bigflamingtaco

bigflamingtaco t1_j4zxrx2 wrote

I don't think we're on the same page here. I'm talking about using a tec fan with a portable propane heater instead of using batteries to run its internal fan, not using tec fans as a solution for all heat distribution requirements. You use tec fans with Mr Heater style propane burners and micro stoves as often used for winter camping. If you're running your buck stove in the living room and want to distribute the heat to the other end of the house, tec fans aren't going to do it.

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bigflamingtaco t1_j4v4asb wrote

What changed was the release of drilling data the reveled shocked quartz and other types of damage to multiple types of rock that doesn't happen naturally with earth's forced existed over a very wide area and to incredible depth. This data was the smoking gun that showed a huge impact crater did indeed exist, when previously we had suspicion but no proof of an impact.

And it gained even more traction when they did some more drilling to pinpoint the central peak, early 2010's I think.

Prior to the drilling data release, all they knew was there was ejecta all over the peninsula.

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bigflamingtaco t1_j4oltp7 wrote

How is free fan operation less cost effective than paying for electricity?

I don't think many are expecting tec fans to blast air across the room. Anyone that knows anything about peltier knows you don't get a tremendous amount of power out of them for the same reason they consume a lot of power to cool anything.

Mounting one to my Big Buddy heater is a heck of a lot cheaper than supplying the internal fan with D-Cells, which can't even make it through a single weekend of camping.

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bigflamingtaco t1_j1yzjl2 wrote

>There is actually a magnitude of difference from 120 to 150 in terms of horsepower needed.

An order of magnitude is not the difference here. My 250hp SHO did 144 mph runs. An order of magnitude would be a 2000hp car Vs a factory equipped Honda, not a car that can do 150mph Vs one topping out at 120, or even 100.

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bigflamingtaco t1_j19rx39 wrote

To remain in a gas phase, we also need to run at lower pressures, which decreases density of the gas, further decreasing the amount of heat you can absorb.

To compensate, you will have to move a LOT of gas, and your radiators have to be a lot bigger. You end up with a system that consumes more power and takes up more space to achieve the same temperature change in the medium you are trying to heat or cool.

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bigflamingtaco t1_ivih4fp wrote

Yes. The ELI5 is that water runs along the surface of the ground a hecka lot faster than it soaks into it, especially in areas that are good for growing crops, which typically have clay within several feet of the surface. Clay is almost like a rubber to water, it moves very slowly through clay, about 1/4" per hour is absorbed. Unless you are in a major flooding event that lasts weeks, clays just don't absorb water fast enough to replenish the water table, you need that weekly soaking to get there.

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bigflamingtaco t1_iscttde wrote

If you can find that, I'd appreciate a link, didn't see anything on their website.

Geeky Schmidt towed a small Airstream camper, and it cut his range in half. Unfortunately, that's not the typical camper as those things are ridiculously expensive, and they also sit low to the ground, which limits where you can go with them.

I average 20mpg unloaded, 10mpg with a 7ft wide cargo trailer. Although I wouldn't tow a camper at 70mph like in the above situations, a typical hard side camper is 8-8.5ft wide and sits about two feet higher at the roof. At 60 mph, it's also going to cut the range in half, or worse, depending on the trailers actual dimensions and amount of junk attached to the exterior.

Camp-inn did an aero study of their teardrops and found their trailer that curves at the corner side walls in the front cuts through air better than the traditional teardrop style of cutting at the top and bottom. Probably has to do with how the air becomes turbulent exiting the sides of the vehicle's. Would like to see more mfg's try alternate designs for better aero, including stuff like lower skirts and those things the truckers put on the rear of their trailers.

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bigflamingtaco t1_is5naga wrote

I agree, it's just not going to happen by 2025 or even 2035. Most of the amazing improvements to batteries that get announced take at least a decade to put into use, when they don't come up against conflicts that prevent them from making it to market, like an inability to scale and bring the cost down.

We've also got some infrastructure woes that need to be resolved. The amount of throughput needed to have corner electric stations that can recharge vehicles like they fill gas tanks is insane, almost no cities have anything close to that kind of power capability, and we know infrastructure takes forever to get updated. Even if everyone were to sign contracts right now, there aren't enough works to make all the components and to install everything within a decade.

EV's are advancing at a great pace, but ICE is still going to be around for some time.

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bigflamingtaco t1_is5ln5w wrote

Towing... a utility trailer with a lawnmower in it?

Check out TFL's tests on YouTube. You aren't getting 3hrs of towing on the extended battery with anything but a small trailer. Their larger trailer cut it to 150 miles. If you're dragging a travel trailer through the wind, will probably see 100-120 miles.

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bigflamingtaco t1_is3fw6q wrote

No, it doesn't. No one wants a light duty truck that weighs 9000lb and needs to be recharged once an hour or thereabouts just so they can tow their work or travel trailer. It's going to be a while before EV's are the solution for all things transportation related.

The most important innovations are going to be weight and size reductions. EV batteries are fat pigs taking up a lot of space and adding tons of weight.

The F150 lightning weighs 600lb more than my similarly equipped truck, but can only go for an hour and a half with a trailer. That's just not an option when an ICE driveline will give you over 4 hours with that same load between refills.

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