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Simple induction heating

March 12, 2018 Workshop / Different 331 226 104

Induction heating has a significant advantage over tenov. The main criterion here is the efficiency of converting electrical energy into heat. The article will discuss how to make a super simple induction heater from finished devices and parts. It will take you no more than two hours to build. With such a heater, with a capacity of about 1 kW, it will be possible to heat a room of about 30 sq.m.

What is needed for an induction heater?

. It is not so expensive and has a power consumption of about 1 kW.
Radiator. I took bimetallic. The number of sections depends on the area you need to heat.
Corrugated metal hose - can be bought at any plumbing store. It will take 1.5 meters with a margin.
Fitting and couplings for connecting the pipe to the radiator.
A piece of copper pipe to close the circuit.

Radiator and tile:
Any induction hob has a power adjustment, with which you can adjust the heating temperature of the radiator.

Corrugated pipe - water connection:

Bend the tube like a snail or spiral. She bends easily with her hands. The circle area of the cochlea should be larger than the circular heating surface on the tile.

The main thing is not to forget to make the jumper of this circuit, otherwise nothing will work. I made it from a copper tube, soldered to the beginning and end of the spiral. Now the circuit is closed and all the induction power will be directed to heating.

Induction boiler is ready. In fact, it consists of a purchased induction cooker and a spiral made through which water will pass.

We fasten the circuit to the battery.

Under the curl we put the tile.

Pour water into the radiator. When heated, it will circulate in the system itself, an additional pump in this case is not required.
Turn on and check. First we set the minimum power on the stove, and then, if necessary, on the maximum.
On expensive models, you can immediately set the heating temperature and the tile itself will support it.

I calculated the approximate efficiency of the induction heater in comparison with the heater on the electric heating elements. And it turned out that the efficiency of an induction heater is 3.5 times higher than that of a heating heater.

Watch the video

For more detailed experiments and system upgrades, see the author’s videos.

Assembly of the boiler itself.

The choice of induction hobs. Revision.

Connection of automation.

Testing in a water heating system.

come back

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Comments (104)

#1 nigrigos59 Guests March 12, 2018 2:05 p.m.
24

there is an immutable rule - for 10 square meters of 1 kW of power, everything else is from the evil one
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1. #2 Novel Guests March 12, 2018 18:05
  3
  
  This is with severe heat loss. On average, 50-70 watts per square meter with a ceiling height of not more than 3 meters
  
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2. #3 Guest Nikolay Guests March 12, 2018 20:37
  0
  
  Not quite right. I personally checked a steam drip heater for 2 days. Hung with counters, thermometers, volts and ammeters. Honestly, I did not think there would be any effect.Oddly enough, I received 10-15% less consumption than mycothermal convector. Maybe something was not taken into account, although he tried very hard.
  
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3. #4 Guest Vasily Guests March 14, 2018 09:45
  3
  
  Your immutable rule is complete nonsense. 4 rooms sq. 97.3 m2, in January 3017, the consumption of thermal energy by IPA amounted to 1.4376 Gcal, which is equal to 1,671.929 kW. Divide the kW for 31 days, for 24 hours, by the area of the apartment, we get 23.0957 watts. In the apartment +20 ... + 21. House of 1959, thermal resistance of about 2 units
  
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  1. #5 Edos Guests March 24, 2018 15:37
    3
    
    CHiP was calculated on the basis of an average daily temperature of -25g. !!! and for houses as a whole, heat losses of roofs, MOPs, etc. were included here.
    
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  2. #6 Guest Andrey Guests April 9, 2018 10:35
    6
    
    Well then technology 3017 years!
    
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4. #7 the guest Guests March 19, 2018 2:04 p.m.
  1
  
  Correctly, but this rule applies to solid fuel boilers, and for electric boilers a completely different meaning. it is 1 kW per 18 m / 2
  
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#8 Guest Vladimir Guests March 12, 2018 19:06
21

complete nonsense. any shadow electric boiler has an efficiency of at least 98%.
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1. #9 Alexpanych Guests March 13, 2018 11:24
  0
  
  And where do these 2% go?
  
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2. #10 Guest Vasily Guests March 14, 2018 09:49
  5
  
  Wow, 98% !!! Wow, they could, give the company a manufacturer of electric heaters with such an efficiency. So far, I have not seen more than the real 86% in passive heating elements
  
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  1. #11 Guest Sergey Guests March 14, 2018 1:33 p.m.
    4
    
    Sorry, do not tell me, but where do the remaining 14% go?
    
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    1. #12 altmax Guests March 19, 2018 19:12
      11
      
      Go into heat. 86% go to heat the water, and 14 just heat the water)))
      
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      1. #13 Edos Guests March 24, 2018 15:45
        9
        
        86% for heating water, and 14% heats water !!!))))) this is SUPER !!! You do not have Klitschko last name?
        
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  2. #14 Dmitry Guests March 15, 2018 10:10 PM
    16
    
    The ten's efficiency is 0% since it does not work, and all the energy goes into heat. But since we also need heating to obtain heat, an efficiency (in thermal energy) of 100% is obtained. And more than ten can not have efficiency.
    
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    1. #15 George Vitalievich Guests April 4, 2018 18:44
      0
      
      Yours took ..!
      
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  3. #16 Vania Guests March 30, 2018 8:14 p.m.
    0
    
    in the electric circuit, the power source is a heating element (active consumer 100%) where there may be losses ????
    
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    1. #17 Igor Albertovich Guests October 15, 2018 10:01 p.m.
      0
      
      Not all current energy in ten is converted into heat. When heated, the body expands. At least so!
      
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3. #18 Zheka Guests March 21, 2018 21:03
  5
  
  And the rest is a vortex magnetic field, which heats the surrounding conductors and generates ultra-long radio waves. So, given this, almost 100%.
  PS Even the heating of a poor-quality outlet and poor wiring is not wasted, heats the room.
  
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  1. #19 Alexander Guests April 8, 2018 18:23
    3
    
    Even heating low-quality sockets and poor wiring
    not wasted.
    
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4. #20 Guest Alexander Guests July 12, 2019 19:43
  0
  
  Laugh at the Christmas tree !!! That 98% cost - yes. In general, all the heating elements are the last century. BUT because these heaters are the easiest to manufacture and practical use, it is still difficult to refuse them. But the energy shakes mercilessly !!!
  
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#21 deficit21 Guests March 12, 2018 19:24
77

I have been involved in heating and water supply for almost twenty years. But I see such crazy nonsense for the first time !!! The author himself probably imagines himself a modern Albert Einstein of the 80th level. Quite true for 10 square meters of 1 kW of power, and no matter what the boiler or heating element is, electricity will be spent SAME whether it is heating, induction, infrared, etc. The difference in heating time. And in this case, one radiator is cheaper to buy: an electroconvector infrared or an oil radiator. This home-made bomb, without an expansion tank and a safety group, will work exactly until the first good heating !!!
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1. #22 Guest Gennady Guests March 13, 2018 02:59
  17
  
  + 100%. I agree - another stupid thing.
  
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2. #23 Helge Guests March 14, 2018 13:10
  12
  
  You are absolutely wrong. If you take a certain structure, then with a static external environment that absorbs heat, such as a street, you will be forced to spend a stable amount of thermal energy to maintain the desired temperature inside the structure. However, this does not mean that the generation of heat in the amount of X requires the same amount of electrical energy. In the translation, you said that it doesn’t matter what the stove is worth: a Dutch woman, a stove or a fireplace - the firewood will be needed the same way, which, of course, is absurd. For everyone has their own efficiency. An infrared heater has no more than 75% in the best samples.I was working on the issue of exporting one specialist from Belarus, since he achieved 68-69% and promised to raise it to 73%, which in 2004-2005 was simply unattainable in the West. In induction heaters, in theory, reached 170% in practice, we float from 130 to 160%. TEN - in fact hardly 90%. Accordingly, if 1500 W of thermal energy is needed, then 2000 W should be burned on an infrared emitter, 1666.666 on a heating element, and 1000 W on induction. Well, where is "the same, only a matter of time"?
  Sorry, you can only be trusted to turn nuts on the heating.
  
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  1. #24 Guest Anatoly Guests March 14, 2018 9:37 p.m.
    22
    
    With your calculations, you can safely apply for the Nobel Prize, the efficiency is 150%, with such an efficiency the premium is guaranteed by 150, no, by 200 percent, they will give just 2 for inventing the perpetual motion machine.
    Any heater converts all electrical energy into heat, which is removed from the heater by convection and infrared radiation, electromagnetic radiation is not taken into account due to the low voltage and frequency of the network, there are still losses on the supply wires, but they also heat the room. You can of course boil tea in your mouth while sitting on an electric stove, but why, but the priest will burn, and induction heating. Probably all manufacturers of heaters around the world are terrible morons, if you have not seized on this wonderful idea with an efficiency of 150%, or all the same, on the contrary. As heaters with low energy consumption and high heat output, the entire “moronic to your” world has been using heat pumps for a long time and successfully (air conditioning with heating function). A good air conditioner can produce up to 3.5-4 kW of heat per 1 kW of consumed electricity, and there is no miracle, just a physicist. Moreover, the efficiency of air conditioners is not more than 60-70%.
    
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    1. #25 Guest Igor Guests March 15, 2018 12:42
      8
      
      I completely agree with you. It seems that all the creators of boilers with an efficiency of more than 100% did not go to high school at all, or at least in physics they barely pulled a triple. The program is 9th grade.
      Made beautifully ... :)) But there is little sense ...
      
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    2. #26 Helge Guests March 19, 2018 16:20
      1
      
      You have taken the reference point incorrectly and begin to appeal to the Nobel Prize. Efficiency cannot be more than 100% in one system. Of the two logs, 4 can be made, but in the mass, the sum of the allocated energy, they are essentially identical. This is so, but you say that you can only bake one pie from one log, and those who manage to bake more are fools. At the same time, the example of heat pumps does not surprise you, but why? After all, there is an "impossible" efficiency !!! In general, first chew the porridge in your head before splashing out the speculations of the ignorant on the people and advising something
      
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      1. #27 Edos Guests March 24, 2018 18:08
        8
        
        You either did not study well at school, or you are trying to impress your point of view on those who did not study well at school. A heat pump does not turn electrical energy into heat. It spends electricity on the operation of the compressor and pump, and the heat energy is "removed" from the "carrier" of energy (air, water, earth ...)
        
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      2. #28 Guest Sergey Guests April 10, 2018 08:56
        1
        
        A heat pump is precisely a pump carrying thermal energy, and the medium’s boundary is the source of energy.
        
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    3. #29 altmax Guests March 19, 2018 19:26
      2
      
      Old counters poorly considered the energy consumption from induction heaters due to the nature of the load (it seems to be mostly reactive rather than active). Therefore, it turned out that with real 2 kW burned, the counter counted a little more than one. Modern counters do not care what the load is.
      
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      1. #30 Maksim Guests April 2, 2018 15:30
        2
        
        kW, which the home counter considers to be active, and the reactive kVAR set separate counters for it (now combine)
        
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  2. #31 Guest Yuri Guests March 22, 2018 06:09 a.m.
    2
    
    ohhh, these are the calculations. So in vain I spent 10 years of my life studying thermal processes and everything connected with them
    
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  3. #32 Edos Guests March 24, 2018 15:52
    2
    
    Tell the public with the formulas, in detail where does the thermal energy come from at least 1% more than the electrical energy is spent ??!
    
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  4. #33 Guest Alexander Guests July 12, 2019 19:53
    0
    
    Thanks you! For a long time I was looking for a practical independent answer in the cost of types of heat generators.Your answer leads me to the induction of practical data, at a comparative cost per unit of return. Thank!
    
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3. #34 Guest Sergey Guests March 14, 2018 13:35
  6
  
  Nobody canceled the Joule-Lenz law, the efficiency of any heater of a heating type is almost 100%.
  
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4. #35 Shurik Guests March 16, 2018 16:10
  3
  
  There is a difference in the method of accounting for email. energy. Inductive load is not correctly counted by the household meter if its cos will be noticeably different from the household load.
  For example, heat the transformer magnetic circuit.
  
  The second option to save is to heat the air conditioner, its 1 kW of heat is obtained from about 300W el. costs. The rest (700W) is obtained by cooling the air on the street. But unfortunately the usual air conditioning is up to -5C. And so it's just a heat pump).
  
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  1. #36 altmax Guests March 19, 2018 19:29
    3
    
    There are special low-temperature air conditioners that work up to -30. But if at +10 the efficiency of the heat pump is about 400%, then at -20 it is only 200, and by -30 it drops to 100%. And so a fairly effective solution, if not very cold outside.
    
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#37 Guest Nikolay Guests March 12, 2018 20:31
6

The coolest thing is the calculation of efficiency. I won’t even comment, although I have been heating for 20 years. This whole system or a miracle of nature, or garbage. Rather, the last.
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#38 Novel Guests March 12, 2018 21:04
3

1 kilowatt, you can’t heat 30 meters, if only to maintain the minimum positive temperature. It was necessary to study at school, to learn the law of "Thermodynamics".
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1. #39 Edos Guests March 24, 2018 18:17
  4
  
  30 squares can be different. You can’t heat a iron container with two kilowatts, and a house made of SIP panels (essentially a foam thermos) is easy. The question is that from 1 kilowatt of electricity you can’t get more than 1 kilowatt of thermal energy
  
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#40 Boris Guests March 12, 2018 9:54 p.m.
12

I liked most of all: "I calculated the approximate efficiency of the induction heater compared to the heater on the heating elements. And it turned out that the efficiency of the induction heater is 3.5 times higher than the heating heater."
It is very curious to look at the calculations of the EZOBRATEL, unfamiliar with the law of conservation of energy, but versed in electrical and heat engineering.
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#41 vladilir Guests March 12, 2018 10:20 PM
5

expensive. There is much more economical system. an example is an ion boiler
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#42 Guest Vladimir Guests March 12, 2018 10:54 p.m.
1

This tile heats only material with magnetic properties, and these corrugated tubes do not magnetize, I checked it several times, hell knows its effectiveness, but you can hardly win at a price, and why, you ask, is this fuss?
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#43 Guest Gennady Guests March 12, 2018 23:32
5

If your meter has counted 24 kWh of electricity per day, then according to the law of energy conservation it does not matter which heating element you use, 100% of the heat will remain in the house, apartment.
It makes sense to consider the efficiency if different types of boilers are used for heating on gas, coal, wood with a chimney, where about 30-60% of the heat flies. In the villages I met inefficient, sometimes home-made boilers from Soviet times.
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#44 Guest Vladimir Guests March 13, 2018 00:17
0

"The main criterion here is the efficiency of converting electrical energy into heat."
if the efficiency is low, then the losses will be thermal. And this is what we consume from Tena. There are no losses in the house. Outside the house, we do not consider losses.
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#45 vik Guests March 13, 2018 01:13
5

about efficiency complete nonsense at ten 100% and above only at the heat pump
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1. #46 Guest Sergey Guests March 14, 2018 1:41 p.m.
  4
  
  Efficiency cannot be more than 100% according to the law of conservation of energy. The heat pump as well. If we consider the cost of transferring heat from one medium to another, then this is not an efficiency. This is the same as calculating the efficiency of burning gasoline, and the costs are for pumping this gasoline with a gasoline pump. Efficiency will be gigantic))
  
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#47 Peter Vasilievich Guests March 13, 2018 07:13
8

The efficiency of a conventional heater is about 100%, since the electric current energy is converted into heat energy according to the Joule-Lenz law and only a small part of it is scattered in space by creating a magnetic field whose intensity is low, since the inductance of the TENA helix is insignificant.The craft is interesting, but before you talk about efficiency, learn the hardware!
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1. #48 Helge Guests March 14, 2018 09:54
  0
  
  Efficiency 100% only in theory
  
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#49 leonid Guests March 13, 2018 08:16
0

Well, this is practical, but an accurate calculation of heating is required here, so that there is no overheating of the circulating water system, otherwise it is dangerous. I have not a corrugated, but an ordinary tube with two turns of a spiral the size of a heater from solar gas. I use Solyarogaz with 2.5 square meters. Be sure to have a capacity of half and less than half filled with water supplying the water system of the radiator. The container protects against possible rupture, where the expansion exits through the always open hole. I have enough salt for one night it's 2n. from 8 pm to eight in the morning and still have time to boil tea. It is very hot at night for the room is only 3sq.m.
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#50 Miha Guests March 13, 2018 09:34
0

As for efficiency, of course, yes, it floods !!! And it’s so cool of course, for home-made ones, take your hands !!! And if instead of water to use antifreeze, household, also used instead of the coolant ?!
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#51 Helge Guests March 14, 2018 11:44
5

Yes, how dark and backward gentlemen are the critics.
1. The immutable rule of 1 kW per 10 m2 - complete nonsense. We have: 4 rooms. sq., 97.3 m2, consumption of 23 W / m2 of thermal energy in January 2017 according to the heat meter.
2. The efficiency of a thermal element based on resistance (mass electric boilers) is only 100% in theory. However, to achieve simply great efficiency, it is necessary that the heater does not turn off! But they don’t work in such a cycle, so you’ll lose every time you turn on transient heating processes. Bottom line: God forbid, get to the border of 86-87%.
What is there in the real world that is not made of cotton?
1. The required power in VT per m2 does not depend on "it always has been," but on the thermal resistance of the building / structure. Mass construction of 60-70 years from cinder block, brick has a limit of 2 units. For the Yekaterinburg zone, at least 3.5 units are needed. Very often, with an acceptable wall, I encounter errors in installing windows and doors - as a result of loss, and instead of the estimated 25 W in severe cold, we have 60 W of consumption per m2.
2. Who told you that from 1 kW of electric energy, only 1 kW of heat can be obtained? There is a Gigue and there is a Merce both ride at the same speed, a Gigat eats 10 liters, a Merce - 5 liters. The question is at Merc's efficiency of 200% or at Zhigi's 50% ??? In relation to induction: there are three schemes of "buildup" of the induction flow. In cheap tiles around 90%, in serious schemes 170%. The law of conservation of energy does not prohibit receiving work in the form of thermal energy in the amount of 1700 W (more correctly considered in Joules) by spending 1000 W of electrical energy. The people get confused in the name, they say, Watts are also Watts there, which means "cannot be" and forget that one fuel and the other is work, converted for convenience to the usual Watts.
3. The development of induction heaters has already reached the beta testing stage. Will be soon.
- To answer
1. #52 Alexey. Guests March 15, 2018 14:11
  2
  
  1 J = 1 kg · m² / s² = 1 N · m = 1 W · s. 1 kWh = 3 600 000 J.
  kW and kW * hour are two different things.
  
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2. #53 Sergey Ponomarev Guests March 17, 2018 07:16
  8
  
  According to claim 2 - what kind of nonsense? Justify with formulas, not guesses! What are the "transients" in the heater - active resistance, the value of which in the cold and heated state varies very slightly? Yes, indeed - in the "theory" the work on the purely active resistance of a circuit section of both direct and alternating current consists exclusively in the production of thermal energy, but let me curiosity: WHERE did you "practically" heat up almost 20% of this heat? Yes, you will not get rid of him with all your desire! And, if the transition of electric energy into heat, say, in a transformer or electric motor is an extremely harmful and undesirable phenomenon, then the task of the heating element is easy and simple, like a door - it is just to generate this very heat! That is, to fulfill Ohm's Law in its original form! And the electric efficiency of the heating element is in no way connected either with square meters, or with the materials of the walls, or with their thermal resistance, but only indicates how much of the electrical energy supplied to it was converted into thermal energy.And this is almost 99..100% for the heating element! But whether a system based on this heater will cope with heating is another question. This is already thermodynamics: if this system is able to inform the environment (heated room) per unit time of thermal energy more than this environment loses outside, it will cope, otherwise it won’t. A simple example: light the gas stove burner and leave it on for a day, while in the kitchen it will not become much warmer. Now we put a pot of water on the burner 10..20l or we put 2..3 bricks and heat - after an hour or two in the kitchen - Tashkent! But in the first and in the second case, it was the same burner, its power and efficiency during gas combustion were the same! But the thermal power, which greatly depends on the area of the surface radiating heat, as well as the thermal resistance and heat capacity of the media is already different, which led to the result! Therefore, you should not confuse the own efficiency of the electric heater and the entire heating system as a whole! Let TENA have its own efficiency of almost 100%, and the induction heater has only about 70..75, but if, for example, the heating system in the first case ensures the transfer to the environment of only half of the heat power generated by the TEN, and in the second - two-thirds , then we can safely say that induction heating was more efficient here and would cost the owner cheaper. But, if we consider the case when it is necessary to make a choice between an electric or induction boiler in a specifically existing system, then we can say that the efficiency of induction heating here is unlikely to be higher.
  
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  1. #54 Helge Guests March 19, 2018 16:33
    2
    
    Thank you for being - theorists from the scoop! Who drove you that all 100% of the energy supplied to the heating element based on resistance is released in the form of heat? This is not, therefore, there is no problem where "almost 20% of this heat has been drunk?" - it just WASN’T. The person correctly orientated you on the Rationalizer; TENs based on resistance never gave 100% efficiency. NEVER.
    Sorry sir, but I don’t owe you anything. You rested like a ram on the Watt plane and don’t taste what energy is for work, but what work is in the form of energy. As long as you theorize on the topic of "impossible", China is already doing this. But not from his own, but that he will be sent from Europe. And why is this not in Russia? Say thanks to your Persian Former. You don’t need to rattle a weapon of the mind much, and Siemens will sell you modern modules with two to you.
    Unlike you, I have a device at hand, and it works with the efficiency that is impossible for your awareness. I won’t spread the datasheets, otherwise Russia will immediately change me from boots to bast shoes.
    
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    1. #55 Guest Alexander Guests July 12, 2019 8:53 p.m.
      0
      
      So I give everyone an example of both China and the West ..
      While I had a welder more than 40 kg, the counter did not hold well and the plugs flew out, I could not transport it without a machine, and I torn my navel for transfer, dreamed of small apparatuses and cooked aluminum with a conventional welder. And all smart electronic engineers did not stagger their brains, and referred to smart formulas.
      But then the West surged, and China followed ... And the miracles began !!! And now the LED lamp gives about the same luminous flux, but takes 10 times less electricity. Welders are almost 20 times lighter !!! Now I have such an inverter 2.5 kg, it works with electrodes from 1 mm2 to 4 mm2 cross-section, and eats three times less electric energy. And I do not care about the laws of J. Lenz, or whatever else they are .. I got more economical, practical, profitable goods and tools. And that means it works, contrary to our clever and clever women from the 17th century !!! I personally need practical things that save my budget. And, by the way, in terms of heating and the power of these air heaters .. MONOPOLIES from the Government came up with those formulas that weren’t available in the Snab-sale system and Gosstroy of the USSR. Then the power of the paid heat energy was calculated and paid for by the power supplied to each section of the heating battery, which was also measured in Gcal. I worked in the supply chain and dealt with a range of over 10,000 products.And therefore, I’m just fooling about what is now considered not from the hot water flowing per unit of time, and the difference in the temperature loss at the inlet at the outlet, but they are calculated by kW per 1 m2 instead of 1 kW of one section of a cast-iron or aluminum battery, and refer to convection heat walls, ceilings, and other supporting structures. It seems that these carriers also generate heat, which also needs to be taken into account when using heat carrier. But not by the sensor on the section, and not by the volume of the passed coolant per unit time. Namely, these units should consider the cost of money for the production and return of this heat. But who will check this at the Government Level ?? He needs to collect more money from the population through the monopolies of Lukoil and other resources. Therefore, these counted calculation standards have been introduced to calculate payment from the population, which includes smart debaters. And therefore, wise men who consider who is on 1 m2, then on the induction of the walls .. please better be silent.
      This tena is the cost of the owner for heating when choosing a heater. She needs to be covered, and not to show knowledge of THEORY of the 17-19 centuries ...
      Look at the street, and at the Calendar. Now it is the 2nd dozen of the 21st Century. And the satellites are returning from Venus .. And you there, on the heating elements sit ... Well, sit. I choose induction heating and water heating. Pension tells me so.
      
      To answer
  2. #56 Guest Alexander Guests July 12, 2019 8:24 p.m.
    0
    
    if, for example, the heating system in the first case ensures the transfer to the environment of only half of the thermal power generated by the heating element, and in the second - two-thirds, then we can safely say that induction heating here was more efficient and cheaper for the owner.
    As a simple heat consumer, not knowing the smart laws of physics and other thermal degrees and the laws of heat, I choose exactly what is much more profitable, more economical and cheaper for heating my home with all other equal walls ... And you showed me that Induction option is more profitable and economical for me. Q.E.D. And let all the other clever men and experts choose their 10% TENs and give rubles to our voracious RESOURCES ...
    
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3. #57 altmax Guests March 19, 2018 19:33
  1
  
  according to claim 1 It is not necessary to compare an apartment, where only one wall faces the street, with a house where there is cold on all 4 sides, plus above and below.
  
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4. #58 ko4egar Guests March 26, 2018 09:42
  1
  
  All you wrote is very, very, very stupid. The article is not even so stupid. The tene's efficiency tends to unity, induction cannot exceed more than one, all losses somehow pour into heat, everything, the topic is closed. About firing and mercenary, yes, it turns out that in your example their efficiency differs by 2 times (ceteris paribus). Only he is far from a Mercedes 100, and at best 30.
  
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5. #59 Alexey Guests April 8, 2018 11:22 p.m.
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  “We have: 4 room square meters, 97.3 m2, consumption of 23 W / m2 of thermal energy in January 2017 according to the heat meter.”
  Add ALL electricity consumed here. You guess that all of it went to heat, even if it seemed that she was feeding the refrigerator (comp, etc.)?
  How many NOW did you get?
  
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#60 Guest Michael Guests March 15, 2018 11:50
0

30% of the electric current in nichrome simply flies by creating a current K.Z. and does not produce any work or heat! And ACADEMIC SCIENCE which cannot explain anything correctly, but only gives experimental coefficients, leave to academicians! link magazine inventor and rationalizer №8 2001
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1. #61 Sergey Ponomarev Guests March 17, 2018 06:26
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  "Flies ..." is a flock of files over Paris. And the current passing through the ACTIVE resistance of the conductor always does the work in this case - to heat it. The power (i.e., work per unit time) that will be allocated on a part of the alternating current circuit possessing a PREVIOUSLY active resistance, which is a heating element and which will go for its intended purpose - to heat water: Pa = U * I * cos ( f) Since the heater has a negligible component of reactance, we can assume that cos (f) = 1, i.e.Pa = U * I or that the efficiency of TENA, as a source of "generating" heat, approaches 100% (98..99%)! It is possible that another 2..3% reduction in the efficiency of both the electric heater itself (terminals or terminals for connecting the electric heater) and the electric boiler as a whole can be attributed to losses in the conductors, as well as the terminals, contacts and switching elements of the connection circuits. Total: the efficiency of the electric boiler-water heater should not be lower than 95..96%! What kind of "spans" of 30% of the current do you interpret here? The efficiency of an induction heater, all the more so "stuck together" from a Chinese induction furnace, can never even theoretically and in principle approach the efficiency of an electric heater, if only because you calculate how much power is dissipated on the switching element (IGBT) and the inductor itself ?! And what is the reactive component there at such frequencies? Ever wondered why this is in a one and a half to two kilowatt furnace (or rather a kilo-varn (B * A)!) There is always a fan that CONSTANTLY blows around the inductor and power circuits during operation? Yes, because of these one and a half declared “kilowatts”, only 150..250 W of ACTIVE power are dissipated only on the rectifier bridge and transistor! That is, almost a quarter of the energy supplied to the furnace will not go to heating water (coolant), but in the best case, to indirectly heat the room (basement, boiler room) where the unit is located. And if you take into account the considerable heating of the conductors of the inductor? That is - there we heat the water in the heating pipe, and here we have to work hard to cool the inductor and electronics, otherwise they simply fail, and therefore blow on them with a fan! And with all this, some authors here broadcast to us about 350% efficiency of induction heating in comparison with direct electric ?!
  
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  1. #62 Sergey Ponomarev Guests March 17, 2018 06:37
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    The only possible advantage of induction heating is the heating medium heating rate, since it is quite easy to create a large contact area between the heating medium and the heating element. Again: in the case of a heating element - it is completely immersed in the coolant and transfers heat to it almost completely, in this case only about 50% of the surface area of the heating element is in contact with the coolant, namely, the inner surface of the metal hose. Those. it is necessary to explain where almost half of the heat generated by the inductor disappears? Well, if not half, given the thermal conductivity between the metal-water and metal-air media, but still - again, tell tales of 350%? .
    
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#63 Shurik Guests March 16, 2018 16:04
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If you can use alteration in a domestic stove, then cos Fi - such a load will allow you to deceive e-mail. counter.
The household meter considers the active power and it takes into account the given cos.
If the load is inductive (or capacitive), then the counter will not count correctly - here you can save.
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#64 Sergey Ponomarev Guests March 17, 2018 05:41
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"I calculated the approximate efficiency of the induction heater compared to the heater on the heating elements. And it turned out that the efficiency of the induction heater is 3.5 times higher than the heating heater ...." - this is kapets, comrades! That is, you want to say that the efficiency of this miraculous "miracle" reaches almost 350% !!! ??? Let me ask you about your extremely "scientific" calculation method!
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1. #65 Guest Vadim Guests March 17, 2018 17:19
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  Because of such letter-eaters, we still have not mastered Mars, although we could. A person proposes a case that has already been proven by experience, and you gentlemen are bureaucrats ......... And not one of you has proved, on your fingers, that induction is worse. Did you take into account the heating area ?, academicians
  
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#66 Guest Nicholas Guests March 19, 2018 11:03
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I’m not going to argue on the topic of efficiency, I have two crock-pots, one heating stove, the other induction, I don’t see much difference, I checked each one when cooking the same dishes, I connected an electric meter separately. The induction heater heats up faster, that's probably all. more precisely, 2 kilowatens per month ate more, but on the scale of one kitchen it is not critical. The induction heating shown in the photo is what you want to have inI note two things that, in principle, put this idea to nonsense. 1. Induction tiles, like any other induction device, cannot work with materials that are not magnetized, but here a corrugated pipe made of non-ferrous metal or stainless steel, for induction it is all the same. 2.When heated, any liquid has a desire to expand, but there is no such possibility, which means that there will be no circulation or depressurization in a weak place. And how much one kW / h can heat, this is each writer himself. But the laws of physics on planet Earth works dissolved and this has to be considered.
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1. #67 Vadim Guests March 19, 2018 15:25
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  Good, you want to say that, in the video, the temperature sensor was heated separately? There is a stainless steel with magnetic properties. The idea is good, I will implement it.
  
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2. #68 Helge Guests March 19, 2018 16:05
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  You will not see much difference between the stoves, as in household inductions they do not use serious solutions - there is a simple one-key scheme. Accordingly, savings on the absence of inertia of heating and cooling, that is, a more complete utilization of the generated heat.
  
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  1. #69 Makhno Guests 16 january 2019 01:14
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    Savings on heating ambient air. The induction heater only heats the metal of the dishes themselves, an ordinary stove heats everything, air, dishes, comfort.
    
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#70 Helge Guests March 19, 2018 19:17
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I was thinking, it’s a little ugly, after all, to not put out specific data. Oil painting 1: heating the container, type Pan, with water up to 99 °, did not boil, since energy calculation will be more difficult to perform. The pan is not insulated, natural losses due to associated air heating by the pan itself. Anyone who wishes can calculate the number of heat losses due to air heating, t ° C of air 24 ° C. Heated with 15 kW induction emitter. As you can see, the time before boiling was 3 minutes. 10 sec

In oil painting 2: the heating time of the same volume of water without loss of air heating and the heating efficiency of 100% is 4 minutes. 46 sec

Well, gentlemen, theoretical know-it-alls, calculate how much thermal energy was generated on an induction radiator with a nominal radiation power of 15 kW, if the actual electricity consumption was ~ 14.5 kW?
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1. #71 Helge Guests March 20, 2018 14:13
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  Finally, I figured out a system like site.
  So, the picture of real measurements on induction heating is here:
  
  For those who want to calculate the loss of air heating, data: temperature 24 ° C, humidity 90%, a saucepan 500mm in diameter of the wok (cauldron translated) is covered with a lid.
  The standard water heater will heat the same volume of water for:
  The minimum efficiency is 120% of the consumed electricity. However, in fact, such emitters consume ~ 14.5 kW from the network, no more. There is nothing fabulous here, induction does not create heat, it “swings” the substance, heat is a by-product. Well, the resonance in the metal has not been canceled. All melting furnaces are resonant and working,
  that is, they monitor the frequency of radiation - there is no such function in household tiles. Well, induction do not care what metal to heat up - the question is in frequencies. But magnetizing metals, of course, are simpler and more cost-effective.
  
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  1. #72 aleks2468 Guests March 25, 2018 17:45
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    An inductor heats 80% of the pan’s displacement (10.96 liters), and with a ten, all 100% (13.7 liters) spent 0.95603 kWh with an inductor and 1.195 kWh with a ten, respectively - 20% difference (100 % -80% = 20; by heating displacement)))))
    Oil painting - an elementary scam with the volume of the heated body))))
    
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    1. #73 Helge Guests March 29, 2018 08:30
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      In the last public fix, it costs exactly 10.96 as in induction. Still, induction is NOT EQUAL to ten
      
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#74 Guest Yuri Guests March 19, 2018 19:17
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At times higher efficiency - at the heat pump. All other reasoning is heresy!
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1. #75 Vadim Guests March 19, 2018 20:59
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  Good. And if we take in the aggregate: ease of manufacture, cost of components, ease of maintenance, availability. Which project will win?
  
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  1. #76 Helge Guests March 20, 2018 09:33
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    I know for Germany - there, at the state level, subsidies for the installation of "ground pumps", the literal translation of Grundpumpe. The heat pump due to the heat of the earth, well, all the difficulties of installation are associated with earthworks. I don’t remember the price already, but not childishly, that's why they subsidize.True, it pays off over time.
    
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  2. #77 Helge Guests March 20, 2018 09:39
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    I’m in practice: for 5 years, prices for design work on gasification have only increased. Today, the gas project eats up all possible profits from its use for 30-40 years ahead. Unless, of course, at the local government level it is not subsidized.
    
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2. #78 Helge Guests March 20, 2018 09:25
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  Try to heat up with a heat pump at temperatures below -15 ° C
  
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  1. #79 Vadim Guests March 20, 2018 2:47 p.m.
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    This is what I am leading to. Given: summer cottage 45sq.m., visit from spring to frost, a single room 25sq.m, gas supply but refuse to connect until the heating is complete. I want to make temporary heating, so to speak gradually. A heat pump with installation costs about 400,000 rubles (the cheapest), can it still be an induction hob? BUT?
    
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    1. #80 Helge Guests March 29, 2018 09:19
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      The tile is not very: their efficiency nevertheless leaves much to be desired. Plus, Chinese is Chinese, not branded, scary to leave unattended. Well, all brains are stitched to shut off after 4 hours. I solve the issue of the controller, in the lineup there will be 3, 5 kW heaters for 220, and up to 100 kW for three-phase power. The price tag is approximately 30 kilo rubles. In the series, the price is unlikely to change significantly.
      
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#81 alikisay Guests March 23, 2018 19:37
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heat loss depends on the surface area through which heat is removed. In apartment buildings, these are mainly walls, windows. Significant heat loss is provided by ventilation.
So, if the apartment has well-insulated walls and windows of the 3rd double-glazed window with a layer reflective in the IR range, then a power of 1 kW will be enough. However, in real life, most Soviet-made apartments, and many houses built in Russia already, do not differ much in heat loss. Plus dependent psychology. When they go to the porch to smoke, and then open a window in the porch in winter so that the tobacco stench is not pulled into the hut. When the regulator is not put on the battery, it costs money, and there will be windows and window openings in the spring. It is impossible to collect money from people for facade insulation (the state must), but please pay annually half of this amount for heating.
As for induction heating. It is difficult to understand the purpose of the presented scheme. What is the difference between the heat of a simple heater and this "space ship" is decidedly impossible. Probably the device changes the heat capacity of the surrounding air and household objects in the direction of reduction (gravity distorts the space-time continuum). And therefore, for the same loss of electricity, they can be heated by a greater number of degrees.
IMHO Fomenkovschina.
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1. #82 Guest Nikolay Guests March 27, 2018 05:02
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  Not respect for the opponent in the dispute leads to a house, and the truth remains unfulfilled. Each of you operates on an old school of physical phenomena and does not want to look into new open or unexplored energy phenomena of the world.
  Measurement methods are becoming obsolete, as are laws that require amendment and change.
  The phenomena of heat and heat transfer to the crane have not been studied and are being built on laboratory practice.
  Be polite and cultured in your conclusions and treat others like yourself so as not to be considered a charlatan in the future.
  
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2. #83 Helge Guests March 29, 2018 09:22
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  Heat loss depends on the area and on HEAT CONDUCTIVITY / HEAT RESISTANCE of the walls. Ventilation, if not a draft, does not give a significant loss.
  
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#84 bean Guests March 26, 2018 00:36
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heels of another powerful computer loaded with demanding tasks, it’s possible that mining is warm and the efficiency will not disappear
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#85 Gregory Guests April 3, 2018 18:21
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You made a trolley from a loaf of bread. Efficiency of a heating element, soldering iron, lamp and other things - 100%. This is an active load, it actively converts energy (in this case, electrical) into heat, and we need it. It doesn’t produce anything else - the usual Joule-Lenz law. And such an installation with induction is more complicated, unreliable, more expensive and its efficiency, by the way, will be lower than a conventional heating element, because part of the energy (although probably insignificant) will disappear in the form of electromagnetic waves.
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1. #86 Helge Guests April 9, 2018 08:42
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  Enlighten, why does the lamp have an efficiency of 100%, by glow or heating? For you, the fools of the backward world are inventing all kinds of garbage, but you just need to turn on the light and it will be immediately warm ... Similarly, using a soldering iron, give a model with an efficiency of 100%, we will sell it abroad, otherwise they don’t have such ...
  
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#87 Vasya Guests April 9, 2018 16:24
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I read the comments and everyone is arguing about efficiency, but I have a different question. Judging by the photo from the radiator, a corrugated stainless steel pipe is connected, I have not seen others in stores either. In short, this circuit is not 100% working since the induction cooker works only with magnetic material, tobish iron, cast iron, etc. So how does the sowing system work for him? That’s all garbage.
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1. #88 Guest Alexander Guests July 12, 2019 9:26 p.m.
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  Now such corrugations all rust. Cast-iron frying pans and other dishes that never rusted, "Made in Lysva" (!!!) They also rust! Fake !!! China-China .. It is quite likely that there may be impurities in the corrugation ... Although it is also impossible to 100% believe in this example. We can’t feel this warmth while reading ..
  
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#89 Robert Guests April 10, 2018 08:33
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What is this nonsense written here? The conversion of electricity to heat has one calculation formula Q = I2 * R * t, where I is the current in the circuit, R is the load resistance, t is the operating time. Efficiency with any method of conversion from email. energy to heat 100%. The difference in safety, resource, convenience, price, comfort, dimensions.
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1. #90 Helge Guests April 23, 2018 15:21
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  Except nichrome do not know? Well, for a microwave how to count by this formula, can you give an example of calculation?
  
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#91 Michael Guests July 11, 2018 9:12 p.m.
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it’s time for all local thermal academics to go to elementary classes, then to teach physics .... then you can speculate about the effectiveness of the heater.
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#92 RuslanME Visitors September 11, 2018 10:06
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On YouTube, I saw a hundred years ago how a man just put such an induction furnace right behind a radiator suspended in the bathroom =)
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#93 Guest Alex Guests October 18, 2018 18:26
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It was worth so much to get hungry, Kulibin dear. They would study physics in the 8th grade, would not get lost in the very initial message of their invention. In fact, I am amazed how a person who extracts heat from electricity in such an intricate way does not know that the efficiency of any converter of electricity to heat in a closed volume of 100%. Karl - 100% (even if the converter has mechanical moving elements). Do not confuse with heat pumps (refrigerators, air conditioners) since they do not work in a closed volume (system).
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#94 Guest Oleg Guests October 21, 2018 2:50 p.m.
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and the pipe of which company ..lavita..they are different which ones are magnetized which are not, not all will go only magnetic
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#95 Yuri Guests November 1, 2018 11:24
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This is not direct induction heating, in this case we have a transformer with a short-circuited secondary winding (it will not work without a jumper).
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1. #96 Yuri Guests November 2, 2018 09:19
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  In this case, the magnetic properties of the metal do not matter.
  
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#97 Kirill Guests December 19, 2018 20:11
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The heater has an efficiency of about 100%, so you have 350%? Thumbs up, thumbs up.
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#98 Kirill Guests December 19, 2018 20:29
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An electric heater, even a convector, even IR, in a confined space will convert all the energy into heat (except that sound and EMP will break free))). But IR will warm the fence / objects, and the convector will be air, so the temperature comfort in the room will vary.
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#99 alexander1 Guests January 25, 2019 8:36 p.m.
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“Heating systems are designed to compensate for heat losses in residential and industrial premises”, something like this is defined by SNIP. Heat losses are directly proportional to the temperature difference, both indoors and out, and inversely proportional to the quality of thermal insulation. Having been engaged in heating for a long time, I can say that there are houses, which are 2 kW. on 10 sq.m. few, but there are those as 0.5 kW. on 10Q more than enough. You need to understand that we are talking specifically about thermal energy, but its generation from another type of energy and conversion efficiency: a particular decision issue in a particular case. As for the efficiency different devices, I think that with electric heaters it is really 100%.Losses occur only on power wires outside the premises, which, with proper installation, can be neglected. Heat pumps are more efficient, but it’s a miracle only if we consider a specific room as a closed heating system, which many do, getting efficiency above 100%. But the heat pump takes away heat from the external environment, water, air, soil, which receives heat from sources outside the room, hence the "Nobel" efficiency. If we consider the entire planet as a closed thermal system, which in this case is permissible , then everything becomes understandable, that is, your house is heated by the sun or the earth itself due to internal heat. All other types of heaters have an efficiency of 95% and lower.
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#100 the guest Guests January 31, 2019 18:05
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Efficiency of induction heater - marketing scam. Think for yourself: at least losses on the converter and losses on the coil. While a conventional heating element has an efficiency close to 100%, because even losses on it go into heat
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#101 Andryukha 2 Guests March 12, 2019 3:25 p.m.
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I will say more than 500 watts of underfloor heating, heats a room faster than a 2000 watts iron. The law of conservation of energy is respected. Just the floor will be 50 degrees Celsius (and air 30), and the iron 500 degrees (and air 15). But the area of contact with the heated air in the room is orders of magnitude different ....
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#102 Yurii dolgarev Guests March 20, 2019 12:37
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100% cannot be, for a simple reason - losses in wires, contacts (automatic), transient resistances in the connections and as a result, heat is released in the shield at the entrance, and not at your home. The wires also have resistance to your home. Losses on conversion and repeated in transformers, too, no one has canceled.
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#103 Guest Sasha Guests May 13, 2019 2:44 p.m.
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If the design is indeed working, the author is well done! Skeptics were always surprised in the comments, except for their own. And they didn’t hold anything in their hands, but they clearly knew the laws of thermodynamics XD
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