Page 460 - Air pollution and greenhouse gases from basic concepts to engineering applications for air emission control

14.3 IAQ Control by Ventilation/Dilution 441

3 3
1;000 m CO 2 1:83 kg CO 2 =m CO 2 3 3
c e ¼ ¼ 1:83 10 kgCO 2 =m air
3
6
10 m air
The exhaust ventilation rate is
_ s CO 2
Q e ¼
m s c s
c e 1
m e c e
2:98 10 4 kg CO 2 =s
3 3
¼
1000m CO 2 1:83kg CO 2 =m CO 2 1 0:822 500
10 m air 0:855 1000
3
6
3
¼ 0:31 m air=s

14.4 Indoor Air Cleaning Model

Similar to the air dispersion models for ambient air pollutants, we can develop
models for indoor air dispersion. The simplest is box model as introduced in
Sect. 11.1. We consider an indoor space of concern as a box, which seems to be
more reasonable than being treated for an ambient environment. Most models
assume the indoor air is uniform for the ease of analysis [10]. This is called compete
mixing model. Zonal models are available too, but we will not discuss them in this
book. Instead, we will introduce an indoor air cleaning model as follows [10].

Fig. 14.3 Schematic diagram for the ventilation model with indoor air cleaning