1. Objectives
Processes in Cooling towers and AHUs

3. Air Washers/Evaporative Coolers
Heat and mass transfer is mutually compensating
Can evaluate based on temperature drop, humidification, or comparison to other energy exchangers

4. Cooling Tower
Similar to an evaporative cooler, but the purpose is often to cool water
Widely used for heat rejection in HVAC systems
Also used to reject industrial process heat

6. Cooling Tower
Similar to an evaporative cooler, but the purpose is often to cool water
Widely used for heat rejection in HVAC systems
Also used to reject industrial process heat

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

8. Air conditioning 8

9. Reheat 9

10. Recirculation 10