1. Objectives Continue with advance HVAC systems
Compare Residential and Commercial Systems
- Trends in residential HVAC

2. Sensible and Enthalpy Wheels

3. Heat recovery system in NSM building at UT

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

5. Review: Computer software for load calculation

6. Review: Residential vs. Commercial systems
Course focus was on HVAC equipment that is used in both: residential and commercial systems
Emphasize on the application in commercial systems

7. Commercial HVAC Systems
Single zone
Multi zone
All Hydroinic
that relay on
infiltration
VAV
CAV
CAV
VAV
With and
without
humidity
control
With and
without
reheaters
Dual
duct
Dual
duct
With
reheaters
DOAS with
fan coils
DOAS with
fan coils
or radiant
ceilings
This is not the complete list !
There is no strict division!

8. Typical Components in Commercial systems
Constant operation
Outdoor air supply
Two fans (supply and return)
Multizone system
Control
…..

9. Residential System

10. Residential system Technology is feasible and cost-effective
Several barriers to widespread use:
Up-front costs are still higher
Insufficient data on resale costs
Lack of experienced designers