Requirements for the thickness of the boiler insulation layer, fire-resistant layer, and insulation foam
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What thickness is required for the refractory layer and insulation layer on the outer surface of the boiler at 50°C?
Find a textbook to look at; it has information on it
If the boiler isn’t too large, and there is no need to distinguish between the temperatures of the front and back walls, then the heat transfer principles learned in school are sufficient. If that’s not enough, then one can look into the principles and calculations related to boilers; it’s something along those lines, and relevant information can be found there.
The approximate thickness can be determined with reference to heat transfer principles; however, the actual value also depends on the internal and external environments. It is best to consult a supplier of insulation materials for advice