1. Dehumidification
Justin Dunnahoo

2. Uses Humid air can lead to mold and mildew
Humid air is preferred by many insects
Moths, fleas, cockroaches, etc
Ice Arenas
More comfortable environment
Reduce load on ice making equipment
Humidity control in industrial climatic chambers

3. Processes Mechanical/Refrigerative Desiccative Electronic
Air Conditioners
Makeshift

4. Mechanical/Refrigerative Dehumidification
Most Common
Draws moist air over refrigerated coil using a small fan
Saturation Vapor Pressure decreases with the decreasing temperature
Moisture in air condenses and drips into collection bucket
Air is then reheated by warmer part of refrigeration coil
Most effective in high ambient and RH>45%

5. Desiccative Dehumidification
Employs a desiccant material to produce a dehumidification effect
Desiccant- a substance with the ability to attract moisture from the environment to induce dryness
Ex: Silica Gel
More effective in low temps with low humidity
Process
Expose desiccant to high humidity air stream and allow it to absorb moisture
Then expose to low humidity (reactivation) air stream to draw out retained moisture
Heat the reactivation air stream to remove moisture or have it exit the system

6. Other Dehumidification Processes
Electronic
Use a heat pump to create a cool surface for condensation
Very quiet (no compressor)
Mainly small dehumidifiers
Air Conditioners
Automatically accumulate water when they cool the air
Moisture removed through drain to outside
Makeshift
Window AC units can be reversed to send exhaust back into room, warmer and less humid

7. Questions?