Peter Davey Heater

[ramset]

storre I was just told [EE]that pure sine waves[like the mains] have no harmonics is this possible  Chet

[storre]

storre I was just told [EE]that pure sine waves[like the mains] have no harmonics is this possible  Chet

How can we have harmonic distortion in the a/c. I found many references to it. Here are a couple:

THIS:

Institute of Electrical and Electronics Engineers (IEEE) Standard 519 which defines allowable harmonic distortion at customer service entrances

AND THIS:

Harmonic Interferance

AC power is delivered throughout the distribution system at a fundamental frequency of 60 Hz. (50 Hz in Europe.) Harmonics are defined as, "integral multiples of the fundamental frequency." For instance, the 3rd harmonic frequency is 180 Hz, the 5th is 300 Hz, etc. In the US, the standard distribution system in commercial facilities is 208/120 wye. There are three phase wires and a neutral wire. The voltage between any two phase wires is 208, and the voltage between any single phase wire and the neutral wire is 120. All 120 volt loads are connected between a phase and neutral. When the loads on all three phases are balanced (the same fundamental current is flowing in each phase) the fundamental currents in the neutral cancel and the neutral wire carries no current. When computer loads and other loads using switched mode power supplies are connected, however, the situation changes.

Switch mode power supplies draw current in spikes, which requires the AC supply to provide harmonic currents. The largest harmonic current generated by the SMPS is the 3rd. The magnitude of this harmonic current can be as large or larger than the fundamental current. Also generated, in smaller amounts, are the 5th, 7th, and all other odd harmonic currents.

Like the fundamental current, most harmonic currents cancel out on the neutral wire. However, the 3rd harmonic current, instead of canceling, is additive in the neutral. Thus if each phase wire were carrying, in addition to fundamental current, 100 amps of 3rd harmonic current, the neutral wire could be carrying 300 amps of 3rd harmonic current. In many cases, neutral-wire current can exceed phase wire currents. This extra current provides no useful power to the loads. It simply reduces the capacity of the system to power more loads, and produces waste heat in all the wiring and switchgear. When the 3rd harmonic current returns to the transformer it is reflected into the transformer primary where it circulates in the delta winding until it is dissipated as heat. The result is overheated neutral wires, switchgear, and transformers. This can lead to failure of some part of the distribution system and, in the worst case, fires. In addition, waste heat in all parts of the system increases energy losses and results in higher electrical bills. 3rd harmonic currents can increase electrical costs by as much as 8%

And many other references about it.

http://www.google.com/search?hl=en&safe=off&client=safari&rls=en-us&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=electricity+harmonic+fundamental&spell=1

http://www.utilitytrainingsolutions.com/courses/power-quality.html

Also I don't think we are dealing with a pure sine wave. Inductive motors create a lot of harmonic distortion.

So if you know your mains frequency and you want to vibrate an object that is shaped such that it has a natural frequency. Something like a bell shape or cylinder shape then it would make sense to make that object the correct size so it also vibrates at the same frequency as what is vibrating it. Just so it's not working against itself. The reason I think it causes the heating of the water is because the vibrations transmit off the bell much easier and stronger because it wants to vibrate at that frequency naturally because of it's size/shape.

Again if you want to push a pendulum so as to keep it constantly swinging but you can only do it by pushing it from one side and you can't adjust this rate of pushing then it would make sense to adjust the length of the pendulum so that it matches this pushing rate. The rate that it naturally swings at. Otherwise you will lose a lot of energy if you are pulsing faster or slower than this rate. So the frequency of the electricity is the pusher and the bell is the pendulum. They have to match exactly or be a *2 or /2 multiple of it or octave of it.

[b0rg13]

I believe it has been done over 100 years ago by people that saw music and electronics intimately related. If you've seen the Peter Davey videos you can see he's done it also. Water does not boil that fast even with 220v. I've tried it and a cup of water using a coiled up wire across to 110v mains takes at least 30 seconds to boil. It's actually pulling 2000W to do that. We have to see electronics and music as the same field of study. They are the same in terms of resonance. I will use the guitar again as an example. Tune the first and last string so that they are EXACTLY in tune with each other. If you strike the lower E string strongly without touching the higher E string and then stop the lower E string from vibrating you will hear the higher E string vibrating even though it was never touched. If you then detune (even a little bit) one of the 2 E strings so they are not in resonance with each other, then the effect stops.

This outer (or inner?) bell has to be tuned exactly to a harmonic of the oscillation of the AC mains. Then the bell will serve as an amplifier to the oscillation of the mains frequency.

The same theory holds true with the example of a soprano singer breaking a china glass by hitting the exact frequency of the glass. Put water on your finger and slide around and around the rim until it rings and then play that frequency on a sound system at a high volume and you can shatter the glass. I also read stories about how Keeley could break a quartz rock into powder with a resonator and how Tesla could vibrate a building to destruct itself using a resonator. They both understood the same thing and then some?

I think someone here will make a working model very soon

this seems like a good simple summery , i wonder how many shapes and sizes and how big you can go, and just how much power they will draw., i would love to know how to tune a small pipe to say 50(what ever it is), and then tune another one to that first one, from then i should be able to heat water........( i wonder if you can play a sound down a tube from an mp3 player with the right freq have it work that way)..

[AbbaRue]

The room humidifier I have seen uses ultrasonic frequencies to vaporize water.
The water never boils, it stays cold.  The ultrasonic frequency just vibrates the water
so fast that it turns into a mist. 

As for this device, he makes tea with it so this is something totally different.
I have a suggestion, maybe someone can capture the video and try feeding it
through some software that isolates different frequencies.
Maybe we can get the frequency right off the video. IF google video doesn't filter out the frequency. 

Otherwise if someone could get to visit this fellow and bring a recorder with them,
maybe they could record the background frequency too.

[edelind]

I have a suggestion, maybe someone can capture the video and try feeding it
through some software that isolates different frequencies.
Maybe we can get the frequency right off the video. IF google video doesn't filter out the frequency. 

Otherwise if someone could get to visit this fellow and bring a recorder with them,
maybe they could record the background frequency too.

You're missing the point. The frequency here is the 50 Hz of the main power line. Davey indeed uses the resonance, but by tunning the inside bell to the frequency he (we) already have for free. Of course, for a US device you need to make a 60 Hz resonating inner bell.

As far the outer bell, I am not sure if it must be tunned too, but the most important thing is to have the same shape and to find (by successive tests) the correct distance between the two bells, so the vibrations emitted by the inner one to reflect into the outer one and return back to it, in phase (i.e. making a stationary wave). This way an avalanche of resonance effect will occur and the energy transfered to water will rise suddenly and huge, with the same small input. This is the beauty of resonance!