A rectangular aluminium wall of area is to be used in a heat exchanger

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

Problem

A rectangular aluminium wall of area

2.0\,\text{m}^2

is to be used in a heat exchanger. The inner surface will be held at

60^\circ\text{C}

and the outer surface at

30^\circ\text{C}

. If the allowable rate of heat loss is

300\,\text{W}

and the thermal conductivity of aluminium is

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

, determine the minimum thickness the wall must have.