The by-pass factor of a cooling coil is 0.2. If the surface tempe
| 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 _______.
A. 5°C
B. 12°C
C. 20°C
D. 40°C
Please scroll down to see the correct answer and solution guide.
Right Answer is: B
SOLUTION
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:
\(BPF = \frac{{{T_{outlet}} - {T_{coil}}}}{{{T_{inlet}} - {T_{coil}}}}\)
Calculation:
Given:
BPF = 0.2, Tinlet = 40°C, and Tcoil = 5°C
\(0.2~=~\frac{T_{outlet}\ -\ 5}{40\ -\ 5}\)
∴ Toutlet = 12°C