Heat flows through a composite slab, as shown below. The depth of the slab is 1 m. the k values are in W/m.K. The overall thermal resistance in K/W is ________

A. 17.2 B. 21.9 C. 28.6 D. 39.2
Heat flows through a composite slab, as shown below. The depth of the slab is 1 m. the k values are in W/m.K. The overall thermal resistance in K/W is ________
A. 17.2 B. 21.9 C. 28.6 D. 39.2