The section of a vertical wall is made up of fiberglass insulation slabs separated by wooden studs. The thermal conductivity of fiberglass and wood are 0.04 Wmí1 Kí1 and 0.18 Wmí1 Kí1 respectively....

The section of a vertical wall is made up of fiberglass insulation slabs separated by wooden studs. The thermal conductivity of fiberglass and wood are 0.04 Wmí1 Kí1 and 0.18 Wmí1 Kí1 respectively. The thickness of the wall is 160 mm. The temperatures of the inner and outer surfaces of the wall section are 22°C and 4°C respectively. The ratio of the insulation area to the total wall area is 0.8. Calculate (i) the total heat flow rate through the wall per unit area and (ii) the rate of heat flow through unit area of studs.