Formulas - Calculating Condensate Load for Process Air Heaters
F x Cp x d x 60 min/hr x ∆T
Q = —————————————
H
Where:
Q = Condensate Load in lbs/hr
F = Cubic feet of air per minute
Cp
= Specific heat of air in btu/lb--°F
d = Density of air--.075 lbs/cu ft
∆T
= Temperature rise in °F
H = Latent heat of steam in btu/lb
EXAMPLE:
10 PSIG STEAM
Heating indoor 70° air to 180°F = 110°∆F
F = Cubic feet of air per minute 3000
Cp = Specific heat of air in btu/lb--°F
.24
d = Density of air--.075 lbs/cu ft .075
∆T = Temperature rise in °F
110
H = Latent heat of steam in btu/lb 953
3000CFM x 0.24 x .075 x 60 min/hr x 110
Q = —————————————
953
Q = 374 lbs/hr
SAFETY FACTOR:
Using Outdoor Air 3
Using Indoor Air 2
Properties of Saturated Steam
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