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)

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

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Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

Maintains different temperatures in evaporator in proportion to load
Ensures the evaporator completely filled with refrigerant of the load
None of these
Is suitable only for constant load systems

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