1. Objectives Review exam problems Further discuss final projects
Compare VAV systems with DOAS systems

2. VAV Example One system Multiple Spaces/Zones
- VAV box for each space/zone

3. VAV System Terms & Equations (you can find them in ASHRAE Standard 62)
Fraction of minimum outdoor air in space/zone supply air
Xi = VOAi / VSAi
Critical space
Space with maximum Xi , Z=max(Xi)
Fraction of outdoor air in system supply air
X = sum(VOA ) / sum(VSA)
Required Fraction of outdoor air:
Y=X/(1+X-Z)

4. Other Issues Related to VAV
Reheaters (sizing and control)
Fan control
Minimum supply air
Occupancy sensors

5. DOAS System

6. DOAS with multi-split systems
Fresh air?

7. DOAS fresh air configurations

8. DOAS fresh air configurations

9. Issues Related to DOAS Split of sensible and latent load
Selection of hydronic system
Winter vs. summer operation
Winter operation with DX systems (heat pump)