Follow Slashdot stories on Twitter

 



Forgot your password?
typodupeerror

Comment Re:Winter (Score 1) 69

I'd argue that it is still a factor.
Not a lot of convertibles in Alaska.

And there are vehicles up there that, despite being all ICE, that work better or worse to the point that yes, it is an issue.

Then keep in mind that we're still effectively with the "first year" models. Odds are the underperforming companies will fix their performance sooner or later, or get outcompeted by those that do.

Comment Re:Winter (Score 1) 69

Real world testing gives a wide variety of range reduction in cold weather, depending on the make and model of EV. Some are really good at maintaining range, some are lousy at it.
In any case, preheating the cabin and battery cuts that substantially, and you generally don't need to keep warming the battery while driving as the regular discharge and charging from regenerative braking keeps the battery at operating temperature to limit range loss.
It's a contribution, but it isn't something like 30% is what he's getting at. More likely ~5%.

Comment Re:Makes sense (Score 1) 69

That doesn't change that if you're looking at comparative advantage - most CO2 saved for a given amount of battery, for example, delivery vans are an obvious pick before the EV freight trucks.
Though even with the freight trucks, one could concentrate on local delivery routes before longer haul ones to maximize savings.

Comment Re: hello from Europe (Score 2) 69

NYC: 8.5M
LA: 3.9M
Chicago: 2.7M
Total: 15.1M
Population USA: 342M
1 in 22.6 people live in those 3 cities.
On the other hand, if we include the "metro area" and not just city proper:

NYC Metro: 19.9M
LA Metro: 12.8M
Chicago Metro: 10.1M
Total: 42.8M, 1 in 8 people.

The math checks out if one uses metro instead of actual city. Basically, "metro" areas include the suburbs where many would commute into the city to work.

On the topic of electric vans, they would still totally work for deliveries through the metro area, not just the city core.

Comment Re:Self-accelerating decomposition (Score 1) 96

Making turbine blades, whether for plane engines or fixed power, is one of those fantastically expensive and complicated processes that we don't really build excess capability for it.
So any serious increase in demand first requires building more manufacturing capacity, whether that be in the USA, China, or elsewhere.
And the manufacturing equipment alone demands like a year's lead.

Comment Re:Jet engines (Score 1) 96

Combined cycle gas turbines can be 60-62% efficient. This is burning the gas in a turbine then scavenging the heat in a steam boiler.
Simple cycle turbines are 30-40%
Boilers are 33-42%, supercritical 45-47%
The biggest diesels in the world barely bust 50%.
Turbines, like with ICE engines, can be designed to produce more power for their size or be more efficient. Generally speaking, efficiency is emphasized for fixed installs. Bigger for a given power is more efficient.

Comment Jet engine efficiency (Score 1) 96

It depends on how it is set up. A combined cycle gas turbine system can hit 62% by burning the gas in a turbine then using the waste heat to run a boiler with its own turbine.
Around 30-40% just for the simple cycle, without heat scavenging.
Boiler systems are 33-42%, close enough that the exact install matters compared to a simple cycle turbine.
Get very fancy and very hot with the boiler and you might hit 47%.

Submission + - Python Software Foundation refuses $1.5 million grant with anti DEI provision. (blogspot.com) 1

Jeremy Allison - Sam writes: The PSF has withdrawn a $1.5 million proposal to US government grant program.

"We became concerned, however, when we were presented with the terms and conditions we would be required to agree to if we accepted the grant. These terms included affirming the statement that we “do not, and will not during the term of this financial assistance award, operate any programs that advance or promote DEI, or discriminatory equity ideology in violation of Federal anti-discrimination laws.”

Slashdot Top Deals

"No job too big; no fee too big!" -- Dr. Peter Venkman, "Ghost-busters"

Working...