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Letter symbols

for use in equations with appropriate subscripts (Other units of volume or rate may be indicated):
Aarea: sq ft
aarea of transfer surface per unit of tower volume; sq ft per cu ft
cspecific heat
dprefix indicating differential
Ddiameter
Gmass air flow; lb dry air per hr per sq ft
ggravitational acceleration; ft per sec per sec
henthalpy of air-water vapor mixture; Btu per lb dry air
Kover-all enthalpy transfer coefficient. Usually expressed as lb per hr per sq ft per lb water per lb dry air.
Lmass water flow; lb per hr per sq ft
L/Gliquid-to-gas ration; lb water per lb dry air
tair temperature; F
Twater temperature; F
Veffective cooling tower volume; cu ft per sq ft
vspecific volume; cu ft per lb
Whumidity ratio (specific humidity); grains moisture per lb dry air (or lbs vapor per lb dry air if so indicated)
Ka V/Ltower characteristic