Heat exchanger problem
Thread Content
Under the same conditions, the medium flow rate in the heat exchanger increases and the heat transfer effect weakens. Is this correct?
Yes, short residence time is not good for heat exchange.
No, increasing the flow rate and decreasing the residence time will affect the heat transfer effect, but at the same time, increasing the degree of fluid turbulence will increase the heat transfer effect. Let’s look at the pk of the two.
No, as the flow rate of the medium increases, the heat transfer effect should be enhanced. Whether it is used as a material or a cooling medium, the flow rate increases, the laminar flow of the material may decrease, the K value increases, and the heat transfer effect is enhanced. Of course, what the poster mentioned is mainly for the material to be heat exchanged. Because the flow rate increases and the residence time is shortened, the cooling effect is weakened for the material, but the final result depends on comparison. So the concept of the poster's question is not very clear.
There is no simple answer. Whether the heat exchange effect is good or not is related to many factors, which are sometimes contradictory. The selection should be optimized.
Agree with the fourth floor's point of view. There are some principles in chemical engineering.
I agree with the fourth floor's point of view, the heat transfer calculation is relatively complicated. It cannot be said that a single factor increase or decrease will have an impact on the heat transfer effect.
What does LZ’s “heat exchange effect” refer to? If it refers to heat exchange, the faster the flow rate, the better the heat transfer. ； If it refers to the temperature difference between the inlet and outlet, the slower the flow rate, the better.
As mentioned on the fourth floor, this is a matter of specific analysis of specific issues and can be adjusted based on experience.
Support the fourth floor statement! ! ! ! ! !
No, the heat transfer effect should be better if the flow rate is increased. Increasing the flow rate increases the flow rate of the medium in the heat exchanger, resulting in better turbulence effect and better heat transfer effect.