How to calculate a soda heat exchanger with phase change
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Soda water shell-and-tube heat exchanger, with cooling water flowing in the tube side and steam flowing in the shell side. Inside the shell side, all the steam condenses into water. In this case, when calculating the pressure drop in the shell side, should the data such as flow rate, viscosity, and density be taken from the values related to steam or from those related to water? Explain the reason.
When calculating the pressure drop in the shell side, the data corresponding to steam condensed into water should be used, that is, the flow rate, viscosity, density, and other properties of water. Since the steam has undergone phase change inside the shell side and condensed into water, the physical properties of the fluid have changed; therefore, when calculating the pressure drop, it is necessary to take into account the properties of the actual medium flowing through the heat exchanger, that is, the properties of water. .
In the shell side, steam and condensate exist in a combined state; there is no situation where there is only condensate or only steam, so both must be taken into consideration
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This post was last edited by bluishice on 2024-5-24 08:29. In the case of a vertical heat exchanger, the bottom should be filled with pure condensate water. Estimate the height of the condensate water separately, accounting for both water and vapor.
This post was last edited by lupg on 2024-5-26 09:39. There is a phase change in the shell process; when using program calculations, select “Condensation” in the “Phase” option, and the program will calculate automatically, showing the parameter changes during the condensation process in the results