Climate in the 21st Century
- Thread starter Jimdamick
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DIY-HP-LED
Well-Known Member
It's a nice comfortable 23C here and it cools off overnight, the high today was 29C I believe, being on an island on the north Atlantic coast sometimes has its advantages. How's things in Hell?
cannabineer
Ursus marijanus
at least it’s a dry heatIt's a nice comfortable 23C here and it cools off overnight, the high today was 29C I believe, being on an island on the north Atlantic coast sometimes has its advantages. How's things in Hell?
cannabineer
Ursus marijanus
Not the record that was expected, but it underlines one remarkable feature of this desert heat wave.
The days are hot, but the nights don’t cool down much. That loss of livable “area under the curve” is brutal. My sleeping habits are in disarray, since it is hard to sleep in ninety-degree temps.
www.yahoo.com
The days are hot, but the nights don’t cool down much. That loss of livable “area under the curve” is brutal. My sleeping habits are in disarray, since it is hard to sleep in ninety-degree temps.
Death Valley Just Had The Hottest Midnight On Record
The measurements are still preliminary, but the heat is not letting up this year.
DIY-HP-LED
Well-Known Member
DIY-HP-LED
Well-Known Member
‘We are damned fools’: scientist who sounded climate alarm in 80s warns of worse to come
James Hansen, who testified to Congress on global heating in 1988, says world is approaching a ‘new climate frontier’
www.theguardian.com
DIY-HP-LED
Well-Known Member
Another company avoids risky Florida home insurance policies: Here's what caused the crisis
AAA is not renewing some homeowners insurance policies in Florida. It joins a number of companies that have pulled out or curtailed work in the state.
www.usatoday.com
Sativied
Well-Known Member
Not the record that was expected, but it underlines one remarkable feature of this desert heat wave.
The days are hot, but the nights don’t cool down much. That loss of livable “area under the curve” is brutal. My sleeping habits are in disarray, since it is hard to sleep in ninety-degree temps.
Death Valley Just Had The Hottest Midnight On Record
The measurements are still preliminary, but the heat is not letting up this year.
I vaguely remember cooling pillows, ever tried one of those?
And out of curiosity, is your house painted white?
cannabineer
Ursus marijanus
No; it’s painted a tan color very similar to the desert surface.
I rent, and the landlord is cheap. If I owned, the house would be white, and the roof in particular would have an airspaced canopy in “whitest”.
And I’d have enough solar (at ground level for convenient dust removal) to operate the a/c without grid power.
(I’d also look into having an electric car with the stored power take-off feature. That way I could charge by day and operate a/c by night, when the heat exchanger has the lowest gradient to overcome.)
Nice dreams.
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printer
Well-Known Member
Tesla driver shares disturbing video after being harassed by pickup trucks: ‘Should be a punishable federal crime’
"This type of behavior while driving should not be tolerated."
DIY-HP-LED
Well-Known Member
Integrating small 30 to 50HP axial flux motors into wheel hubs might be the future for many EVs and simplify design by reducing moving parts and the part count in general. All you would need is the electronic control unit and a next gen battery for a light, efficient EV with loads of room. Make the wheel hub/motor and battery cheap and you've got the ingredients for a cheap EV.
These things pack a lot of power into a small lightweight package and would be a good pick for electric aviation too. We have everything we need to go electric except good cheap batteries, but they are beginning to appear and there might be several options.
www.thedrive.com
These things pack a lot of power into a small lightweight package and would be a good pick for electric aviation too. We have everything we need to go electric except good cheap batteries, but they are beginning to appear and there might be several options.
Here’s How Koenigsegg’s ‘Dark Matter’ Electric Motor Makes 800 HP
Koenigsegg has developed one small electric motor before, however its new 800-horsepower "Dark Matter" unit is particularly impressive.
www.thedrive.com
big bud man 413
Well-Known Member
I heard somewhere you need coal to make them car batteries is that true?Integrating small 30 to 50HP axial flux motors into wheel hubs might be the future for many EVs and simplify design by reducing moving parts and the part count in general. All you would need is the electronic control unit and a next gen battery for a light, efficient EV with loads of room. Make the wheel hub/motor and battery cheap and you've got the ingredients for a cheap EV.
These things pack a lot of power into a small lightweight package and would be a good pick for electric aviation too. We have everything we need to go electric except good cheap batteries, but they are beginning to appear and there might be several options.
Here’s How Koenigsegg’s ‘Dark Matter’ Electric Motor Makes 800 HP
Koenigsegg has developed one small electric motor before, however its new 800-horsepower "Dark Matter" unit is particularly impressive.
DIY-HP-LED
Well-Known Member
Nope, there will be lots of different batteries most lithium based, but some sodium based and there could be other chemistries too. In a decade EVs will be seriously affecting demand for gasoline, they make energy independence possible for many or give them a lot of control over it by generating and storing their own. If you just use electricity for the home and transportation then it simplifies things, you can make and store your own power and you can't do that with gasoline. You can even sell excess to the grid or charge your EV or heat your domestic hot water with the extra solar power a hot water heater is equivalent to a home battery in terms of energy storage. Heat pumps for heating deliver 3 watts of heat for every watt of power and ground loop systems can be 5 times as efficient as resistive heating.
big bud man 413
Well-Known Member
Wow! Ok man thanks for the info.
Sativied
Well-Known Member
Lightyear uses in-wheel motors, it’s besides the solar panels their distinctive feature. Not axial-flux but radial:
In-wheel motors
Each of the four motors is a radial flux, permanent magnet AC machine with distributed windings. The concept design was produced internally before an (undisclosed) external supplier was contracted for more detailed design and manufacturing.
“We did look at axial-flux motors for some time, and we’re just on the edge of where it might make sense to do so, in terms of diameter versus axial length, as well as torque density,” van der Ham comments. “But in the end we went with radial flux because it makes air gap control easier.
“We tried it with axial flux, we built a prototype, and found it so much more difficult for in-wheel motors. If you hit a kerb or just corner hard, your sub-1 mm air gap is gone and your motor is ruined.”
From: https://www.emobility-engineering.com/lightyear-one/
DIY-HP-LED
Well-Known Member
One way or another wheel hub motors appear to be the way to go for smaller lighter EVs and this new axial-flux design should be used for aviation. The engineering challenges may be too great for axial-flux wheel hub motors of this kind in such a harsh environment but putting motors up to say 50 HP in EV wheel hubs will simplify the design and lower the costs of the vehicle in general. You only need 50 to 100 total HP for most small EVs, Kilowatt guzzler Trucks and SUVs would be conventionally powered with an EV drive train.
printer
Well-Known Member
Do you know anything about sprung and unsprung weight in a suspension? You want the mass at the wheel side of the spring to be low so the spring keeps the wheel attatched to the road. Good for traction and comfort. With the mass at the wheel side, bumps are transfered to the frame.
DIY-HP-LED
Well-Known Member
I'm familiar with sprung weight and its effects on suspension and think hub motors will be the way to go for lighter EVs, axial-flux designs would reduce this mass significantly.
cannabineer
Ursus marijanus
Coincidental to the axial/radial discussion, this was Googled my way this morning. Koenigsegg, that meth-drenched Swedish carmaker, has a “raxial” motor developing 600 kW. They’re a bit sly about how they get some of both.
Btw I dislike the term “forged carbon fiber”. What it is is die-molded random-orientation carbon composite shaped under high but static pressure.
“Forged” in my mind means heated to plasticity, then shaped either by very high static pressure (as by those thousand-ton die presses that turn out wrenches etc.) or under pulsed high pressure, traditionally with hammer and anvil to move metal.
I see “forged” in the context of carbon to be sales cant. It’s one of the reasons engineers and salescritters do not frequent the same bars. They hate each other, and the mix is hypergolic.
www.thedrive.com
Btw I dislike the term “forged carbon fiber”. What it is is die-molded random-orientation carbon composite shaped under high but static pressure.
“Forged” in my mind means heated to plasticity, then shaped either by very high static pressure (as by those thousand-ton die presses that turn out wrenches etc.) or under pulsed high pressure, traditionally with hammer and anvil to move metal.
I see “forged” in the context of carbon to be sales cant. It’s one of the reasons engineers and salescritters do not frequent the same bars. They hate each other, and the mix is hypergolic.
Here’s How Koenigsegg’s ‘Dark Matter’ Electric Motor Makes 800 HP
Koenigsegg has developed one small electric motor before, however its new 800-horsepower "Dark Matter" unit is particularly impressive.
www.thedrive.com
printer
Well-Known Member
But there will be more mass than current designs resulting in a compromised ride.