GENERAL FORMULAS - Lincoln Assoc
GENERAL FORMULAS
TOTAL BTUH
TOTAL BTUH = 4.5 x SCFM x (Total Heat Ent. Air – Total Heat Lvg. Air)
Where 4.5 = Density Std. Air x 60
Density Std. Air + .075 lbs./cu.ft.
Minutes/hr. = 60
TOTAL BTUH = 500 x GPM x (Lvg. Water Temp. – Ent. Water Temp.)
Where 500 = lbs./gal. X min./hr. x Specific heat water
Lbs./gal. = 8.33
Minutes/hr. = 60
Specific heat water = 1
SENSIBLE BTUH
SENSIBLE BTUH = 1.08 x SCFM x (Ent. Air DB – Lvg. Air DB)
Where 1.08 = (Specific heat of air at 70E) x (Minutes/hr.) x Density Std. Air
Specific heat of air = .24 at 70EF
Minutes/hr. = 60
Density Std. Air = .075 lbs./cu.ft.
WATER VELOCITY
5/8” TUBES: WATER VELOCITY FPS = (1.07 X GPM) No. of Tubes Fed
½“ TUBES: WATER VELOCITY FPS = (1.68 X GPM) No. of Tubes Fed
FACE AREA
F.A. = (FH x FL) 144
F.A. = (SCFM) Face Velocity (FPM)
FACE VELOCITY
F.V. = (SCFM) Face Area (Sq.Ft.)
SENSIBLE TOTAL RATIO
S/T RATIO = (Sensible BTUH) Total BTUH
MBH PER SQUARE FOOT OF FACE AREA
MBH/SQ.FT. = (Total BTUH) Face Area (Sq.Ft.) x 1000
LEAVING DRY BULB
LDB = EDB + (Total BTUH) (SCFM x 1.08)
LEAVING WATER TEMPERATURE
LWT = EWT – (Total BTUH) (GPM x 500)
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