1. Objectives
Psychometrics
Psychometric chart
Examples in AHUs

3. Condition Line for a Space

4. AHU

5. Sensible heating

6. Dehumidification by Cooling

7. Real Dehumidification Process

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

9. Evaporative Cooling (air washing)

10. Adiabatic mixing
Governing equation
External heat =0!

11. Mold in a duct
tsurface < tdp
Condensation

12. Air conditioning 12

13. Recirculation 13

14. Reheat 14

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

16. Evaporative Cooler 16