A carpenter builds an outer house wall with a layer of wood on the outside and a…

PHYSICS · Multi-part · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A carpenter builds an outer house wall with a

2.0\,\text{cm}

layer of wood on the outside and a

3.5\,\text{cm}

layer of insulation as the inside wall surface. The wood has

k=0.08\,\text{W m}^{-1}\text{K}^{-1}

and the insulation has

k=0.01\,\text{W m}^{-1}\text{K}^{-1}

. The interior surface temperature is

19^\circ\text{C}

and the exterior surface temperature is

-10^\circ\text{C}

. (a) What is the temperature at the plane where the wood meets the insulation? (b) What is the rate of heat flow per square metre through this wall?