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Lecture Objectives:

Explore dual wheel system examples & desiccant systems in NSM building at UT Austin. Learn about heat recovery, enthalpy, sensible heat, HW4 due on March 23. Analyze Psychrometric processes for different conditions. Utilize NMS' AHU. Reading assignment included.

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Lecture Objectives:

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

  2. Heat recovery system in NSM building at UT Enthalpy W Sensible 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 • http://www.ce.utexas.edu/prof/Novoselac/classes/CE397b/Handouts/1-s2.0-S1364032109001737-main.pdf

  5. Desiccant wheel

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

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

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