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| Figure 21. Section of two-stoery
building showing ventilation chimney |
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Ventilation
Chimney: |
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| The arrangement of interior spaces
in some of the apartments is not conducive to good cross ventilation.
To overcome this and to create sufficient air flows at times when there
is not much wind, a ventilation chimney has been placed in the centre
of each unit (...). This encourages thermocirculation of air through
the apartment using the stack effect. The ducts have been designed to
minimize noise transmission. The devices can be fan-assisted so that,
if there is insufficient wind, air change rates of 30 ACH are achieved. |
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In the single-storey
buildings, the chimneys extend from just below the ceiling (where the
warm air is taken in) to the top of the building. As indicated earlier,
the top of the chimney has been designed to look like the stacks found
traditionally in this area. |
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In the two-storey buildings, the
lower opening of the chimney is located just below the ground floor ceiling
(Figure 21). |
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In one of the buildings
an attempt has been made to further encourage the thermocirculation of
air by glazing the south-west side of the chimney between the ground
and upper floors. |
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Radiant Barrier |
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| The roof of one of the buildings is insulated externally
with expanded polystyrene faced with aluminium foil. This, together with
an adjacent air gap, decreases the transmission of long wave radiation
to the building. This technique is seldom used in Europe but in the US
it has been found to reduce cooling loads by 10% for no additional capital
cost. The system has been installed in one of the buildings in this complex
for demonstration purposes. |
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