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Air Conditioning - Cooling of Air and Condensate Generated

Water may condensate when air is cooled in air conditioning systems.

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In air cooling processes condensate water may be generated from the moist air.

Cooling moist air - generating condensate water

If we know the condition and the specific humidity of the air before and after an air conditioning unit - the condensate generated can be calculated

q cond = q air dw lb / (8.33 v da )                                     (1)

where

q cond = condensate generated (gallons per minute, gpm)

q air = air flow (cubic feet per minute)

dw lb = difference in specific humidity (lb water / lb dry air )

v da = specific volume of air (cubic feet/lb dry air )

With specific humidity expressed in grains water per lb dry air (1) can be expressed as

q cond = q air dw gr / (7000 8.33 v da )

= q air (w gr-out - w gr-in ) / (7000 8.33 v da ) (2)

where

q cond = condensate generated (gallons per minute)

q air = air flow (cubic feet per minute)

dw gr = difference in specific humidity (gr water / lb dry air )

w gr-out = specific humidity in air out (gr water / lb dry air )

w gr-in = specific humidity in air in (gr water / lb dry air )

v da = specific volume of air (cubic feet/lb dry air )

7000 = grains per lb m of water ( 1 grain = 0.000143 lb m = 0.0648 g )

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Related Topics

  • Air Conditioning Systems

    Design of Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.

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