1. Lecture Objectives: Finish HW3 Discussion
Learn about heat recovery systems
Sensible, Enthalpy, and Desiccant wheels

2. Heat recovery

3. Rotary Air-to-Air Energy Exchanger Enthalpy wheel

4. Sensible, Enthalpy and Desiccant wheels

5. Sensible and Enthalpy Wheels

6. Desiccant wheel Reading assignment:
Figure 3 – A desiccant-based cooling system combined with regenerative heat exchanger, vapor compression cooling, and evaporative humidifier (hybrid system).
Reading assignment:

7. Fieldtrip Mechanical rooms in NMS building Next Tuesday: 11:30 am
Air-conditioning room in the attic of the building
Constant Volume Dual Duct System AHUs
AHU components
Control system
Duct system
Pipe system
Water system room in the basement of the building
Steam supply system
Cooled water supply system
Pumps
Sprinkler system

8. Meeting Spot

9. Constant Volume Dual Duct System

10. Constant Volume Dual Duct System for Laboratory Zones in NMS building
- 100% fresh air (no recirculation)
Large volume flow rate of fresh air
Sophisticated energy recovery system
Enthalpy wheel system
air to air energy recovery

11. Constant Volume Dual Duct System for Laboratory Zones in NMS building
Exhaust
Rotary Energy Exchangers
Return air
form laboratories
Fresh
air
Hot and
fresh air to
laboratories
Filters
Preheater
Heating coil
Cooling coil
Cool and fresh air
to laboratories