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

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Refrigeration and Air Conditioning
The bypass factor of a cooling coil decreases with

Decrease in fin spacing and increase in number of rows
Decrease in fin spacing and decrease in number of rows
Increase in fin spacing and decrease in number of rows
Increase in fin spacing and increase in number of rows

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