Comments by "ke6gwf - Ben Blackburn" (@ke6gwf) on "Technology Connections"
channel.
-
1
-
1
-
1
-
1
-
1
-
1
-
Time for more corrections. Too much wrong information in this video.
THHN is a specific grade of insulation in single conductor wires, specifying the temperature rating, cut protection etc.
Romex is not nor does it contain THHN wire.
THHN is the type of wire that will often be used to connect the meter to the main panel, or inside equipment, and is only used in conduit or inside equipment enclosures.
It's what you will find on spools as individual conductors.
THHN has a 90 c temperature rating, while NM/B such as Romex (which is the trade name for NM/B cable sold by Southwire) is rated at 60 C.
Secondly, while Romex is often color coded THESE DAYS, the color code didn't come about until not that long ago, and even now it's a voluntary standard, so while most use it, it's not reliable, you have to read the marking on the cables.
If you have an older house, chances are that all the Romex type cable will have a white sheeth.
The reason a coiled up cable can overheat isn't just because of possible but unlikely lack of air flow, but, wait for it, induction and basically acting like a transformer coil.
1
-
1
-
1
-
1
-
1
-
You need to do a video on cold air intakes on engines and why it helps, because you clearly don't understand the principles lol. It is to get more air into the cylinder by reducing volume.
A cold air intake, or an intercooler on a turbo charged engine, is there to increase the density of the air, thus making it possible to fit more air into the cylinder, because the engine works by heating the air up and making it expand.
So if you put hot air in, it's already partly expanded and so you get less power.
Think about how a turbo is trying to squeeze more air in by increasing the pressure, doesn't it make sense to decrease the temperature as well?
This is also one of the reasons water injection is used in some performance engines, because it cools and densifies the charge air.
Nitrous injection also does this.
So on an ICE, cooling the intake air is entirely to increase density, and the amount of air that will fit in the cylinder, thus having more air that can expand a greater amount when it's heated.
Remember that an ICE is still a heat differential engine and so the greater the heat differential, the greater the potential power.
For clean combustion however, preheating the air is very helpful and important, because if you preheat the combustion air, it allows the flame temperature to be higher, leading to a more efficient combustion.
Industrial oil burners often preheat the air with exhaust heat for this purpose. Google "preheating air for combustion" etc.
So if your end result needed is expansion (ICE, turbine engines, rockets, etc), then you want to have your intake air as cold and dense as possible, (see SpaceX superchilling their propellant), but if you are just going for heat production, preheating is important.
I will also mention carb heat on planes and the old engines that had heat stoves or the intake manifold heated by the exhaust manifold.
That is very in-ideal, but to solve a problem with gasoline not evaporating properly, either due to the use of carberators that didn't evaporate the fuel well, or due to the cold temperatures in high altitude air.
But generally the cars with those features were not high performance cars, or they had thermostatic dampers on the heat stove, so it only helped while the engine was cold and then shut off the heat.
1
-
1
-
I really don't like your revisionist history, talking about all the other brands and models currently using CCS, and ignoring the fact that for most of the existence of Tesla, they WERE the defacto industry standard, simply because they had almost no competition.
Not to mention that the BetaChademo standard was competing against the VHSccs until just recently, so getting bitter against Tesla is well misplaced.
Also you left out that Tesla attempted to get the other manufacturers to sign on and use the much superior Tesla standard, but the other manufacturers wanted to pretend that Tesla didn't exist, and so they created a second design.
Plus, Tesla built out most of its supercharger network before CCS really took off or there WERE any other options for Tesla drivers.
So while you have valid concerns about the situation for Tesla drivers, the way you go about bitching about the industry leader is pretty petty.
Remember that without Tesla having built out such a large proprietary network, we wouldn't HAVE a robust EV market today, because Tesla literally had to create the infrastructure before people would buy the cars, and so the giant proprietary network was not an option, but the only way to do it.
Now that the company is stable with plenty of cash flow, and they are able to install chargers faster than they can build cars, and there are just beginning to be 3rd party alternative charging networks that actually work, they are starting to move towards making it so Tesla's can at other networks easily, and also opening up the Supercharger network to other brands, but only as they are able to expand the network so that the Tesla owners don't have to wait for a line of Ioniqs at a Tesla facility.
If you were a Tesla owner, you would be happy that you don't have to deal with all the other EVs on the road charging at "your" station, kind of like how only Costco members can get gas at Costco.
As I see Tesla building chargers in every shopping center and restaurant district and random farm fields along the freeway in the middle of nowhere, some with hundreds of stalls, just a few miles down the road from others with hundreds of stalls, I see them getting to the point where they can start opening up to other brands, and just continue rolling them out as fast as they can get permits.
It's kind of like how they aren't rushing to introduce more car models until they get production ramped on the existing models and have headroom to take on a new challenge, they had to get their network expansion ramped up fast enough to be able to handle outside customers, rather than just serving the Tesla fleet.
And since all the early Model S cars that were built before CCS even was spawned from the pits of committee hell are STILL on the road, they couldn't just stop installing new Tesla connecters, because they would have had to retrofit all the older cars, as well as all the existing chargers, home chargers, etc.
You treat it like it's saying that Apple should sell new phones with USB C, when really it's more like Apple having to upgrade the last 5 years of phones to work with USB C, and send out new chargers and battery packs to all their customers.
Oh, and most Tesla owners would not WANT to "downgrade" from Tesla to CCS! Lol
So I look forward to the adapter coming out to give Teslas charging options, and a slow rollout of CCS capabilities at Supercharger stations to allow 3rd party charging.
Probably only a few stalls with CCS, and the rest are still reserved for the only currently large fleet of EVs in the US!
(I have seen just 2 Ioniq5s in California so far, one of them today. I like the looks of it as much as I want to wear your brown tweed jacket.... Smirk)
1
-
1
-
@TheMax13542 most houses that I have ever been in that have ducting have poor design and don't get even distribution.
Yes, zoning etc is possible, but most houses don't have zoning, and installing it after the fact gets real expensive real quick.
So if you have a well designed central ac system already, then replacing it with a traditional heat pump is obviously the best option, but if you have a central ac that freezes one side of the living room and one bedroom, but leaves the other bedrooms roasting on the sunny side of the house, or if you have one person who likes sleeping in a cold room and another who likes sleeping in a warm room, then mini splits all of a sudden make a lot of sense, because you can control each room individually, which pretty much no central system allows.
In addition, if you are able to only heat or cool the specific rooms in use, rather than keeping the entire house at the same temperature, you may be able to save considerable energy.
Plus, if you have uninsulated attic ducts, undersized ducts, dirty ducts, etc etc, the central system loses a lot of efficiency, which again can't be solved without a major and expensive central heating system upgrade.
So you have to look beyond just the box sitting outside, and at the whole system, and remember that most house central air systems are built as cheap as possible, and usually suck.
1
-
1
-
The thing that you failed to mention as you repeatedly complained that the world leader in EV innovation hadn't invested millions of dollars in upgrading every existing car to a new charging port, is that Tesla uses a "proprietary" connector, BECAUSE THEY WERE FIRST, and nd they attempted to get the industry to use the same connector as the standard, but certain other car companies hated Tesla, and so refused to use the standard, and developed their own competing standard.
By this time however, Tesla had lots of customers using the Tesla connector, and had invested billions into building out their Supercharger network, which is what has made worldwide EV adoption possible, because people see that it works if you build the infrastructure, which no car company wanted to do.
So now in order to change to the late comer standard, they would have to invest billions in upgrading the existing US Tesla fleet charge ports, home chargers, destination chargers and Superchargers to the new port, and do it all at once so that no customer with free lifetime charging got stranded at a Supercharger with the wrong port.
And if you think that someone with a $100k car is going to be happy having to use an adapter, you are wrong!
Also, most Tesla owners don't want the change, because one of the value added benefits of owning a Tesla is that you don't have to compete with all the other makes at a charging station.
You are part of a dedicated ecosystem that is expanded as needed as more Tesla's are sold, rather than having to fight for space with cars that don't contribute to the build out of more chargers.
It's kind of similar to why it's not likely the US will convert to metric, because it would cost billions of dollars to do, with very little benefit for the average person.
1
-
1