Q.

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)

  • A(td₂ - td₃)/(td₃ - td₁)
  • B(td₃ - td₂)/(td₃ - td₁)
  • C(td₃ - td₁)/(td₂ - td₃)
  • D(td₃ - td₁)/(td₃ - td₂)
Correct Answer : (B)

(td₃ - td₂)/(td₃ - td₁)

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Nusselt number (NN) is given by

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In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

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