1. Lecture Objectives: Show an example of dual wheel system
Learn about desiccant systems

2. Heat recovery system in NSM building at UT
Sensible W
Enthalpy W

3. HW4 (Due March 23rd)
1) Using NMS’ AHU, show the process in the Psychrometric chart for Austin’s
a) Fall humid day (Outdoor: T=24C & RH=90%)
b) Fall dry day (Outdoor: T=24C & RH=50%)
c) Winter (T=3C RH=70%)
For fall: T hot deck is minimum 24C, T cold deck is 13C
For winter: T hot deck is 35C, T cold deck is 13C
For each case: (a,b, and c) calculate RH of supply air in hot and cold deck.

4. Also HW Reading assignment
Desiccant systems

5. Desiccant wheel

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

7. Variation in Cycles
Much more in the paper I gave you (Technical development of rotary
desiccant dehumidification and air conditioning)