Refrigeration and Air Conditioning
The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

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

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

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