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# insulation thickness needed for boiler furnace

## insulation thickness needed for boiler furnace

(OP)

I want to insulate a boiler furnace, with certain layers of ceramic and rock wool. I was told that suppliers have equations that I can use to calculate what the outside temperature would be, given a certain inside temp and the properties of the wool used. However I cannot find any.

Kindly reference me to any such sources. I am not looking for conduction and thermal resistance type of equations.

### RE: insulation thickness needed for boiler furnace

And, er, why are you NOT looking for conductance and resistance type equations?
Do you think there are other, more useful equations available?

### RE: insulation thickness needed for boiler furnace

You can try to get a first rough estimate with http://www.rockassist.com/

### RE: insulation thickness needed for boiler furnace

(OP)
Because if I use basic conduction equation, i do not know what heat loss through the wall to assume. Since I only want to have one unknown which is thickness.

All I want to know is if the hot face is this temperature, then using ceramic wool of certain density, conductivity and thickness. What will be the cold face temp. Do some insulation manufacturers supply such tables, or equations?

Best

### RE: insulation thickness needed for boiler furnace

heat_in = heat_out
heat_in is based on the temperature difference between the inside and the surface through a thermal conductance
heat_out is based on the temperature difference between the ambient and and the surface through a thermal convection

solve the simultaneous equation.

TTFN (ta ta for now)
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### RE: insulation thickness needed for boiler furnace

It really doesn't matter what you "want", you must begin - as referenced in IRSTuff's equations, and approximated by the link by RSpain - by making the approximation, getting an approximate answer of the heat energy conducted and the approximate surface temperatures, and then repeating the iteration sequence.

It is called "work" and the method "works." (Yes, I am being pedantic, because you do need to learn. )

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