Question

The roof ceiling has the following assembly:

     1) metal structure slab: conductivity k₁=4.0 W/mK, thickness L₁=0.5 cm,

     2) Polystyrene: k₂=0.05 W/mK, L₂=10 cm,

     3) Ceiling tiles:  k₃=0.5 W/mK, L₃=1.0 cm.  

Internal and external convection coefficients are: h_internal= 8 W/m²K and h_external= 24 W/m²K.

a) (2 points) Calculate the resistance of Concrete slab, Polystyrene, and Gypsum wall board.

b) (1 point) Considering the insulation properties, which assembly component is the most important? Rank themaccording to the thermal insulation contribution.

c) (2 points) Calculate the resistance of internal and external air layer.

d) (2 points) Calculate the conductivity (U-value) of the wall.

Answer 1

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