Interpretation of far infrared electric heater
Interpretation of far-infrared electric heater from a physical point of view
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I. The nature of far infrared electric heater
The wavelength in the spectrum from 0.76 to 400 microns is called infrared, and infrared is invisible light. All substances above absolute zero (-273°C) can generate infrared rays. Modern physics calls it heat rays.
Infrared can be divided into two categories: near infrared and far infrared. Near-infrared or short-wave infrared, with a wavelength of 0.76 to 1.5 microns, penetrates deeply into the human body, about 5 to 10 mm; far-infrared or long-wave infrared, with a wavelength of 1.5 to 400 microns, is mostly absorbed by the surface skin, and the penetration depth is less than 2 mm.
II. Physical characteristics of far infrared electric heater
1. Has thermal effect; 2. Strong ability to penetrate clouds and fog (longer wavelength, easy to diffract)
III. Features of far infrared electric heater
1. The infrared characteristics (wavelength) emitted by objects with different characteristics are different. Infrared with different characteristics is easily accepted by objects with the same characteristics-that is, the infrared emitted by solid materials is easily absorbed by solids and not easily absorbed by gases.
2. The way of heat transfer: radiation, conduction, convection.
3. The heat energy of the far-infrared electric heater is mainly transmitted in the form of radiation at high temperature (90%), and its radiation intensity is proportional to the fourth power of temperature.
4. The absorption capacity of radiant heat energy is proportional to the blackness of the surface of the heated object.
5. Using far infrared electric heater, the heat conduction intensity of the heated object is proportional to the temperature gradient (outside and inside of the object) and inversely proportional to the thermal resistance.
