1. Objectives Finish with fans Learn about DOAS and VAV
Project related topics

2. Fan Performance

3. Centrifugal fans

6. Axial Fans

7. VAV
with no re-heaters
with re-heaters
with fan terminal unis

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

9. 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)

10. Example Solution
Space1
Space 2
Space 3
Space 4
VSA
VOA Xi X Z Y

11. Other Issues Related to VAV
Reheaters
Fan control
Minimum supply air
Occupancy sensors

12. DOAS System

13. DOAS with multi-split systems
Fresh air?

14. DOAS fresh air configurations

15. DOAS fresh air configurations

16. 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)

17. Course Project