A laboratory furnace wall of area will operate with an inner surface temperature of…

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A laboratory furnace wall of area

0.50\,\text{m}^2

will operate with an inner surface temperature of

900^{\circ}\text{C}

while the surrounding room is at

30^{\circ}\text{C}

. The insulation available has thermal conductivity

1.5\,\text{W m}^{-1}\,\text{K}^{-1}

. The allowable heat loss is

250\,\text{W}

, but the design must include a safety factor such that the calculated heat loss does not exceed

70\%

of this value. Determine the minimum thickness of insulation required. Give your answer in metres.