Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion
Discussion Forum : Heat Transfer, Refrigeration and Air Conditioning - Section 1 (Q.No. 8)
8.
The by-pass factor for a cooling coil
Discussion:
19 comments Page 1 of 2.
Nikhil chaudhary said:
1 decade ago
With increase in velocity temp. Decreases & bypass factor increases.
Sakti Prasad Dhar said:
1 decade ago
Bypass factor is the (Amount of air bypassing the coil) divided by (the total amount of air passing the coil).
So a higher velocity of the passing air will decrease the time of contact for effective heat transfer and hence decrease the amount of heat transfer.
So it can be assumed that a greater portion of air is bypassing the coil without any heat transfer with the coil. So increasing the velocity of air decreases the Bypass factor.
So a higher velocity of the passing air will decrease the time of contact for effective heat transfer and hence decrease the amount of heat transfer.
So it can be assumed that a greater portion of air is bypassing the coil without any heat transfer with the coil. So increasing the velocity of air decreases the Bypass factor.
Raju said:
1 decade ago
As velocity increases Reynolds number increases which result in increase in heat transfer coefficient (turbulent) then bypass factor should increase?
Vicky said:
1 decade ago
I'm totally agree with You (@Raju) with increase in velocity forced convection increase and with this the temperature decreases which should decrease the bypass factor.
Abhi said:
1 decade ago
The by-pass factor can be increased by increasing the number of rows in a cooling coil or by decreasing the air velocity or by reducing the fin pitch.
Honey said:
1 decade ago
Wrong buddy, by pass factor would reduced because time available low to make contact and enough heat will taken by air.
S k pani said:
1 decade ago
Let t1 = air before entering coil.
t2 = mean coil temperature.
t3 = air temperature cooling coil.
So bpf = (t1-t2)/(t3-t2).
So if the velocity of air will increase then the numerator will decrease which will result in a increase in bpf.
t2 = mean coil temperature.
t3 = air temperature cooling coil.
So bpf = (t1-t2)/(t3-t2).
So if the velocity of air will increase then the numerator will decrease which will result in a increase in bpf.
Vineet said:
1 decade ago
By pass factor suggest the un-contacted air therefore if the speed will be high the air will not be able to contact the coil and hence bpf increases.
Shubh said:
9 years ago
Bypass factor is independent of velocity.
Golu said:
9 years ago
What is meaning of 'by pass air'?
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