1. Objectives
Learn about Fans
Discuss
Exam
Final Project

2. Centrifugal fans

5. Axial Fans

8. Fan Laws “Approximate relationships”
Given two aerodynamically similar fans, can extrapolate performance data
Be very careful

9. Question
How does fan power consumption vary with volumetric air flow rate?

10. Controlling Air Flow

11. Dampers

12. Effect on Fan Curve

13. VAV Operation

14. Summary of Air Distribution Systems
Select diffuser based on ADPI
Given a layout of duct system
Calculate total pressure drop
Identify fittings
Deal with non-circular ducts
Use fitting loss coefficient or equal length method
Select the fan based on fan and duct curve