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29
Figure 1:
Heat flux through a west-facing, cavity-brick wall in summer.This shows that only 5-6 W/m
2
of heat energy
on average passes into the internal space.
(Adapted from Energy Efficiency and the Environment: The Case for Clay Brick, published by Think Brick Australia.)
50 W/m
2
passes through external
leaf. Most is absorbed.
200 W/m
2
passes into external leaf.
700 to 900 W/m
2
impinges on the external wall.
5-6 W/m
2
passes through
to inside of house.
Most heat is reflected.
External brick leaf
Internal brick leaf
Cavity