Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂
e₁ + e₂
(e₁ + e₂)/ e₁ + e₂ - e₁e₂
e₁e₂

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP