A Concrete Wall of a Cold Storage Room Measures 3

A concrete wall of a cold storage room measures 3.0 m high,5.0 m wide,and 20 cm thick.The room temperature is maintained at -10°C and the outside temperature is 20°C The inside wall is to be covered by a layer of wood in order to reduce the rate of heat loss through the wall BY 90 percent.The thermal conductivities of concrete and wood are 0.80 W/m • K and 0.040 W/m • K,respectively.Under steady state conditions,the thickness of the layer of wood required is closest to

A) 60 mm.
B) 70 mm.
C) 80 mm.
D) 90 mm.
E) 100 mm.

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