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

Heat recovery

Rotary Air-to-Air Energy Exchanger Enthalpy wheel

Sensible, Enthalpy and Desiccant wheels

Sensible and Enthalpy Wheels

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: http://www.ce.utexas.edu/prof/Novoselac/classes/CE397b/Handouts/1-s2.0-S1364032109001737-main.pdf

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

Meeting Spot

Constant Volume Dual Duct System

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

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