Series connection of shell-and-tube heat exchangers, please advise
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As shown in the figure, question 2 states that two heat exchangers are connected in series and the flow rate becomes twice the original value. What does this mean? I can’t understand it. I’m asking everyone for advice
It is also said that when changing from a single pipeline to a dual pipeline, the flow rate doubles as well. What’s the situation? I’d like to ask everyone for advice. .
The last edit to this post was made by sifangok on 2017-1-11 at 21:39. Imagine a series-connected heat exchanger as an equivalent heat exchanger with twice the pipe length and half as many units; since the number of units is halved, wouldn’t the cross-sectional area also be halved, resulting in a flow velocity that is twice as high?
This means the flow cross-sectional area is reduced by half, so the flow velocity increases
Is this a question for a doctoral entrance exam or a master’s entrance exam?
This post was last edited by wanlirn on 2017-1-14 09:41. It turns out that on eight-lane highways, sometimes only half of them are under construction and become four lanes; to maintain the same level of traffic volume, it’s necessary to increase the speed of traffic. Easy to understand, right?
1 Simple series connection: as the flow resistance increases, the flow velocity decreases； 2 Unless the total heat exchange area before and after series connection remains unchanged, the flow rate will double.