Above 1400 F heat transfer by radiation is greater than by convection, During radiative heat transfer, energy is transmitted from a refractory wall at higher temperature than the metal part to be heated. Generally the emissivity of the refractory is less than 0.8. NASA has developed high emissivity coatings which has emissivity of 0.9. Some coatings formulations are now available to coat the refractory walls and reduce fuel consumption. We plan to apply this coating in a steel reheating furnace, and would like to know if others have used such coatings, the precautions to be taken, and the percent reduction in energy consumption.
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