conductivity may be taken as 0.2 W/m. C., compute the temperature difference across the material. 7. A temperature difference of 85 C is impressed across a fibber glass layer of 130 mm thickness. The thermal conductivity of the fibber glass is 0.035 W/m. C... Compute the heat transferred through the material per hour per unit area. 8. The concrete slabof a basement is 11 m long, 8 m wide and 0.20 m thick. During the winter, temperatures are nominally 17C and 10C at the top and bottom surfaces, respectively. If the concrete has a thermal conductivity Of 1.4 W/m.K, what is the rate of heat loss through the slab? If the basement is heated by a gas furnace operating at an efficiency of nf 0.90 and -