In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

  • AHigh, of the order of 25°
  • BAs low as possible (3 to 11°C)
  • CZero
  • DAny value
Correct Answer : (B)

As low as possible (3 to 11°C)

Hints :

Nusselt number (NN) is given by


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

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