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the design and measured exﬁltration ratios, i.e. parts of the supply air leaking

through the building envelope in 30 units.

Ventilation eﬃciency

An eﬃcient airing supplies the occupants with fresh air and blows polluted, old

air in unoccupied spaces. The ventilation eﬃciencies in several rooms, assessed

using the method described in Chapter 3, are illustrated in Figure 0.6.

Rather high ventilation eﬃciency, indicating piston-type ventilation, can be

seen in rooms 6 to 10, which are high auditoriums. The normal-height rooms 2

to 5 present a complete mixing, while room 1 shows poor ventilation eﬃciency,

partly explained by the fact that supply and exhaust are both located at the

ceiling in this room.

These few examples clearly illustrate the usefulness of measurements to

detect dysfunction.

-25%

25%

50%

75%

100%

-10% 0% 10% 20%

Measured

Design exfiltration ratio

Figure 0.5 Design and measured exﬁltration ratios compared in 30 units

Source: Roulet et al., 2001a.

20%

40%

60%

80%

100%

1 2 3 4 5 6 7 8 9 10

Ventilation efficiency

Figure 0.6 Ventilation eﬃciency in some ventilated areas

Note: Dark bands are uncertainty bars. Note that in one unit the eﬃciency is below 50

per cent, indicating shortcuts and dead zones.

Source: Figure drawn from a table published in Roulet et al., 2001a.

Introduction xvii

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Sharp JX-9400 Technical Information Seite 18