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fleebut

Ultimate flex

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In other words, the turbine isnt powering the vehicle, the DC motor is on battery power. The turbine can charge at a rate higher than the discharge of the batteries, so on a long trip it will cycle on and off as needed. It doesnt need to have much power if all it turns is a generator/alternator. How long the batteries last depends on load, so high acceleration rates will discharge it faster, but the load at cruise is much lower than while accelerating. The DC motors output would dictate the accel rate, not the turbine, so you could have silly power available despite the turbine being rather small. Of course the batteries would discharge faster under hard accel but once the vehicle reaches cruise it can catch up relatively easily.

 

Cool concept.

 

It would be interesting to plug the house into the car and utilize the exhaust heat from the turbine to heat the house and water. With a radiant heat system plugged into the water heater, the house would stay warm over a longer period of time because the water could act as a heat storage unit. Sounds quite efficient.

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Quote;

"#2- Where does the heat go?  The car behind you will need a new paint job if you get too close.  That's what happened in Germany when the U.S. deployed the M-1 tank.  A lot of folks got their cars toasted being too close to the turbine powered vehicle near them."

 

Actually I see that as an advantage-- No tailgators  ;D

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That a good explanation 455. The small turbine turns at 96,000 rpm, but perfectly balanced, just air noise am told.  Exhaust is flame hot, wonder how they control the heat?

 

Only the exotic expensive sports cars have these. The commercial N.G. Capstone last I checked cost $25k. This is their smallest 40 kw turbine/generator. This was just an simple electric installation. The auto turbine/generator was a stripped down version. Capstone had used generators, diesel ones coming back from military Iraq installations for $10k.

 

These are expensive engines for automotive, presently. Who know what mass production could bring cost to? The hot air turbine is the most efficient engine we have. The reason those modern vacations ships have them instead of diesel. The reason those tanks have turbines instead of diesel engines. The reason utility companies have hot air turbines making your grid power.  Even the nuclear reactor has steam turbines, but those steam turbines can't approach hot air turbine efficiencies. The most efficient engine setup to generate electricity with fossil fuels....a hot air turbine blowing the exhaust into a steam boiler powering a 2rd steam turbine. Roughly 60% thermal efficient or three times more efficient than a gas engine.

 

But, the grid has line loss, transformer loss, etc. at 10-15%, dropping effective efficiencies. Utility companies have no use for low grade heat, they just blow it away in those stacks you see blowing up plumes of steam.

 

If you own a home, garage, or business probably you would like low grade heat. This heat perfect for winter heating needs or cooling in summer with absorption A\C equipment. Perfect heat for hot water needs. Probably best to just heat hot water and store the btu in a insulated tank for long term use.

 

Don't forget the hybid auto uses the same battery storage and control equipment that homeowners use attempting to live off the grid. So, why not put the two together? Doesn't it make sense to utilize for both home and auto needs. The waste heat of your auto turbine attractive for home use. Same with electric power, that would be cheaper than grid power.  Same with the battery storage power for low use needs of home. Now, I'm guessing if living off the grid, still a home based battery backup required, when you motored away with the primary energy source. But, not near as big as without the hybrid auto.

 

Don't forget e100 would be ideal fuel, with such high heat. Now per the environmentalist dream, nothing beats a little wind generator setting a few feet away charging your batteries. Well, the little wind turbine that capable of supplying some serious energy would be seriously expensive and probably prohibited by zoning laws. And wind turbines uneconomical unless located upon some heavy wind zones. Places most of us not willing to live.  Maybe someday the cost of solar panels practical...decades away? 

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What to do with the heat depends entirely on how much there is. EGT on a gasoline engine is pretty hot, and catalytic converters run cherry red sometimes. If it isnt much volume a simple baffle would do the trick, similar to what we use on some jets to reduce the IR signature. After working around jets, even the large high bypass engines dont have much of a heat problem 50 feet behind them, jet wash is another thing entirely. On a cold German winter night you have to be pretty close to that C5/C141/C17engine to feel any warmth from it. On a nice August day in Kuwait it can get a bit toasty, but its already 110-130F. If someone is driving close enough to an M1 to get singed, they are way too close to it, besides that engine is capable of something like 1600hp, not 47. Huge difference there.

 

Just sayin.

 

Model aircraft turbines run on either methanol, white gasoline, or ethanol, they have the most heat associated with the gasoline. The heat produced by them isnt horrible, and the cost isnt astronomical either. Sure compared to a much smaller piston engine they are pricey, but the turbines are only two to three times more expensive than a large ci model engine. Lots of interesting stuff out there, just need to find a different way to use it.

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The Volt design intent is to utilize plug in power, leave the batteries 1/2 charged? Problem arises when running the IC engine under partial load with poor efficiencies. Do they throttle engine, like when going downhill? What I was reading probably out of date.

It's not a hybrid, but an extended range EV so you probably get some regenerative braking when braking or decelerating, but no major charging of the battery occurs with expensive gas, but instead with the cheap ac when plugged in.

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The electric turbine is different from those used for airplane propulsion. The jet engine mechanical power just enough to power the compressor end. The power turbine end is small as all of the propulsion from jet stream.  The tank would be equivalent. Are they electric or hydraulic/mechanical?

 

The bigger turbines are more efficient as less leakage zones per hp produced.

 

All internal combustion engines utilize compressed air. The most efficient of air compressors, that's right the turbine. Compressing air takes energy that shows up as hot air or hot engine. The turbine has very little friction, all the energy goes to heat air. The compressor energy is locked into the hot air, not wasted upon cooling radiator.  Same with the power cycle. Also, the diesel theory has better efficiencies with higher compression. A direct effect. But, the rings designed to exert higher rubbing forces with higher pressures. This negates efficiencies of high compression. The turbo minimizes the effect, even in piston engines. The turbine can push high compression and have no mechanical friction loss.

 

In hybrid cars, how about the turbine generator waste heat utilized for thermal battery storage. Metal salts have been utilized for their phase change latent heat storage capability. Becoming liquid at high temperatures and releasing lots of btu upon cooling to solid. Or just plain steam energy? A high portion of auto fuel may be captured back within btu storage....heat energy valuable for homes or businesses. The turbine would generate mostly free energy to the car as the fuel btu energy doesn't degrade much running through the turbine. Kind of like a portable boiler. And yes, those companies with a tube boiler have little increase in natural gas consumption when fitting a micro turbine generator to the burner.  Like getting free electric.

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Are the airplanes going the same speed? Speed wastes fuel, like autos. Also, playing into that the air density. Short hops low altitude the domain of piston engines or turbo props, as why waste all that energy climbing to high altitude. The per passenger mileage for a full jetliner is very high, at least with long trips. Better than a car. Jet engines still tweak higher efficiencies for new generations. As materials and processes improve the turbine jet gets more efficient. Ceramic has long been the dream material. The stationary turbines (less stress) use ceramic. They have to slow them down a bit, but experience a jump to 50% record breaking efficiencies. Check out Wilson for one.

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Are the airplanes going the same speed?

 

Ag spray planes are what I know the most about. My Dad had a plane that had a 600 hp Pratt Whitney radial that was WW2 vintage. When he made a swath run it was about 100mph and burned about 35 gph. The guy he sold his business to has the same basic airframe with a 550 shp Pratt Whitney turbine that burns close to 60 gph and goes about 140 mph across the field. The turbine's nose looks like a point compared to the old radial. Remember when Chrysler did the turbine thing back in the 60's and I have an old Over Drive truck magazine from the early 70's where Peterbilt and others were testing turbines coupled to Allison automatic transmissions.

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That's interesting! A farmer close to freeway brings in the crop sprayer. A few times watched him from free way dive in after clearing or pulling up to clear the high voltage wire. Wow

 

Once I saw Jimmy Johnson with an outrageous hp turbo prop stunt plane. He could land and take off like a helicopter. He adapted some military helicopter turbine...don't think it was fuel efficient. 

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