Radiation and thermal efficiency of radiation-type heaters on heated objects (Teitokusha Column)

Basic knowledge about the thermal efficiency of radiation and radiation-type heaters on heated objects.

Since its founding over 130 years ago, the company has spent about 100 years as a refractory manufacturer and has ventured into the electric heater industry in the last 30 years. We have been committed to responding to the wishes and requests of customers in various industries and focusing on the development of new products based on new technology. That is why we provide useful knowledge about heaters. <Radiation> Heat transmitted by electromagnetic waves. No material is needed to conduct heat. The energy intensity increases in proportion to the fourth power of absolute temperature. The effectiveness of radiators (mainly heating elements) is significant at temperatures above 800°C. <Heat efficiency of radiation-type heaters to heated objects> ■ The wavelength of radiant heat is determined by the temperature of the heating element. Example: 1000°C (1273K) peak wavelength 2.3μm. Black body (perfect) > absorbs all incident energy. White body (perfect) > reflects all incident energy. Transparent body (perfect) > transmits all incident energy. ■ The absorption, reflection, and transmission characteristics are determined by the material (strong wavelength dependence). General materials > Absorption rate: varies with surface condition (mirror finish, surface roughness, oxidation level) / Transmission rate: usually considered to be zero. Materials like glass > Absorption rate: varies significantly with wavelength / Transmission rate: mostly transmits. *For more details, please contact us or download the PDF.

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