Refrigeration and Air Conditioning
The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₂)/(td₃ - td₁)
(td₃ - td₁)/(td₃ - td₂)
(td₂ - td₃)/(td₃ - td₁)

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Refrigeration and Air Conditioning
The bypass factor for a cooling coil

Remains unchanged with increase in velocity of air passing through it
Increases with increase in velocity of air passing through it
Decreases with increase in velocity of air passing through it
May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering

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