RockinRobin-69
RockinRobin-69 t1_j6wl776 wrote
Reply to comment by wanted_to_upvote in What are the effects of adding rock salt to a cooler full of ice? by Ok_Kareem_7223
Salt lowers the freezing point of water. This causes some of the ice to melt. The melting requires heat energy and this makes the solution drop in temperature.
Take two bowls and put an ice cube in each. Add salt to one. Watch.
Edit cure to cube
RockinRobin-69 t1_j6v2sjw wrote
Reply to comment by FVjake in What are the effects of adding rock salt to a cooler full of ice? by Ok_Kareem_7223
In this case the colder ice water and the 32/0 degree ice water have the same amount of heat present.
They started in a cooler and the addition of salt made the change in temp happen relatively quickly. It’s colder as the melting ice takes heat energy from the water, cooling the water.
The cooler will have cold on one side and ambient on the other. The colder it is inside the more heat transfer through the walls.
I’m guessing that this is their perception only. It would be an interesting test.
RockinRobin-69 t1_iyb4tbl wrote
Reply to comment by Graega in New EV entries nibbling away at Tesla EV share, according to S&P Global Mobility by dreamcastfanboy34
I see what you did there. Very clever.
RockinRobin-69 t1_ixt1xtu wrote
Reply to comment by patrickstarpenishead in Electric-vehicle charging stations could use as much power as a small town by 2035 — and the grid isn't ready by Sorin61
I get your point. That was a single piece of equipment in a massive plant. The utilities had no problem supplying us.
Having charging stations use the power of a small town is actually not that big of a deal right now. Having many of them in 13 years is not that big of a deal.
RockinRobin-69 t1_ixssyad wrote
Reply to comment by patrickstarpenishead in Electric-vehicle charging stations could use as much power as a small town by 2035 — and the grid isn't ready by Sorin61
I was mostly just curious so I did some quick math. There seem to be some pretty knowledgeable folks here. If I get something wrong, just tell me and I’ll correct. 2500hp X 0.746kw/hp X 24hr X 365 =16 million kwhr. An average house is about 10,000 kwhr per year. That motor was worth 1600 houses.
RockinRobin-69 t1_ixsa9ga wrote
Reply to comment by patrickstarpenishead in Electric-vehicle charging stations could use as much power as a small town by 2035 — and the grid isn't ready by Sorin61
We had a separate building for the variable frequency drive. We weren’t allowed to start it across the line. It would have browned out the city.
RockinRobin-69 t1_ixqbf42 wrote
Reply to comment by sighbourbon in Electric-vehicle charging stations could use as much power as a small town by 2035 — and the grid isn't ready by Sorin61
Can confirm. I worked at a chemical plant. We had a 2500 hp motor. It used more electricity than a small town. The power company had conditions for turning it on, but they were more than happy to supply us with, and charge us for, power.
Edit; hour to hp
RockinRobin-69 t1_je1espn wrote
Reply to comment by remarkablemayonaise in How does an ideal vacuum have a dielectric breakdown voltage of 10^12 MV/m? If there is nothing there, then how can electricity pass through it? by skovalen
Yes. I didn’t want to get into “there is no such thing as a vacuum” because of quantum. While true it probably doesn’t affect dielectric constants.