1. Objectives
Psychometrics
Psychometric chart
Examples in AHUs

3. AHU

4. Adiabatic mixing
Governing equation
External heat =0!

5. Sensible heating

6. Dehumidification by Cooling

7. Real Dehumidification Process

8. Transport of saturated air
tsurface < tdp
Condensation
Mold in a duct

9. Humidification hw Specific enthalpy of water added to system
hg Specific enthalpy of saturated water vapor

10. Evaporative Cooling (air washing)

11. Condition Line for a Space

12. Systems: Single-Zone Air Systems
Zone – any space with a thermostat

13. Air conditioning 13

14. Recirculation 14

15. Reheat 15

16. Evaporative Cooler 16