kerneldrop
Flashlight Enthusiast
fuel increase solution
That would be a variant of the strong series hybrid where the engine exists to spin the generator although perhaps more of an EV with a range extender. Concept didn't really take off in the automotive world, however as jtr has mentioned this has been standard in diesel-electric locomotives for going on a century (albeit mostly for reasons of packaging - a mechanical transmission up to the task would be impractical). The Volt was initially proposed to have this arrangement but instead opted for the ubiquitous parallel hybrid (strong-parallel hybrid in the Volt's case) to improve efficiency when operating on gasoline. The BMW i3 REX used this arrangement with the engine operating purely as a range extender for what was otherwise am EV, but its popularity in the market was meh.It's not a traditional hybrid in that the ICE* engine only generated electricity for the electric motors to use.
.. there is also batteries to be a buffer/aid the electric generation.
Peak demand vs average demand. While it might take a mere ~20HP for a modern ~1½ ton vehicle to maintain highway speeds, it would take an unacceptable period of time for that same ~20HP engine to accelerate to highway speeds.I've always been puzzled myself why automobiles use huge engines which output many times the average power the car needs
Low RPM limits on reciprocating-piston engines relative to electric motors. Stress on the crankshaft scales to something like rotational speed to the fourth power, putting a hard limit on how fast the engine can turn.and have a highly complex multi-gear transmission.
Took the development of NiMH with sufficient energy/power density to make that juice worth the squeeze. I gather that power electronics also weren't compact/cheap/capable enough until about this timeframe to manage the DC:AC conversion gracefully.That said, the aforementioned system would have been the way to go until we had batteries of suitable energy density to give vehicles adequate range.
Formula E seems to have figured this out in 2014.The required current draw, the heat, the gigantic safety concerns vs. the current accident protocols for safety workers and crews
This is the real impediment to development of NASCAR electric series. I could imagine an arms-length support series being embraced by NASCAR as a hedge, but not as a replacement.nevermind the actual fanbase
That seems more plausible. Keep everything but the toxic gasoline fumes. The loud V8s are probably the biggest draw anyway.Glancing at Chauncy's link, it seems more likely that hydrogen-fueled V8s will be demonstrated - simpler development path and keep much of the visceral sensation associated with stock car races.
If I understand the technology correctly, they claim the device will "cauterize" the walls, effectively making a casing as you go along. If so, then #3 is less of a concern.Ok, I heard back on the geothermal question. I can't copy/paste the email in its entirety, but will see what I can do.
This is coming from probably the best petroleum engineer specializing in drilling, hole integrity, etc on the planet.
Executive summary: pipe dream, no pun intended.
Issues:
1. energy delivery that far underground from surface
2. if deliver energy via downhole device, electronic component integrity at those elevated temps
3. since no casing is installed, wall stresses will implode hole at point of penetration
4. heat loss as thermal fluid comes back to surface will be massive
5. heat transfer in granite is low... this leads to rapid thermal depletion of the surrounding area
6. if anything like this was to work... it would need to be twin horizontal bores with a large fracking field between them to give a larger flow and large enough heat producing area
As an aside to #2, NASA is developing silicon carbide chips good to 500C for the venus proble.
If I understand the technology correctly, they claim the device will "cauterize" the walls, effectively making a casing as you go along. If so, then #3 is less of a concern.
...
I don't disagree with any of that but it'll be interesting to see what this leads to. It still sounds very promising for less ambitious drilling projects than what they're attempting. Maybe Elon Musk should fund this since he's already looking at new technologies for boring holes.Well we've got a disagreement between 'they claim/project/anticipate' with literally the top downhole guy on the planet saying a flat 'nope'.
Additionally... the rock has to go somewhere. I'm envisioning more of a sandblasting process (as per the video) where the ablated material would attack the walls as it exits the borehole.
Drilling new boreholes practically on a schedule is a fact of life for existing geothermal that's not next to near-surface magma ala Iceland's plants.5. heat transfer in granite is low... this leads to rapid thermal depletion of the surrounding area
Seems like drilling issues will keep this from blossoming. "Tip of the Spear" working conditions in such an enclosed space, feedback questions with regard to determining rate of drilling, irregular 'cauterizing' with the difficulty of keeping the working tip centered in hole? Cost/benefit ratio? Hopefully it will work.
Thanks Turbodog.