Heat exchanger
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Which has a better heat exchange effect, \"in from below and out from above\" or \"in from above and out from below\" for the shell side of a heat exchanger? Why is it that for a set of heat exchangers A and B, A is designed with fluid flow from bottom to top, while B is designed with fluid flow from top to bottom? What is the reason for this?
It first appeared around junior high school chemistry, in the section on distillation. When the shell-side fluid is a liquid, flow is from bottom to top; when it is a gas, flow is from top to bottom. This is done to ensure that the fluid fills the entire shell-side space, resulting in smaller flow dead zones and higher efficiency.
It is a liquid, and it flows through the shell side; the liquid enters from below and exits from above through heat exchanger A, then enters from above and exits from below through heat exchanger B. What is the principle behind this design? Since they are both liquids, why is the way they enter and exit the heat exchanger different?
This is not necessarily the case; for example, steam, especially when condensed, needs to flow in from above and out from below, while water needs to flow in from below and out from above.
For general liquids, it is required that fluid enters from the bottom and exits from the top; the reason for having two sets of AB arranged opposite to each other is to facilitate convective flow, thereby achieving better heat exchange effects
This part is meant to facilitate pipeline connection and reduce pressure loss; there’s no other purpose to it
The piping layout should be determined by the flow direction of the pipes on site – with flow from top to bottom or from bottom to top; as long as the relative flow directions of the fluids in the shell side and the tube side remain unchanged, it has no impact on the heat transfer efficiency.
When two heat exchangers are stacked, one must be above the other
This post was last edited by Luohuafeyue on 2021-3-25 at 21:17. First, it is necessary to describe the fluids flowing through the tube side and shell side of each heat exchanger; it is also advisable to specify the required inlet and outlet temperatures, as this facilitates analysis and decision-making.