Temperature profile in Heat Exchanger:
The plot of “flow temperature” Vs “length of the tube” is known as temperature profile in Heat exchanger. From the temperature profile we can conclude, which flow pattern is best in heat exchanger and why it is so.
Parallel flow temperature profile in 1-1 Heat Exchanger:
Sketch of 1-1 Heat Exchanger:
1-1 Heat exchanger means, 1-tube side and 1- shell side pass heat exchanger. It is as shown in the below figure
Parallel flow:
Temperature profile of 1-1 Heat exchanger – Parallel flow:
Counter Flow:
In counter flow tube side flow and shell side flow are in opposite direction, and a typical flow scheme is as shown in the figure.
Temperature profile of 1-1 Heat exchanger – Counter flow:
If we observe, we can see that, in counter flow there is uniform temperature difference between hot and cold fluids and this difference decreases with the length of the tube in parallel flow. From the above two temperature profiles we can conclude that counter flow is more efficient than parallel flow.
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