Latent Heat Flow

Latent heat is the heat, when supplied to or removed from air, results in a change of moisture content - the temperature of the air is not changed

English (Imperial) units

The latent heat flow can be expressed in English (Imperial) units as

Q_l = 60 h_we ρ q Δx         (1)

where

Q_l = latent heat flow (Btu/hr)

h_we = 1060 - latent heat of vaporization of water (Btu/lb)

ρ = 0.075 - air density at standard conditions (lb/ft³)

q = measured air flow (ft³/min)

Δx = humidity ratio difference (lb water/lb dry air)

SI-Units

The latent heat flow can be expressed in SI-units (metric) as

Q_l = h_we ρ q Δx / 3600         (2)

where

Q_l = latent heat flow (kW)

h_we = 2465.56 - latent heat of vaporization of water (kJ/kg)

ρ = 1.202 - air density at standard conditions (kg/m³)

q = air flow (m³/hr)

Δx = humidity ratio difference (kg water/kg dry air)

• Sensible Heat

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