Steam & Condensate Equations

Steam consumption and condensate generation formulas heating liquids or gas flows

Some common steam and condensate equations can be expressed as

Steam Heating

m_s = h / 960         (1)

where

m_s = steam mass flow rate (lbs./hr.)

h = heat flow rate (Btu/hr.)

Steam Heating Liquid Flow

m_s = q_l 500 SG_l C_pl dt_l / L_s         (2)

where

m_s = steam mass flow rate (lbs./hr.)

q_l = volume flow liquid (gallons per minute, gpm)

SG_l = specific heat capacity of the liquid (Btu/lb.^oF)

C_pl = specific gravity of the fluid

dt_l = temperature difference liquid (^oF)

L_s = latent heat steam (Btu/lb)

Steam Heating Air or Gas Flow

m_s = q_g 60 ρ_g C_pg dt_g / L_s         (3)

where

m_s = steam mass flow rate (lbs./hr.)

q_g = volume flow gas (cubic feet per minute, cfm)

ρ_g = density of the gas (lb/ft³)

C_pg = specific gravity of the gas

dt_g = temperature difference gas (^oF)

L_s = latent heat steam (Btu/lb)

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