High emissivity coatings for furnaces

[Ramkiyengar]

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.

 

[IRstuff]

Please refrain from double posting.

Note that a high emissivity means that it will absorb all the radiated emission, and only emit a lower temperature version of what came in.

TTFN
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[tbuelna]

This might be what you are looking for. Of course, I don't know how well this coating would last in a commercial furnace that operates continuously for long periods of time.

 

[Ramkiyengar]

Thank you tbuelna, I am already in contact with the manufacturer of this product. It appears there are few engineers in this Forum who are from the rust belt and who operate industrial furnaces. I am trying to get information if anyone has used high emissivity coating in industrial furnaces and seen a measurable change in energy consumption. With so many factors affecting energy consumption in an industrial furnace, one would need an algorithm based on statistical analysis or a higher data analytics to see the trees from the woods, that is identify the incremental contribution of high emissivity coating from other factors.