but two engines: a standard 76 horsepower, 1.5-liter gas engine found in most cars today and a battery- powered engine that deals out 67 horsepower and a whooping 295ft/lbs of torque, below 2000 revolutions per minute. Essentially, the Toyota Synergy Drive system, as it is so called, propels the car from a dead stop to up to 30mph. This is where the largest percent of gas is consumed. As any physics major can tell you, it takes more energy to get an object moving than to keep it moving. The battery is recharged through the braking system, as well as when the gasoline engine takes over anywhere north of 30mph. It seems like a great energy efficient and environmentally sound car, right?

You would be right if you went by the old government EPA estimates, which netted the Prius an incredible 60 miles per gallon in the city and 51 miles per gallon on the highway. Unfortunately for Toyota, the government realized how unrealistic their EPA tests were, which consisted of highway speeds limited to 55mph and acceleration of only 3.3 mph per second. The new tests which affect all 2008 models give a much more realistic rating with highway speeds of 80mph and acceleration of 8mph per second. This has dropped the Prius’s EPA down by 25 percent to an average of 45mpg. This now puts the Toyota within spitting distance of cars like the Chevy Aveo, which costs less then half what the Prius costs.

However, if that was the only issue with the Prius, I wouldn’t be writing this article. It gets much worse.

Building a Toyota Prius causes more environmental damage than a Hummer that is on the road for three times longer than a Prius. As already noted, the Prius is partly driven by a battery which contains nickel. The nickel is mined and smelted at a plant in Sudbury, Ontario. This plant has caused so much environmental damage to the surrounding environment that NASA has used the ‘dead zone’ around the plant to test moon rovers. The area around the plant is devoid of any life for miles.

The plant is the source of all the nickel found in a Prius’ battery and Toyota purchases 1,000 tons annually. Dubbed the Superstack, the plague-factory has spread sulfur dioxide across northern Ontario, becoming every environmentalist’s nightmare.

“The acid rain around Sudbury was so bad it destroyed all the plants and the soil slid down off the hillside,” said Canadian Greenpeace energy-coordinator David Martin during an interview with Mail, a British-based newspaper.

All of this would be bad enough in and of itself; however, the journey to make a hybrid doesn’t end there. The nickel produced by this disastrous plant is shipped via massive container ship to the largest nickel refinery in Europe. From there, the nickel hops over to China to produce ‘nickel foam.’ From there, it goes to Japan. Finally, the completed batteries are shipped to the United States, finalizing the around-the-world trip required to produce a single Prius battery. Are these not sounding less and less like environmentally sound cars and more like a farce?

Wait, I haven’t even got to the best part yet.

When you pool together all the combined energy it takes to drive and build a Toyota Prius, the flagship car of energy fanatics, it takes almost 50 percent more energy than a Hummer - the Prius’s arch nemesis.

Through a study by CNW Marketing called “Dust to Dust,” the total combined energy is taken from all the electrical, fuel, transportation, materials (metal, plastic, etc) and hundreds of other factors over the expected lifetime of a vehicle. The Prius costs an average of $3.25 per mile driven over a lifetime of 100,000 miles - the expected lifespan of the Hybrid.

The Hummer, on the other hand, costs a more fiscal $1.95 per mile to put on the road over an expected lifetime of 300,000 miles. That means the Hummer will last three times longer than a Prius and use less combined energy doing it.

So, if you are really an environmentalist - ditch the Prius. Instead, buy one of the most economical cars available - a Toyota Scion xB. The Scion only costs a paltry $0.48 per mile to put on the road. If you are still obsessed over gas mileage - buy a Chevy Aveo and fix that lead foot.

One last fun fact for you: it takes five years to offset the premium price of a Prius. Meaning, you have to wait 60 months to save any money over a non-hybrid car because of lower gas expenses.

Link: http://clubs.ccsu.edu/recorder/edito...asp?NewsID=188
En resumen, un Hummer es energéticamente más eficiente con una vida util de 300.000 millas, que un Prius con una vida util de 100.000 millas ($1.95 por milla, comparado a $3.25 por milla). Esto sumado a que la mina de Niquel de donde sacan el material para las baterias del Prius ha destruido una zona en Ontario. Y tras de eso para producir la bateria se extrae el niquel en Canadá, se envía a Europa a procesar, a China a hacer "espuma de níquel", luego a Japón y finalmente al país de venta del carro. Vaya, eficiencia energética...

Publicado: 16 Mar 2007 18:01
por pmontero
Pucha Mauricio muy interesante, pero me gustaría saber dónde lo encontraste. Para mí eso es una confirmación adicional de que se debería estar apuntando a sustentar nuestras necesidades energéticas con recursos naturales RENOVABLES y no con petróleo o minas de minerales. Por energías renovables podemos mencionar la hidroeléctrica, eólica, el sol y biomasa vegetal. Algunas se pueden almacenar, el tema es que volvemos al asunto de las baterías. Los biocombustibles no son una quijotada, son una necesidad y dicho sea de paso pueden contribuir a un mayor desarrollo económico y social de países rezagados.

Publicado: 16 Mar 2007 18:26
por eddy
:o

Publicado: 16 Mar 2007 19:26
por M Bolaños
Pedro, ahi mismo al final del artículo puse el vínculo de la fuente, es algo que yo ya habia escuchado antes.

Ahora que alguien me responda esto, que se hace con las baterías de un Prius cuando dejen de funcionar? Aún más costos energéticos para reciclarlas, o como en el caso de CR, aún más contaminación por sacarla a la acera junto con las cascaras de las frutas, la caja de pizza y la brosa del cafe.... (es decir, simplemente botarla a la basura).

Y no solo los Prius, sino que el otro montón de modelos que utilicen baterías de níquel.

Publicado: 16 Mar 2007 20:31
por pmontero
Mirá vos no vi la fuente en la carrera de querer contestar al tema... lo lógico es que las empresas automotrices contemplen el reciclaje de la mayor proporción de los componentes que utilicen en la fabricación de sus modelos, pero el tema de las baterías es verdaderamente difícil. Un aspecto muy interesante que se aborda ahí y que no mucha gente toma en consideración es el costo energético, porque a final de cuentas si la energía utilizada para la producción, operación, y reciclaje de un determinado artefacto proviene de fuentes no renovables pues no se está haciendo mucho bien que digamos. Por eso yo insisto que hay que voltear las miradas hacia los recursos naturales renovables... Ojo que no son inagotables como cometían la atrocidad de enseñarnos en la escuela :!: