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List of Figures and Tables

Figures

0.1 Design and measured outdoor airﬂow rate per person in

12 buildings xv

0.2 Relative diﬀerence between measured and design outdoor airﬂow

rate in 37 air handling units xv

0.3 Comparison of design and measured recirculation rate in 34 air

handling units xvi

0.4 Histogram and cumulated frequencies of measured re circulation

rates in air handling units designed without recirculation xvi

0.5 Design and measured exﬁltration ratios compared in 30 units xvii

0.6 Ventilation eﬃciency in some ventilated areas xvii

1.1 Records of CO

concentration in an oﬃce room 6

2.1 Schematics of a supply and exhaust air handling unit 16

2.2 Location of the measur ement points in circular and rectangular

ducts 18

2.3 Measuring the airﬂow rate in a duct with the tracer gas dilution

method 19

2.4 Schematics of a compensated ﬂowmeter 20

2.5 Locations of tracer gas injection (arrows), and sampling points

for concentration measurements (C

) in a typical supply and

exhaust air handling unit. 21

2.6 Evolution of tracer gas concentration versus time 22

2.7 Example of multiple injection devices 23

2.8 The simpliﬁed network representing the air handling unit and

ducts 25

2.9 Measured airﬂow rates in a leaky air handling unit 33

2.10 Concentrations at locations shown in Figure 2.5 resulting from

injection of SF

as tracer 1 and N

O as tracer 2 in a leaky air

handling unit 34

2.11 Tracer gas concentrations in the supply duct, ups tream (3) and

downstream (3

) of the tracer gas injection port 36

2.12 Conﬁdence interval of the recirculation ratio as a function of the

recirculation ratio itself for three assessment methods 38

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 210 211

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Sharp JX-9400 Technical Information Seite 8