Air Conditioning - Cooling of Air and Condensate

Water may condensate when air is cooled in an air conditioning system

The cooling process in air conditioning units may generate condensate water.

cooling condensate

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

qcond = qair dwlb / (8.33 vda)         (1)

where

qcond = condensate generated (gallons per minute, gpm)

qair = air flow (cubic feet per minute)

dwlb = difference in specific humidity (lbwater / lbdry air)

vda = specific volume of air (cubic feet/lbdry air)

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

qcond = qair dwgr / (7000 8.33 vda)       

        = qair (wgr-out - wgr-in) / (7000 8.33 vda)         (2)

where

qcond = condensate generated (gallons per minute)

qair = air flow (cubic feet per minute)

dwgr = difference in specific humidity (grwater / lbdry air)

wgr-out = specific humidity in air out (grwater / lbdry air)

wgr-inspecific humidity in air in (grwater / lbdry air)

vda = specific volume of air (cubic feet/lbdry air)

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

Related Topics

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

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