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DEHUMIDIFICATION

DEHUMIDIFICATION. A large part of what an AC system does is remove humidity (latent heat) Humidity load must be figured for 3. Multipliers are used to increase system size to compensate for the latent heat removal. 4. An undersized system A. Acts like a large dehumidifier

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DEHUMIDIFICATION

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  1. DEHUMIDIFICATION • A large part of what an AC system does is remove humidity (latent heat) • Humidity load must be figured for • 3. Multipliers are used to increase system size to compensate for the latent heat removal

  2. 4. An undersized system A. Acts like a large dehumidifier B. Removing humidity 1) Not cooling the space 5. An oversized system A. Cools to quickly B. Satisfying the thermostat 1) Not removing the humidity a) Occupants feel cool and wet or sticky

  3. DEW POINT 1. The process of removing moisture from the air 2. Requires the use of a refrigerated coil set in the air stream A. Forcing room air over the coil 1) Furnace 2) Air handler 3) Room dehumidifier 3. The coil temperature has to be below the dew point A. The temperature at which water will condense out of the air

  4. Example: 1. The temperature at which moisture begins to condense out of the air Example: A glass of water in a 75ºF room @ 50% RH the water would slowly evaporate into the air A. Cooling the glass with ice a. Lowers the glass surface temp b. At 55.5ºF: i. Water will begin to form on the outer surface area of the glass

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