# Given the furnace wall and other conditions as specified in Problem 15.25, what thickness of celotex

Given the furnace wall and other conditions
as specified in Problem 15.25, what thickness of celotex (k  0:065 W/ mK) must be added to
the furnace wall in order that the outside surface temperature of the
insulation not exceed 340 K?

Problem 15.25

Determine the heat-transfer rate per square
meter of wall area for the case of a furnace with inside air at 1340 K. The
furnace wall is composed of a 0.106-m layer of fireclay brick and a 0.635-cm
thickness of mild steel on its outside surface. Heat transfer coefficients on
inside and outside wall surfaces are 5110 and 45 W/m2
»

Given the furnace wall and other conditions
as specified in Problem 15.25, what thickness of celotex (k  0:065 W/ mK) must be added to
the furnace wall in order that the outside surface temperature of the
insulation not exceed 340 K?

Problem 15.25

Determine the heat-transfer rate per square
meter of wall area for the case of a furnace with inside air at 1340 K. The
furnace wall is composed of a 0.106-m layer of fireclay brick and a 0.635-cm
thickness of mild steel on its outside surface. Heat transfer coefficients on
inside and outside wall surfaces are 5110 and 45 W/m2K, respectively;
outside air is at 295 K. What will be the temperatures at each surface and at
the brick-steel interface?

»

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