Comments by "ke6gwf - Ben Blackburn" (@ke6gwf) on "Technology Connections"
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In regards to the oil filled heater, it is more efficient, because you keep your temperature delta lower.
In your example of the 50% duty cycle, you didn't take into account that the standard heater is going to create a higher temperature when it turns on, until it reaches the set temperature and shuts off, and then the room will cool down until the heater turns back on, and if you graph it you will see the temperature going quite a bit above the set temperature, and then dropping below, and when the temperature goes higher, it loses more out the walls and ceiling and such.
With the oil filled heater, it stays at a much more consistent temperature, reducing the peaks, and so not pushing as much heat out of the room.
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@factsarefactsanddonotlie8397 if you have an electric water pump, you measure the amount of kwh of electricity it takes to pump 100 gallons of water from one location to another.
You are not creating water, only moving it from one location to another.
With an Air Conditioner, you are using electricity to move heat from inside the house and sending that heat outside the house, which is why the condenser coil outside gets so hot.
A heat pump reverses this cycle and puts the evaporator coil outside, and the condenser coil inside, and takes heat from the outside air and sends it inside.
Now, just like the water pump uses electricity to move water from one place to another, the heat pump uses electricity to move heat from one place to another.
If you run electricity through a heating coil, all the energy in the electricity gets converted to heat, so if you use one kwh of electricity, you get one kwh of heat.
However if you use that 1 kwh of electricity to run a heat pump, you can now MOVE 5 kwh of heat into the house, most of it coming not from the electricity, but being transfered from the outside air into the inside air.
This is why it gets what you think is impossible efficiency, because it's moving existing heat rather than only turning electricity into heat.
And if you say that this is impossible, then please explain how an AC can magically make heat energy dissappear from inside the house!
I doubt that you will understand any of this and will just flame me too because ego is more powerful than intellect, but maybe this will help you understand the subject a little better.
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@TheCatLady65 , I think you are confusing the meaning of Degree as a division on a scale, with degrees of angle or something.
All Degree means in relation to temperature is a whole number division.
For instance, if you raise the temperature of water, you say that you raised it 100 "degrees". It's just the word that describes the division of temperature scales.
And while Kelvin no longer uses the ° symbol, just K, that was more to streamline notation than anything, and it did used to use the symbol as well. But it's still perfectly understandable to say that you are measuring in degrees Kelvin, especially when outside of a laboratory, so that people understand you.
And, Celsius still uses the °C notation, which is Degrees Celsius, and maybe some obscure source has said to stop using the Degrees designator, but nobody listens to them, and it's still used most of the time by most people, so it's still proper.
And again, Degree is totally compatible with the Metric system, because all it means is the whole division on the scale, going from 1 to 2, etc.
So no incompatibility with metric!
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@factsarefactsanddonotlie8397 you act like you are an expert who somehow became an engineer without learning how to write or communicate, and like you are superior to everyone, but you keep contradicting yourself and saying crazy things.
Just a minute ago you said that there was a difference between a fridge and an AC, and that I was wrong, but now you are saying that they are basically the same.
Also, a lot of fridges do have a fan on the coil, and many HVAC systems, especially mini splits, have defrost capabilities as well.
So the main difference in a fridge is that it's cooling a small highly insulated box rather than a room.
And yes, some small or old fridges have imbedded coils in the walls and no fan, but they usually don't have a defrost cycle either, or use heat tape for the defrost etc.
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@factsarefactsanddonotlie8397 now I don't know what you are thinking about. I am talking about residential heat pumps for heating and cooling a house, the most common type being the mini split design, which is exactly an AC, because it IS an AC with a reverser valve that flips the flow depending on whether you need heating or cooling.
So in the summer time it works like every other AC, using the same refrigeration cycle to transfer heat from inside the house to outside the house, and then in cold weather one valve flips and now it moves heat from outside the house into the house.
You could literally take a window air conditioner and put it in backwards and it would pump heat into the house.
Yes, there are also industrial heat pumps that look just like industrial refrigeration equipment, but no one is talking about them here, but even then, the only difference between an industrial refrigeration unit and a heat pump is that the heat pump has an extra valve that reverses the condenser and the evaporator coils so the heat moves the opposite direction.
I also agree that insulation etc will save you more money than switching to a heat pump, but that's a separate issue.
A heat pump, properly designed and sized for the application, under most conditions, will produce a certain amount of heat cheaper than gas heat or resistive electric heat. In some situations it will be much cheaper, in others only slightly cheaper, but in nearly all cases it is simply a more efficient source of heat since it is moving existing heat rather than creating it.
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The problem with aftermarket led headlights is that many of them don't get the leds in the right position to simulate the original filament, and so the reflector doesn't get it focused into a nice beam.
The led design needs to be different between a projector headlight and a reflector headlight, and each headlight housing has a slightly different design.
If you don't get the correct match then you will blind everyone.
I needed to upgrade my semi truck to leds (halogen was too dim for safety, and I got tired of paying for the short lived and expensive High Brightness Krypton ones, so I decided to go with led).
It took me quite a while looking at articles and reviews and YouTube video reviews showing the beam patterns of different brand leds in different headlight housings before I finally settled on a couple of brands that looked like they might work, and then I pulled my truck up to a white dock wall and used a sharpie to mark the outline of the beam pattern with the halogen bulb.
Then I put an led in one side and compared the beam pattern etc, and then tried the other brand.
I found one of them matched every point on my markings EXACTLY, while the other one was a bit wonky.
So I put the good one in the low beams, and put the one with poor beam control in the high beams where it won't effect anyone, and I am happy with the results.
I also carefully re aimed the headlights afterwards, and parked on a level street and walked to the other end of the block to check for glare, etc, and I never have anyone flash me in complaint lol
But most people don't go to that much work, and don't even know there is a difference, and so blind everyone.
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@factsarefactsanddonotlie8397 a refrigeration system and an Air Conditioner work exactly the same way. There are many different ways to design the system, capillary tubes, expansion valves, etc, but the refrigeration cycle is the same throughout all of them.
When liquid evaporates into a gas, it absorbs heat, and when a gas goes to the lower energy state of a liquid, it releases heat.
An air conditioner, heat pump or refrigerator uses a pump to take gas, compress it and run it into the condensing coil where it releases heat and turns into a liquid.
This liquid then flows to the evaporator coil, through an orifice or expansion valve, where it sprays the liquid out onto the surface of the heat exchanger coil, and the ambient heat gets absorbed turning it into a gas, which then flows back to the compressor to repeat the cycle.
Is that technical enough for you?
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@factsarefactsanddonotlie8397 that's hilarious.
It sounds like you were having to Google search to see if I was telling the truth, which is why your argument keeps changing! I have not done a single Google search or fact checked anything in this conversation, because I already know this stuff! I am typing this all on my phone, and sometimes when I open Chrome while typing a message in YT, the message gets lost, so I don't even do that anymore, and I certainly didn't need to for this basic of a coverage of the concepts.
I work with this stuff, so I don't need to plagerize. But if that's the best gas lighting you can come up with, that I write like other experts do on the same subject, then I don't have anything further to prove.
But at least I made you search the subject to try to prove me wrong, and maybe you learned something about it, so I won!
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@Kalvinjj Japan has dual frequencies because they are separate islands, and literally like a century ago one island had a power company that bought US generators putting out 60hz, and the other island bought European generators putting out 50 hz, and it didn't matter because they were small generators and there was no connection between the islands, so one island just bought equipment and appliances from Europe, and the other one from the US.
Then as the grid was developed and more industry and power plants were added, they just kept building out the existing standard, because there was no issue with it.
And by the time someone realized that it might cause a problem, it was far too large an infrastructure on both systems to make the change, since you have to change out all the generators and power plants and motors on everything, so they are basically stuck on the two standards.
Now to interconnect the two grids, they have to use High Voltage DC to bridge them.
And unless you are traveling between the two islands regularly, it's not really an issue, because again, one uses standard European equipment, and the other uses standard US equipment, and China makes both! Lol
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@christo930 you don't have a clue.
The semi I am sitting in right now gets better fuel mileage at 80k pounds than my old pickup truck lol
And while I may use 4 times the fuel of the average car on the road at a slightly higher tax (it's cheaper when you are a commercial vehicle than what the sign on the pump says), I weigh 26 times as much,, and road damage is exponential with weight, so no, I don't pay my fair share lol
Also, very little power is generated by coal in the US anymore, and it decreases every year. And the places that still have coal fired power plants are also less likely to have a lot of evs.
In addition, oil production and gasoline refining takes a lot of electricity as well, so you have to include the emissions from the entire oil pumping, transportation, refining etc infrastructure, as well as the tail pipe emissions when comparing gasoline to EVs.
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@DrewskisBrews the reason Base 10 became common was for higher math. Adding and subtracting became much easier.
But it's not always logical in real world daily life, which is why so many old systems used 12 or 60, because it made sense when not being used for lots of calculations.
For instance, while MM and CM and Meter are very logical mathematically, they aren't very user friendly for a carpenter, because mm is too small for easy use and CM is not fine enough for most carpentry, and Meter is way too big, and nothing in between.
And because the cm and mm aren't far apart, the cm isn't very useful, so generally things are measured in mm, into the thousands of mm.
With the USC system, you have the inch as the base unit, and it's easy to visualize, easy to see, and when you need smaller than an inch, you just pick whatever fraction fits your needs, depending on the tolerances.
And then you can measure in inches, or inches and feet, etc, depending on your scale and needs.
I spent a while doing carpentry, and I have tried doing it in metric, and I find that USC just fits the job better, probably because it was developed by people doing the actual work, rather than theorists.
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@thedeadpoolwhochuckles.6852 if you think about the number of high precision certified scales in use in every manufacturing facility, factory, packing plant, laboratory, truck stop, lumber mill, store, Cannabis shop, pharmacy, etc etc etc, you would realize that a scale technician is most certainly a thing, because someone has to install and repair and calibrate all of them! Lol
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While you all think that this looks extremely complicated and impossible to understand or design, the funny thing about relay logic is that it's really simple, and most of you could figure out how to make a device that would do this if given a pile of relays and such. (or a virtual environment like ladder logic for a PLC.)
The difference is, it would look ugly and take up a whole room! Lol
The brilliance that these guys showed isn't really designing a machine to do all that, it's in making it so beautiful and compact and refined, all packed into such a nice layout with a minimum of components.
You are probably looking at this as the big picture, and it's unimaginable to design it, but if you break down each function needed to the basic level, it's pretty easy to design a system to do it, and then you just start stacking layers and adding interconnections.
There are a few bits that are more advanced, but mainly because it includes the mechanical design, but most of this is as simple as the latching relay in the first video, just layered up.
But, the way they layered it and massaged it into a work of art is delicious!
Almost as amazing as this video series, layered with humor tightly integrated into technology and videography, with a subtle garnish of sarcasm drawing it all together.
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