The Roof Of A House Consists Of A 15 Cm Thick Concrete Slab

On a clear winter night the ambient air is reported to be at 10 c while the night sky temperature is 100 k.

The roof of a house consists of a 15 cm thick concrete slab. The emissivity of the outer surface of the roof is 0 9 and the convection heat transfer coefficient on that surface is estimated to be 15 w m2 c. The inner surface of the roof is maintained at a c. The convection heat transfer coefficients on the inner and outer surfaces of the roof are 5. The roof of a house consists of a 15 cm thick concrete slab k 2 w m k that is 15 m wide and 20 m long the convection heat transfer coefficients on the inner and outersurfaces of the roof are 5 and 12 w m 2 k respectively.

The average ambient air and the night sky temperatures for the entire night are predicted to be 6 c and 260 k respectively. The roof of a house consists of a 15 cm thick concrete slab k 1 4 w m k and α 0 69 10 6 m 2 s that is 18 m wide and 32 m long. The roof of a house consists of a 15 cm thick concrete slab k 2 w m c that is 15 m wide and 20 m long. The convection heat transfer coefficients on the inner and outer surfaces of the roof are 5 and l w m 2 k respectively.

1 105 the roof of a house consists of a 15 cm thick concrete slab k 2 w m k that is 15 m wide and 20 m long. One evening at 6 pm the slab is observed to be at a uniform temperature of 18 c. On a clear winter night the ambient air is reported to be at 10 c while the night sky temperature is 100 k. The emissivity of the outer surface of the roof is 0 9 and the convection heat transfer coefficient on that surface is estimated to be 15 w m k.