Honda just dropped a bit of a bombshell on the world with its announcement that their heat-harnessing hybrids recapture more lost energy than even Toyota's hybrid drive during highway driving. This is fantastic news, since about half of American passenger vehicle driving happens at 65 MPH or faster, and mileage at those speeds has been almost completely unaffected by hybrid engines thus far.
The project uses Rankine cycle engine to capture waste heat from the car's exhaust and turn it into work. The system is fairly simple, though the thermodynamics are not. Basically water is heated, converted to steam, and the steam's expansion is used to turn a generator. Of course, that's a very basic explanation. For a more technical analysis, Green Car Congress always has the scoop.
The system was installed in a hybridized Honda Stream (only available in Japan). It is currently about 13% efficient and generates 3 times as much energy as a regenerative braking system in the EPA highway cycle. While highway mileages have been largely unaffected by regenerative braking, heat capture could assist in mileage increases in both highway and city driving.
Honda has decided that, at current efficiencies (and gas prices), it will not be cost-effective to include heat-capturing devices in production cars. Similar projects have come to the same conclusion. But with rising energy costs, and better engine designs, this could be a huge possible source of energy as more than 30% of a fuel's energy is immediately lost as heat in an internal combustion engine.
It's a promising new frontier, one with applications beyond vehicles everywhere from large-scale power generation to microprocessor cooling. Way to go, Honda.

written by James Staunton, February 18, 2008
written by Al Fin, February 18, 2008
written by Carl Foner, February 18, 2008
Does anyone know of projects using this or other technology that aim to recapture wasted heat energy in computers?
written by RhapsodyInGlue, February 18, 2008
Engineers and scientists have been trying to invent ever cheaper, more efficient heat engines to utilize lower temperature heat for nearly 200 years... but don't expect the concept of "waste" heat to go away anytime soon.
written by geo, February 18, 2008
steam engines can use any fuel and can recapture as much of the heat as you want to build expansion chambers for.
written by Andy Stannard, February 19, 2008
written by Thomas, February 19, 2008
Sure.. electric motor.. where is it going to get its power from? Sorry, petrol is still the most effective energy source for cars.
written by ad, February 19, 2008
Uh... from the power company? They're pretty good at it, or so I've heard.
written by Greasemonkey, February 19, 2008
http://schou.dk/hvce/
Ive seen one first hand and had the pleasure of working for the yaunick family after his death and had it explained to me in Smokey's Garage.
written by Electric, February 19, 2008
written by Shane, February 19, 2008
I think you made Thomas' point. The power companies get their power from petrol -- Generally speaking.
And many of the coal burning plants produce more (and worse) pollution than cars burning gasoline.
written by Stephen, February 19, 2008
http://en.wikipedia.org/wiki/Peltier_effect#Peltier_effect
written by EcoExpert, February 19, 2008
2) Honda is wasting money and time as are all car makers. On the surface it makes little or no sense. But once you dig and think it does... two reasons - One, big oil dominates, and Two, existing car companies are deeply invested in combustion engines and the civil infrastructure to support anything else doesn't exist.
3) Electric cars are NOT the answer!!! At least not if hydrocarbon fueled power plants are the source of the power. You are just shifting, not fixing the problem.
As an aside... if the folks saying it's simplier to clean up coal plants and the mini-eco disasters that feed them (mines) knew the truth they simply would STFU. In monetary terms alone it is a no-go... too dirty and the recapture tech long term is too costly (you still have to dispose and store/recycle the materials and infrastructure to clean the emissions of the plants, and that still doesnt' solve the huge ecological disasters that are coal mines in all forms).
4) Anyone saying that better emmissions controls coupled to flex or bio-fuel for internal combustion is the answer is an idiot. Proper bio-mass fuel sources are not going to be implimented in light of this nations catch 22 policy of proping up midwest and plain state farmers... never going to happen, and as anyone who can read and understand a few basic concepts knows, ethanol from corn and bean crops is a massive FAILURE... it costs more to produce the fuel than extracting and refining oil dos today (With a higher production carbon balance, if one wishes to use that terminology), the watershed damage for an increased demand for these crops will be devastating from Nebraska to the Yucatan and across the breadth of the carribean past Cuba.
Simply put, you need a better solution and a tiered plan that doesn't terribly disrupt the status quo while forcing change and conversion. That means steep investment in technology... solar, wind, tidal, thermal, and nuclear/fusion, removal of oil company subsidies and crusing short term laws to up fuel economy beyond what is possible in terms of affordability, investments and credits to companies who support short and long term green tech innovation, investment in power infrastructure (10% of generated power is currently lost due to inneficiencies!!!! And that doesn't even cover the fragility and growing lack of capacity of the system we have), investment in alt fuel delivery infrastructure (after settling on one or two power methods for vehicles), increase short term expansion of fission plants and commit heavily to both alt green power systems as well as long term fission deployment as augmentation and replacement for nuke plants long term.
written by Roger, February 19, 2008
written by Aaron W, February 19, 2008
2) Not necessarily. Granted the Rankine engine has been around a while, and will likely have a much longer infancy than the internal combustion engine...but it is still a promising concept. With some key advances, it may prove to help the efficiency of larger engines in colder environments. I would think Trains or Semi's would support the technology best, but that's a whole separate conversation.
In addition, cynical attitudes towards new prototypes aren't helping anything get done.
3) You forgot to mention battery disposal.
4) 1st paragraph) mostly agree. Switchgrass sounds promising, both from yeild and minimal environmental impact...but as you mentioned, Government subsidies to corn farmers will be tough to dance around. Who knows maybe it can spawn a fledgling industry.
2nd paragraph) This is pretty far off topic from Rankine engines but I agree with you. Unfortunately, the only way to influence the status quo is to make the more efficient alternatives more financially appealing.
-Aaron
written by Chris Taylor Jr, February 19, 2008
Think about that for a while.....
Gasoline is one of the LEAST efficient means of propelling a car. Does not even come CLOSE to the efficiency of an electric motor and battery pack. Not even close.
EV is 6 times more efficient than gasoline right out of the gate and this ignores the ZERO power usage when coasting and stopped and ignores anything such as regenerative braking etc..
Second EV would do NO harm to the Grid and in fact done right would dramatically improve grid performance.
Third even if all power is coal its a minimum 6 times more efficient meaning 1/6th the amount of pollution ignores all other things that make this EVEN LOWER or even ZERO.
Once Nano Solar is selling to the public a $1600 grid Tie in and a $500 solar panel on your roof will generate and sell enough power back to the Utility company to MORE than 100% offset ALL the power you would use charging your Electric Car meaning it would cost you NOTHING to drive that car. Not one cent.
This would also make the car 100 pollution free no matter what your power source was sine your OFFSETTING more than 100% of it with solar produced power.
NEXT even if you SKIP the solar for a normal performance sedan style car it would cost you around $1 per 100 miles driven to power your electric car. Your Gasoline Powered car would need to get 300 miles to the gallon to equal this.
AND it would outperform any comparable gas powered car in all categories.
You complain that it would take you 8 hours to recharge your car at home. Well even if I gave you a LIFETIME you could not refuel your GAS CAR at home now could you ? Did not think so.
At the "pump" with an electric car the recharge time would be LESS than 10 minutes.
THE ONLY reason you do not have an electric car option RIGHT NOW is because GM sold you out. They owned Ovonics the michigan company that made the NIMH Large Format batteries that make EV's PRACTICAL and AFFORDABLE
They sold this to Texaco who was bought by Chevron. ECD and Ebasys now have this battery patent. Chevron owns 50% of ECD and 20% of Ebasys and they have VETO privilege on ANY licensing deal.
IE they REFUSE to license the batteries for EV use or any use where a retrofit EV usage is possible.
This patent does not expire till 2015 and its a CONTROLLING patent meaning it covers enough points that no one can make a similar battery without violating the patent.
Since they people have been trying to "work around" the patent with NEW battery tech but without the 0's of millions of R&D dollars that an auto maker has its SLOW tedious lack of progress work.
Tesla had to GLUDGE together together technology to make the Roadster. You want to know why that car costs 100 grand ? thats easy This number explains it. 6,831
6,831 THATS how many stinking batteries they had to shove inside that car to make it work IE they had to WORK WITH consumer available tech because the tech that WORKS in an EV ie the Chevron NIMH's can not LEGALLY be used.
99% of my driving EVERY YEAR entails less than 110 miles of driving PER DAY. an EV with a 70mile range would suit me JUST FINE. my commute is 54 miles each way and I can recharge at work.
Are you telling me that spending less than 10k for a "second" car that goes 100miles a day for $1 (if you don't put up the solar then its FREE) and would cover you for 90 % of your yearly driving and almost NEVER break down and it would OUTLAST YOU is a problem with you ? Are you kidding? I would save $3,000 a year MINIMUM instantly just by going with an electric car if it was not for that god damned patent. Probably MORE since with driving now costing me NOTHING I would drive a lot more.
written by Chris Taylor Jr, February 19, 2008
Irrelevant. First the proper batteries for an EV OUTLAST the gas engine in most peoples cars. Some of the original Rav4 EV's that use these nimh batteries are now in excess of 150,000 miles with ZERO degradation so far in the batteries.
SO already even if we just THROW the batteries in a landfill when they die we are already polluting LESS than gas cars are now (all that oil tranny fluid power steering fluid anti freeze over the life of the car and then disposal of the engine etc..)
AN EV would be virtually everlasting and virtually maintenance free. This is precisely why GM killed the project with the EV1 since 54% of there profit which comes from AFTER sales parts and labor would go POOF overnight if they started cranking out EV's
Also Lead Acid batteries are a good example of what would happen with EV batteries. DO YOU KNOW what the recycle rate of Leads are ? its the single most successful recycling project EVER in the history of mankind. 98% are recycled.
So "3) You forgot to mention battery disposal. " does not concern me one little bit :-)
written by Chris Taylor Jr, February 19, 2008
This just shows how LITTLE you understand Electric Car Technology.
If 100% of our power plants were COAL plants switching 100% to electric cars would INSTANTLY reduce our pollution to 1/6th or LESS than what it is RIGHT NOW. It would also completely eliminate "smog" out cities would be immensely cleaner inside of 1 week (if it were possible to switch all at once that is)
NOW factor in the new affordable Solar Panels coming out and Grid Tie ins and Electric cars can not be 100% pollution free for $2100 a pop ($1600 for the grid tie in and $500 in solar panels which would produce more power each month than your electric car would use each month if you drive more adjust the size of the panel I personally would need an $1100 panel most people 80% would only need a $400-$500 panel.)
This increase in efficiency also IGNORES the fact that an EV uses NO power while not moving and NO power why decelerating and it ignores Regenerative Braking.
NOW how much ELECTRICITY do you think is used in the extraction refining processing piping trucking and pumping of each gallon of gasoline into your car? all that goes POOF. I would bet a months salary that the Electricity use to go 100 miles in an electric car is LESS THAN the electricity use to get 5 gallons of gasoline from the ground to your gas tank. (5 gallons average US MPG 20mpg so 5 gallons to go 100 miles)
Hell I would bet its even less than 3 gallons E usage if you has a 35mpg car. I even think there is 50/50 odds that its LESS E than is required to put 2 gallons into a Prius.
SO in the end switching to EV's would not only reduce pollution to 1/6th the amount instantly but would ALSO ON TOP OF THAT eliminate most of the pollution from E generation that goes into getting those gallons of fuel into your car.
And this is IGNORING the SOLAR offset I mentioned above!!!
Besides RANGE for smaller vehicles there is ABSOLUTELY no other downside to an EV !!! and the RANGE problem would be solved pretty damned fast once we started the switch to EV's and had 100's of millions of R&D pouring into it.!!!
For Larger vehicles range is a non issue. you just use MORE batteries!! Just like you have 10 15 20 and 35 gallon fuel tanks you would just use MORE BATTERY PACKS for whatever range you required.
Before you say well batteries are heavy. Well GASOLINE is heavier than ANY battery tech except LEAD acid which is nearly useless for EV's anyway.
Gasoline is what 6.2 pounds a gallon? so my 35 gallon tank in my van masses out at 217 pounds plus the mass of the tank. How heavy do you think NIMH and LITH batteries are? Plus your REMOVING a lot of mass. No more engine no more other stuff on the engine no more transmission for most vehicles (the EV motors are now good enough for direct drive to the drive shaft)
My jeep motor weighs at least 500 pounds. so by removing that I instantly remove over 700 pounds from the vehicle. The E motor weighs less than 100 pounds.
So I have 600 pounds capacity for batteries before I even EQUAL its current curb mass and this ignores the easily 150 pounds of the tranny so I have 700-800 pounds of capacity for batteries and MORE than enough space to install them WITHOUT intruding into the passenger compartment.
Electric Cars are DEFINATELY the answer. I also understand why GM Chevron and others want to ERASE electric cars. I mean if 54% of your profit as an automaker went POOF overnight and your $100 a barrel oil became nearly worthless overnight I guess I would also have a vested interest in CRUSHING the technology.
They produce the propaganda that caused YOU to think Electric is NOT the answer so that YOU (as in average joe) would not rightly DEMAND electric cars.
THATS why it was not enough for GM to stop making the EV1 They sent them to crushing yards with a GM rep in each truck to visually INSURE every single one of them was CRUSHED.
Something to think about is all.....
written by catbeller, February 19, 2008
written by David, February 20, 2008
I would think that a steam engine could be powered by pellets. The PLC/sensor controls available today would bring the safety concerns in line. Of course the actual power delivery to the wheels would be electric.
written by Chris Taylor Jr, February 20, 2008
I see a MASS creation of jobs as expenses across the board PLUMMET due to no more gasoline needing to be purchased.
I see a day deciding to drive somewhere has NO monetary cost associated with it and NO environmental cost associated.
Renewed freedom and prosperity in America. YES all that JUST from switching to Electric cars.
The elimination of smog and dirty snow and rain. There nice side benefits that one day we will go HEY look at that the air is clean the snow is white and the rain does not kill the plants anymore. Huh whoda thunk :-)
written by Spindog, February 20, 2008
written by wayneski, February 20, 2008
230 million autos X 3 = 690 MILLION OIL CHANGES A YEAR
6 million cycles x 3 = 18 million oil changes a year
what of the cost of trucking all that oil/gasoline????? Logistically, we can eliminate A LOT of the oil transport and container infrastructure.
Fluid changes are a valid argument. EV dont need Jiffy Lube changes every 6,000 miles.
and hey why stop there? put the EV's on electric rail and get rid of
1)traffic signals and signs
2)traffic courts and cops
3)auto insurance
LET EVOLUTION COME TO THE AUTOMOBILE!!!!!!!
written by Aaron W, February 20, 2008
No, I'm an electromechanical engineer...I'm pretty sure I have this one down. It shows we are missing something regarding coal power plants... please site something.
"If 100% of our power plants were COAL plants switching 100% to electric cars would INSTANTLY reduce our pollution to 1/6th or LESS than what it is RIGHT NOW. It would also completely eliminate "smog" out cities would be immensely cleaner inside of 1 week (if it were possible to switch all at once that is)"
Where are you pulling this 1/6 the pollution statistic from? I'll gladly take a "Pwned" label if coal power plants have managed something drastic, but even assuming perfect combustion... they still need to produce a significant percentage of the original power supplied by gasoline engines. This combustion is
Having seen the Vectrix scooter project -from inside a major partner company- nearly from inception to release, there are still some sizable hurdles to overcome before electric vehicles can replace internal combustion engines (such as battery cost and efficiency). The price alone will discourage many buyers.
"Electric Cars are DEFINATELY the answer. I also understand why GM Chevron and others want to ERASE electric cars. I mean if 54% of your profit as an automaker went POOF overnight and your $100 a barrel oil became nearly worthless overnight I guess I would also have a vested interest in CRUSHING the technology."
See also: Chevy Volt. I think GM would disagree.
-Aaron
written by Al B. Sure, February 20, 2008
written by Comparison Shop Event Tickets, February 20, 2008
written by Jeff Theobald, February 20, 2008
written by Jim, February 20, 2008
http://www.wiinjamod.com
written by Jake, February 20, 2008
written by MrsMagoo, February 21, 2008
written by Modern Polymath, February 21, 2008
I'm still surprised car companies aren't utilizing Stirling Engines.
written by fox, February 23, 2008
written by Dan Leithauser, February 24, 2008
I am not going to jump into the electric car life cycle analysis--how much energy goes in, where does it come from, what happens after the batteries die...what I do want to present since above posters have not, is the following:
If battery technology progressed a bit, presenting a continuing progress towards lighter, stronger, smaller, quick charging though thousands of cycles before recycling (which must take place).... maybe battery packs powering electric vehicles could be QUICKLY REMOVABLE and replaced. Then, instead of waiting for your batteries to charge---you run to the gas station. Your gas station visit would be an exchange of "your" batteries for a charged set of batteries.
The advantages to this approach are obvious. The "gas station" could still sell gas during any transition to more electric vehicles. The "gas station", as a currently regulated location (large gas tanks underground means they are regulated), the storage, charging, and recycling of batteries on site could be regulated to ensure it is being done properly. The consumer would not have any different experience -- a quick pull in, batteries out, batteries in... on their way. The oil companies would still be involved since they would have control of the supply chain. [in fact, as with many other things, they might control a proprietary connector for charging so you would not be able to charge at home unless you spent a bunch of money on a charging system... Can you see Monty Burns rubbing his hands together yet?];) The power companies would be happy since they are still selling (more) power. The providers of alternative energy sources would be happy because all those batteries might be charged with solar or some other alternative. As a consumer, you would never bear the larger capital purchase of new batteries--because you are always getting a fresh set with every visit to a gas station.
Comments?
written by barry, February 25, 2008
written by Reinhard Gellert, June 06, 2008
Automated 5000 LB/day ice plants for Illinois horsemen, 1990-2000; Venus II Pat. No. 5,501,650
1983-1998; Fuselite birthday candles 2001-2004 with patents pending. AND I still live full time in an RV. Get a life.
written by Brian Estabrook, August 24, 2008
This article is typical of the incorrect assertions about the performance of the Prius in the local and national media(s).
My actual results from a daily 30 minute highway commute to work and back each day at speeds of between 60-75 mph (65 average)- I get 48-52 mpg like CLOCKWORK. period. This is always directly measured by miles driven / filled gallons. The accuracy of the odometer has also been checked.
On longer trips: example Boston to Maryland we get 50-54 miles per gallon at HIGHWAY speed.
Get over it... The Prius' hybrid technology is outstanding and will only get better with the next generation.
There appears to be a campaign of deliberate down-playing of the amazing performance of these hybrid cars and we as a IDE society should be ashamed of it.
That my thoughts on the hybrid subject - In my mind - case closed.
written by Uncle B, February 28, 2009
!
"There is as much wind power potential (900,000 megawatts) off our coasts as the current capacity of all power plants in the United States combined, according to a new report entitled, A Framework for Offshore Wind Energy Development in the United States, sponsored by the U.S. Department of Energy, Massachusetts Technology Collaborative, and General Electric". http://www.capecodtoday.com/news246.htm01/01/09
Honda is doing a noble job, but China, not GM-American is hot on their heels.
"The astounding Chinese have epoched the great GM, of U.S.A. in producing an Electric/gas/plug-in car! They are driving them in the streets of China as we speak, they will be retailed in the U.S.A. by 2011, they will cost half the price of a "Volt" and they are "On Order" for Israel! GM take a deep breath, your naughty parts have just been cut off by a Chinese high-tech competitor, and the "Volt" is still "Vapor-ware"!" See:http://www.cleantech.com/news/3983/chinas-byd-sells-first-mass-produced-plug-cars
And as far as paying something for nothing,
If the U.S. had chosen to be a moral people, and leaving Iraqi oil alone, and following Al Gore, decided to develop the South Western deserts, with the technology of the times - solar/thermal-molten sodium - electricity installations, for the same amount of money as that war cost, ($650 Billion), today, we would be tapping into the largest, renewable, sustainable, energy source the world has ever known. It would have paid every energy bill in the U.S.A. for maintenance fees only - FOREVER! It would be equivalent to an oil field that can NEVER run dry! Low cost electric power, and storeable hydrogen gasoline replacement from the electricity, for all!
After the millions of murders, and $650 billions of dollars, borrowed from our children’s futures and pissed away, with thousands of our own and others maimed and disfigured for life, millions of families utterly destroyed, ours and theirs, we are no closer to Iraqi oil production than the Iraqis are!
The next time you hear a blithering idiot spoiled brat, drunken, drug addicted, sociopath, rich Arabic saber dancing daddie’s boy oilman, stand at a microphone and threaten YOUR safety with someone ELSE’S weapons, remember what you lost America, remember, and weep! (also see http://www.sciam.com/article.c...grand-plan)
The idae that a petrol company has bought up patent rights toa a better battery will not deter the Chinese - they simply do not recognize patent laws, and are a lot bigger than a bunch of Yankee Lawyers, and do as they please, including considerable industrial espionage - if such a battery exists, it will soon be manufactured in China regardless of petty American based "Rights"
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It's interesting that they've gone to the effort of testing this in a car, because common wisdom would be that it isn't close to being cost effective. I wonder if there is actually something that they've done new that is getting it closer to being cost effective. The coverage I've seen doesn't really seem to indicate anything new.
Slow advances are being made in Rankine cycle engines. In the world of geothermal they use working fluids other than water with lower boiling points to make use of geothermal heat sources that are too cool for steam cycles. As they gradually bring down the cost of these binary Rankine cycle engines more and smaller geothermal resources become economically viable.