The by-pass factor of a cooling coil is 0.2 If the surface temperature is 5°C and air enters at 40°C, the exit temperature of air Will be

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ISRO IPRC Technical Assistant Mechanical 21 April 2016 Official Paper
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  1. 5°C
  2. 12°C
  3. 20°C
  4. 40°C

Answer (Detailed Solution Below)

Option 2 : 12°C
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Detailed Solution

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Concept:

Bypass Factor represents the fractional part of total inlet air which is not in contact with the coil.

The bypass factor of a cooling coil is given by:

Calculation:

Given:

BPF = 0.2, Tinlet = 40°C, and Tcoil = 5°C

∴ Toutlet = 12°C

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