What Is Terrestrial Radiation?

Ground radiation is the way in which the surface of the ground emits radiation day and night with its own heat. Because the surface temperature is much lower than the sun (the average surface temperature is about 300K) , the main energy of ground radiation is concentrated between 1 and 30 microns, and the average maximum wavelength of radiation is 10 microns, which belongs to the infrared range and is in the same range Compared with short-wave radiation, it is called ground long-wave radiation. ^[1]

Ground radiation

Earth's surface is absorbing

Floor heating system with heating cables. The heating cable is used as a heating element, which is emitted after being energized.

Advantages of using electric radiation heating. Williams H. Carrier of the United States proposed the famous "heating effect" to evaluate the heating rate. That is, the higher the proportion of heat input into the use area in the total input heat, the better the heating effect and the more efficient the heating. high. The thermoelectric efficiency of radiant heating is as high as 98% or more, about 60% of which transmits energy in the form of electromagnetic waves, radiating a large amount of infrared rays, and the heating structure of the envelope structure directly heats the surface without heating the air. The temperature is also particularly good, and the temperature gradient is 2 3 lower than that of convection heating, which greatly reduces the heat loss transmitted by temperature difference. This energy-saving heating method has been recognized by countries around the world and is included in energy-saving design standards. ^[3]