Simple induction heating

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

What do you need for an induction heater?

Induction household hob. It is not that expensive and has a power consumption of about 1 kW.
Radiator. I took the bimetallic one. The number of sections depends on the area you need to heat.
Metal corrugated hose - can be purchased at any plumbing store. You will need 1.5 meters with a margin.
Fitting and couplings for connecting the pipe to the radiator.
A piece of copper tube to complete the circuit.

Radiator and tiles:
Any induction cooker has a power control, which can be used to regulate the heating temperature of the radiator.

Corrugated pipe - water supply:

We bend the tube like a snail or a spiral. It bends easily with your hands.The area of the snail circle should be larger than the circular heating surface on the tile.

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

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

We screw the circuit to the battery.

We place a tile under the curl.

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

I calculated the approximate efficiency of an induction heater compared to a heater using heating elements. And it turned out that the efficiency of an induction heater is 3.5 times higher than that of a heating element heater.

Watch the video

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

Assembly of the boiler itself.

Choosing an induction cooker. Finalization.

Automation connection.

Testing in a water heating system.

come back

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Comments (110)

#1 nigrigos59 Guests 12 March 2018 14:05
29

there is an immutable rule - for 10 square meters of area 1 kW of power, everything else is from the evil one
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1. #2 Novel Guests 12 March 2018 18:05
  4
  
  This is with strong heat loss. On average 50-70 watts per square meter with a ceiling height of no more than 3 meters
  
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2. #3 Guest Nikolay Guests 12 March 2018 20:37
  4
  
  Not quite right. I personally tested a certain vapor-drip heater for 2 days. I hung it with counters, thermometers, volt and ammeters. Honestly, I didn't think there would be any effect. Oddly enough, I got 10-15% less consumption than a mycothermal convector. Maybe I didn’t take something into account, although I tried very hard.
  
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3. #4 Guest Vasily Guests March 14, 2018 09:45
  6
  
  Your immutable rule is complete nonsense. 4-room sq. 97.3 m2, for January 3017, thermal energy consumption according to the IPU amounted to 1.4376 Gcal, which is equal to 1,671.929 kW. We divide kW by 31 days, by 24 hours, by the area of the apartment, we get 23.0957 W. In the apartment +20...+21. House from 1959, thermal resistance about 2 units
  
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  1. #5 Edos Guests 24 March 2018 15:37
    5
    
    CHiP was calculated based on the average daily temperature -25 degrees!!! and for houses as a whole, heat loss from the roof, MOPs, etc. was included here.
    
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  2. #6 Guest Andrey Guests 9 April 2018 10:35
    13
    
    So that’s the technology of 3017!
    
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4. #7 guest Guests 19 March 2018 14:04
  2
  
  Correct, but this rule applies to solid fuel boilers, and for electric boilers it has a completely different meaning. it is 1 kW per 18 m/2
  
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#8 Guest Vladimir Guests 12 March 2018 19:06
28

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
  1
  
  Where does this 2% go?
  
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2. #10 Guest Vasily Guests 14 March 2018 09:49
  5
  
  Wow, 98%!!! Wow, they could do it, give them a manufacturer of heating elements that has such efficiency. I haven’t seen more than a real 86% for passive heating elements yet
  
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  1. #11 Guest Sergey Guests 14 March 2018 13:33
    7
    
    Sorry, can you tell me where the remaining 14% goes?
    
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    1. #12 altmax Guests 19 March 2018 19:12
      15
      
      They turn into heat. 86% go to heating water, and 14 simply heat water)))
      
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      1. #13 Edos Guests 24 March 2018 15:45
        16
        
        86% for heating water, and 14% heats the water!!!))))) this is SUPER!!! Isn't your last name Klitschko?
        
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  2. #14 Dmitriy Guests 15 March 2018 22:10
    19
    
    The efficiency of the heating element is 0% since it does not produce work, and all the energy turns into heat. But since we need heating elements to produce heat, the efficiency (in terms of thermal energy) is 100%. And the efficiency cannot be greater than that of a heating element.
    
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    1. #15 Georgy Vitalievich Guests 4 April 2018 18:44
      1
      
      Yours took..!
      
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  3. #16 Vania Guests 30 March 2018 20:14
    1
    
    in the electrical circuit the power source-heating element (active consumer 100%) where can there be losses????
    
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    1. #17 Igor Albertovich Guests 15 October 2018 22:01
      1
      
      Not all of the current energy in the heating element turns into heat. When heated, bodies expand. At least that way!
      
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3. #18 Zheka Guests 21 March 2018 21:03
  6
  
  And the rest is a vortex magnetic field that heats the surrounding conductors and generates ultra-long radio waves. So, taking this into account, almost 100%.
  PS Even the heating of a low-quality socket and poor electrical wiring is not wasted - it warms the room.
  
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  1. #19 Alexander Guests 8 April 2018 18:23
    3
    
    Even the heating of a low-quality socket and poor electrical wiring
    is not wasted.
    
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4. #20 Guest Alexander Guests 12 July 2019 19:43
  2
  
  Laughter on the Christmas tree!!! Here the costs are 98% - yes. And in general, all heating elements are a thing of the past. BUT becauseThese heaters are the simplest to manufacture and practical to use; it is still difficult to abandon them. But it wastes energy mercilessly!!!
  
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#21 deficit21 Guests 12 March 2018 19:24
92

I have been in the heating and plumbing business for almost twenty years. But this is the first time I’ve seen such crazy nonsense!!! The author probably imagines himself as a modern-day Albert Einstein of level 80. It is absolutely true that for 10 square meters of area there is 1 kW of power, and therefore, no matter what the boiler or heating element is, the electricity will be spent the SAME be it heating element, induction, infrared, etc. Heating time difference. And in this case, it is cheaper to buy one radiator: an infrared electric convector or an oil radiator. This homemade 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
  20
  
  +100%. I agree - another stupidity.
  
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2. #23 Helge Guests 14 March 2018 13:10
  17
  
  You are absolutely wrong. If you take a certain structure, then with a static external heat-absorbing environment, for example, 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 to generate X amount of heat, the same amount of electrical energy is needed. In the translation, you said that it doesn’t matter what kind of stove it is: a Dutch stove, a potbelly stove or a fireplace - the firewood will be needed the same, which, of course, is absurd. Because everyone has their own efficiency. The 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, we reached 170%; in practice, we float from 130 to 160%.Heating element - in fact, barely 90%. Accordingly, if you need 1500 watts of thermal energy, then you need to burn 2000 watts on an infrared emitter, 1666.666 on a heating element, and 1000 watts on induction. Well, where is “the same, it’s just a matter of time”?
  Sorry, but you can only be trusted to turn the nuts when it comes to heating.
  
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  1. #24 Guest Anatoly Guests 14 March 2018 21:37
    27
    
    With your calculations, you can safely apply for the Nobel Prize, the efficiency is 150%, with such an efficiency the prize is guaranteed by 150, no, by 200 percent, they will give 2 at once for the invention of a 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, it will burn your butt, can also be done with induction heating. Probably all heater manufacturers around the world are terrible morons if they did not seize on this wonderful idea with an efficiency of 150%, or vice versa. As heaters with low energy consumption and high heat output, the entire “moronic” world has been using heat pumps (air conditioning with heating function) for a long time and successfully. For 1 kW of consumed electricity, a good air conditioner can produce up to 3.5-4 kW of heat, and there is no miracle, just physics. Moreover, the efficiency of air conditioners is no more than 60-70%.
    
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    1. #25 Guest Igor Guests 15 March 2018 12:42
      10
      
      I completely agree with you. It seems that all the creators of boilers with an efficiency of more than 100% did not study at all in high school, or at least barely got a C in physics. 9th grade program.
      Made beautifully... :)) But it's of little use...
      
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    2. #26 Helge Guests 19 March 2018 16:20
      1
      
      You took the wrong starting point and are starting to appeal to the Nobel Prize. Efficiency cannot be more than 100% in one system. You can make 4 out of two logs, but in terms of mass, the amount of energy released, they are identical. This is true, but you claim that only one pie can be baked from one log, and those who manage to bake more are fools. At the same time, you are not surprised by the example with heat pumps, but why? After all, there is “impossible” efficiency!!! In general, first chew the porridge in your head before splashing out on the people the conjectures of an ignoramus and advising something
      
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      1. #27 Edos Guests 24 March 2018 18:08
        8
        
        You either did not study well at school, or you are trying to instill your point of view in those who did not study well at school. A heat pump does not convert electrical energy into heat. It spends electricity on the operation of the compressor and pump, and heat energy is “removed” from the energy “carrier” (air, water, earth...)
        
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      2. #28 Guest Sergey Guests 10 April 2018 08:56
        1
        
        A heat pump is precisely a pump that transfers thermal energy, and the source of energy is the boundary of the media.
        
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    3. #29 altmax Guests 19 March 2018 19:26
      2
      
      Old meters did not calculate energy consumption from induction heaters well due to the nature of the load (it seems to be mostly reactive, not active). That’s why it turned out that with 2 kW actually burned, the meter counted a little more than one. Modern meters don’t care what the load is.
      
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      1. #30 Maksim Guests 2 April 2018 15:30
        3
        
        kW, which is what the home meter counts and is active, and reactive kVAR, separate meters were installed for it (now they are combined)
        
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  2. #31 Guest Yuri Guests March 22, 2018 06:09
    2
    
    oooh, these are the calculations.This means I wasted 10 years of my life studying thermal processes and everything connected with them.
    
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  3. #32 Edos Guests 24 March 2018 15:52
    2
    
    Tell the public with formulas, in detail where the thermal energy comes from at least 1% more than the electrical energy expended??!
    
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  4. #33 Guest Alexander Guests 12 July 2019 19:53
    1
    
    Thank you! I have been looking for a long time for a practical independent answer to the costs of types of heat generators. Your answer inclines me precisely to the inductive one from practical data, based on comparative costs per unit of output. Thank you!
    
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3. #34 Guest Sergey Guests 14 March 2018 13:35
  6
  
  The Joule-Lenz law has not been canceled; the efficiency of any heating element type heater is almost 100%.
  
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4. #35 Shurik Guests 16 March 2018 16:10
  3
  
  The difference is in the method of accounting for email. energy. An inductive load is not counted correctly by a household meter if its cos is noticeably different from the household load.
  For example, heating with the magnetic core of a transformer.
  
  The second option to save money is to heat it with an air conditioner; 1 kW of heat is obtained from approximately 300 W of electricity. costs. The rest (700W) is obtained by cooling the air outside. But unfortunately, regular air conditioning is down to -5C. Otherwise it’s just a heat pump).
  
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  1. #36 altmax Guests 19 March 2018 19:29
    3
    
    There are special low-temperature air conditioners that operate down 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%. This is a fairly effective solution, if it’s not too cold outside.
    
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5. #37 Bunker Mummy Guests 13 March 2023 12:53
  0
  
  Man, 1 kW per 10 meters is not a dogma, but just the old Soviet norm for heat loss in premises according to Soviet SNIMs (100 W per meter). European standards are much stricter - 40W per meter.In other words, 0.4 kW per 10 meters. There are also more stringent ones - 20W per meter.
  
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#38 Guest Nikolay Guests 12 March 2018 20:31
7

The coolest thing is calculating efficiency. I won’t even comment, although I’ve been doing heating for 20 years now. This whole system is either a miracle of nature or bullshit. More likely the latter.
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#39 Novel Guests 12 March 2018 21:04
4

1 kilowatt, 30 meters cannot be heated if you only maintain a minimum positive temperature. It was necessary to study at school, learn the law of “Thermodynamics”.
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1. #40 Edos Guests 24 March 2018 18:17
  7
  
  30 square meters can be different. You can’t heat an iron container with two kilowatts, but a house made of SIP panels (essentially a foam thermos) can easily. The question here is that you can’t get more than 1 kilowatt of thermal energy from 1 kilowatt of electricity
  
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#41 Boris Guests 12 March 2018 21:54
14

What I liked most was: “I calculated the approximate efficiency of an induction heater compared to a heater using heating elements. And it turned out that the efficiency of an induction heater is 3.5 times higher than that of a heating element heater.”
It is very interesting to look at the calculations of the ESOBRITER, who is unfamiliar with the law of conservation of energy, but understands electrical and thermal engineering.
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#42 Vladilir Guests 12 March 2018 22:20
5

expensive. There are much more economical systems. example - ion boiler
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#43 Guest Vladimir Guests 12 March 2018 22:54
3

This tile only heats material that has magnetic properties, and these corrugated tubes do not magnetize, I have tested them several times for efficiency. fig knows him, but for the price you are unlikely to win and why, one might ask, all this fuss?
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#44 Guest Gennady Guests 12 March 2018 23:32
6

If your meter has counted 24 kWh of electricity per day, then according to the law of conservation of energy, it does not matter what heating element you use, 100% of the heat will remain in the house or apartment.
It makes sense to consider efficiency if different brands of gas, coal, or wood boilers with a chimney are used for heating, where approximately 30-60% of the heat flies away. In villages I came across inefficient, sometimes homemade boilers from Soviet times.
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#45 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 there will be thermal losses. And this is what we consume from TEN. There are no losses in the house. We do not consider losses outside the house.
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