BMW's Next Generation EfficientDynamics Being Developed with NASA
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Comments (13)
Great innovation :) recapturing some more of that lost heat energy.
March 10, 2009 4:49 pm
I'm assuming for economy gains. I'm looking forward to this actually. Let's hope BMW doesn't lose their sporty edge though.
March 10, 2009 6:53 pm
Thinking on it more, I really like this development, it encourages putting in more powerful/larger engines for increased efficiency/power output.
March 10, 2009 9:27 pm
8 speed gearbox : faster acceleration,the gearbox will live longer,better in economie
March 11, 2009 6:29 am
The idea of making heat into usable electricity is smart! Working with NASA for the thermal effects are ingenious move. 8-speed automatic is a plus. Wow, Efficient Dynamic is getting a upgrade! Brillent! I look forward to the actual production model with the application of these leading edge techs. : ) Go BMW Go!
March 11, 2009 7:00 am
why it had to be BMW the one to work with NASA? why GM didn't started a similar cooperation? what was doing Rick Wagoner... cause it's too late for them to develop now cars like VOLT... all was wasted... their money, taxpayer's money, future, everything... they've lost the start with these new technologies and they did it since their EV car was scraped...
March 11, 2009 2:28 pm
about 33% of an engines chemical energy is lost as heat in the exhaust. Now if we say 33% is also lost in cooling, and the last third goes to the wheels. That would make the 200kW on a 400hp (300kW) engine about 66% efficient. I know nothing about how efficient that system is, but it seems doable. (that is of course making that much power at full throttle and peak power, which is rarely seen off the race track and even on the race track happens from 10-20% of the time).
March 11, 2009 3:04 pm
u got it wrong mate about 65-70% of chemical energy from fuel is lost as heat, (a diesel engine is around 35-40% efficient petrol 30%), so a 300KW car actually rejects around 600KW of energy as heat through the exhaust, and consideing exhaust gases travel at supersonic speeds through most of the exhaust, so it would be impossible capture all the heat from that exhaust gas, maybe another 30-40% of the heat can be tranfered to their TEG device and then u have to consider the efficency of that device (and also as u mentioned the car will rarely be at full pelt), so i hope u can see the reasoning behind my comment ;)
March 11, 2009 6:50 pm
half of an engines heat is lost through its cooling system and half through its exhaust. that being said, exhaust gas temperatures at the exhaust tips is drastically lower then the header exhaust, meaning most of the exhaust heat is lost through the exhaust pipe walls.
March 12, 2009 11:19 am









