Embedded Systems Conference
Breaking News
Newest First | Oldest First | Threaded View
User Rank
re: Silicon Valley Nation: EV design chain and pollution
POConsulting   10/10/2012 4:35:44 AM
PART 2 Today the U.S. consumes about 12 Mbbl/day of oil equivalent in natural gas. Thatís about the daily consumption of oil for ground transportation. So, the U.S. already consumes huge quantities of NG. Furthermore, NG is less polluting. It seems almost counterintuitive, but the CO2 emissions of a natural gas hybrid vehicle would be less than that of an equivalent EV. Of course, thatís a hypothetical NG hybrid (with gasoline ICE replaced by CNG ICE) since to my knowledge none is on the market. This hypothetical NG hybrid need only have the average hybrid efficiency to achieve lower CO2 emissions than an EV. CO2 emissions from such a vehicle would be 10% less than an equivalent EV with todayís electric generation mix of 45% coal and 24% NG. CO2 emissions of such a vehicle in China would be 60% less. A NG hybrid would be cheaper than an EV (MSRP for a Prius $24K, Volt $39k). A NG hybrid would overcome the two major objections to NG vehicles. The first is range, but with almost double the efficiency due to hybrid technology, range would nearly double, making range equivalent to todayís gasoline powered vehicles. The second issue is reduction in acceleration performance, but a hybrid uses the electric motor for acceleration, not the ICE. Exploiting NG for ground transportation has many advantages: increase in jobs in natural gas industry, vehicle industry jobs, improvement in balance of payments, velocity of money gains from energy dollars remaining in U.S. economy, energy independence, energy security, reduce entanglements in Middle East, improved national security, reduced emissions. Moving to NG for ground transportation will give us the 30 years or so needed to resolve the issues with electrified ground transportation. So, focus on the micro issues of CO2 emissions from EV manufacturing misses the big issues of energy and the economy. As engineers we need to find solutions that work.

User Rank
re: Silicon Valley Nation: EV design chain and pollution
POConsulting   10/10/2012 4:35:26 AM
PART 1 CO2 emissions is only one of many factors, the most important of which is economic factors. The EV does not pass the economic test. On the other hand, there is a need for a replacement of oil as a ground transportation fuel. Even moderate oil experts, such as Charlie Maxwell, see oil production straining its limits over the next decade followed by slow decline. An IMF model (The Future of Oil: Geology versus Technology) forecasts oil not going below $100/bbl after 2013 (average case, best case after 2016). $100/bbl translates to about $400B annual cost for oil imports. Improving petroleum-fueled vehicle efficiency is not the answer. Finding a substitute for oil is the pragmatic solution. The EV provides such a substitute, but it is too expensive. The best candidate substitute for oil at this time is natural gas, of which the US has an abundant supply, at a price half that of oil (this is likely a short-term affect due to excess NG supply).

User Rank
re: Silicon Valley Nation: EV design chain and pollution
FDunn3   10/10/2012 4:30:58 AM
And this report is just coming out now? It matters not, beause the electric vehicle is the vehicle of the near future until we can find a cleaner and more efficient method to propel vehicles. As far as the battery materials, they are and will be in short supply so they will be efficiently recycled. The motors that propel these cars also emit ozone, but in smaler quantities than a gasoline vehice. Finally, the utimate choice for the "front-end" (charging current not generated by the regen brakes) to charge te vehicles will be topic of heated debate for decades. Would you like to use Coal, natural gas, biowaste, or star bulding new Nuclea Plants?

User Rank
re: Silicon Valley Nation: EV design chain and pollution
tb1   10/9/2012 4:19:24 PM
Ah, RoHS. Lead in solder does not leach out into landfills, unlike lead in batteries. It is bound to the tin. On the other hand, requiring the use of non-lead solder means that we have to use higher temperatures during manufacturing (use more energy), use more heat resistant materials that can withstand these higher temperatures (using potentially more hazardous materials), and end up with more scrap (failures during manufacturing and reduced reliability due to increased heat of assembly and increased generation of tin-whiskers, even in the best of conditions). So I'm not so sure RoHS is a good example to use for 'design for environment'. It is more of a 'design by committee' (a committee of politicians in Europe who don't always look too deeply at the all the side-effects when coming up with their rules).

User Rank
re: Silicon Valley Nation: EV design chain and pollution
y_p_w   10/9/2012 1:24:52 AM
There's far more than simply the amount of CO2 produced. The issue with vehicle emissions is that they get dumped directly in populated areas. In addition to that, coal is being slowly phased out, and there are more sources for electricity than just coal and natural gas. In addition to that, it sounds as if the discussion of electricity use for aluminum production assumes that they're made from virgin aluminum from ore, which is very much electric intensive. However, I recall from elementary school that recycled aluminum uses only 5% of the electricity compared to the inputs required to separate the aluminum metal from the molten ore.

Most Recent Comments

Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight Ė as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.

Brought to you by

July 16, 1pm EDT Thursday
IoT Network Shoot Out
Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
LED lighting is an important feature in todayís and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptopís 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...