Wall of a building consists of two layers of brick (each 12 cm. thick with k=1.2 W/m K), an insulation layer (8 cm. thick polystyrene molded beads, k=0.038 W/m.K) between the brick layers. Inner and outer surfaces of the wall are covered with layers of concrete and stone mix (each 2.5 cm thick, with k=1.4 W/m K). The heat transfer coefficients inside and outside of the wall are 15 W/m2K and 25 W/m2K respectively. Walls of an apartment exposed to outside has an area of 110 m2. If the temperature inside the building is kept at 25 oC and outside temperature is at 0 oC, a) What is the rate of heat loss through the walls? b) Find the temperature distribution through each layer (there are five layers). Draw a plot of temperature vs. width through the wall. c) What would be the heat loss without the insulating layer?
Wall of a building consists of two layers of brick (each 12 cm. thick with k=1.2 W/m
K), an insulation layer (8 cm. thick polystyrene molded beads, k=0.038 W/m.K) between the
brick layers. Inner and outer surfaces of the wall are covered with layers of concrete and stone
mix (each 2.5 cm thick, with k=1.4 W/m K). The heat transfer coefficients inside and outside of
the wall are 15 W/m2K and 25 W/m2K respectively. Walls of an apartment exposed to outside
has an area of 110 m2. If the temperature inside the building is kept at 25 oC and outside
temperature is at 0 oC,
a) What is the rate of heat loss through the walls?
b) Find the temperature distribution through each layer (there are five layers). Draw a plot of
temperature vs. width through the wall.
c) What would be the heat loss without the insulating layer?
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