Pipe replacement pressure drop problem
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The height of the vertical tube heat exchanger is 10m. It is a single flow process. The medium in the tube layer is from bottom to top. Does the pressure drop generated by the tube layer need to consider the pressure drop generated by the height? I beg you all the experts to help solve this problem! !
This post was last edited by wanlirn on 2019-5-17 13:31 In an open system, if there is no resistance in the pipeline, isn’t the height the lift? Of course, we have to count the closed system, only the total pressure drop and height of the pipeline are not included. It seems that you are not a relevant professional, this is a basic concept.
I just said that the height of a single heat exchanger is only 10 meters. I am not talking about the piping system. Please give me some advice.
This post was last edited by wanlirn on 2019-5-17 13:55 Because it is related to pipelines and you don’t want to think about it. It is not a system. It makes no sense to talk about the pressure drop alone. p1+1/2ρv12+ρgh1=p2+1/2ρv22+ρgh2+ΔP. Learn about the Panulli equation.
Then I would like to ask you another question. For a single vertical tube heat exchanger, the tube layer goes through 4 processes, which is what you call an open system (because the entire system was not designed by our company, so I don’t know whether the specific tube layer medium is open or closed). Can the pressure drop generated in the height direction offset the potential energy generated by the medium in the height direction? Please also give me some information. I originally majored in mechanics, not fluid mechanics.
This post was last edited by zjq1962 on 2019-5-17 16:23 The resistance drop of the medium in the tube side of the tube heat exchanger is mainly determined by the viscosity of the medium, the length of the flow channel, the inlet and outlet pipes, and the entry and exit of the medium into the heat exchange tube in the tube box. The resistance drop under the same conditions has little effect on whether the heat exchanger is vertical or horizontal.
This post was last edited by zjq1962 on 2019-5-17 16:27 For heat exchangers with the same conditions, the resistance of the horizontal installation tube side is reduced to 20.805KPa, and the vertical installation is 20.808. The impact of the shell side is slightly greater.
Hello, great god! What software is this? Can you share it?
It can be downloaded online, HTRI
The system provided by Haiyou upstairs is a closed system and the height has nothing to do with it. Open system is not enough. First of all, the basic concepts must be clear.
The example provided by Haiyou above is a closed type. I just emphasize that the pressure drop you calculate must be for the entire system to be meaningful. Otherwise, when you calculate other equipment in the future, you will think that the pressure drop of any equipment has nothing to do with the height, which is bad.