On the heat density of electric heaters and their safety. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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On the heat density of electric heaters and their safety. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

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Some people use homemade electric stoves and constantly repair them. This article reminds you how to solve the problem once and for all.

In [1], the author shared a simple method to significantly increase the reliability of electric heaters (HEs) by reducing their temperature. Moreover, the amount of heat generated by such spirals remained unchanged. But then a publication [2] appeared, where the author, agreeing that "... four identical EN can be turned on so that they will be equivalent to one in resistance, and hence in power ...", nevertheless expresses three opinions with which it is difficult to agree.

Firstly, "... The reliability of such a battery increases several times ...". Why only a few, and not an order of magnitude? Back in the early 80s. In the 2th century, the Dutch physical chemist Jacob Hendrik van't Hoff showed that the rate of most chemical reactions increases by a factor of 4–10 with every 3°C rise in temperature [4]. Already in [4], it was mathematically proven that the absolute temperature of a battery of 1,75 spirals will decrease by 4 times. In the example considered in [600], this decrease was XNUMX°C, which means that the reliability of the combined coil will increase not by several times, but by several orders of magnitude.

Secondly, the controversial thesis in [2] is the statement that "... in an electric stove, there will be little benefit from such an inclusion ...". Especially to test this opinion, I purchased four spirals and gave them a test. The spirals were included as shown in the picture.

On the heat density of electric heaters and their safety

They heated up more slowly, but quickly warmed up the stone of the electric stove and everything that was on it. Food cooked on such an electric stove was tastier: the fat did not burn out, the potatoes were well fried to a golden crust, and unleavened bread baked on a Teflon pan was of excellent quality. By the way, the villagers in their stoves deliberately push the heat to the infrared and even the invisible region of the spectrum - this is a folk experience. They try to cook food not in the flame, but in the heat, and bread is baked not in the heat, but in an empty oven after the complete unloading of all the fuel and its combustion products (ash).

Thirdly, the controversial thesis is the assertion that the cost of the combined spiral "...increases by 4 times ...". You can buy only two spirals with 4 times more power or one, the length and section of which is 2 times greater than the old one. You can also buy the cheapest coils of poor quality or bargain for a reasonable price. If you use EN long enough, then the enlarged coil will cost not more, but cheaper, since it will never have to be changed.

Why is such a simple idea not implemented? Yes, because love for one's neighbor is still weaker than love for money, and for a long time manufacturers will do everything so that we spend our money more often, and not save.

References:

Bearded Yu. Eternal spiral//Electrician. - 2001. - No. 6. - P.23.
Zyzyuk A.G. On the supply of heating elements with direct current ... and not only about this / / Elektrik. - 2002. - No. 7. S.10-11.
Encyclopedic Dictionary of a Young Chemist. - M.: Pedagogy, 1982.
On the temperature of electric heaters and the possibility of its reduction // Electrician. 2001. - No. 6. - p.27.

Author: Y. Bearded

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