What should be the appropriate outlet temperature after the saturated water vapor condenses in the heat exchanger?
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The inlet temperature of the saturated water vapor outside the tube is 220 degrees, while the inlet temperature of methanol inside the tube is 70 degrees; the outlet temperature is 200 degrees. What should be the appropriate outlet temperature after the water vapor condenses? How is the logarithmic mean temperature difference calculated at this point? How is the heat transfer coefficient calculated?
There are methods for calculation in chemical engineering principles; look above for detailed calculation procedures
If only methanol heating is considered, the outlet temperature after water vapor condensation is taken as the temperature at the moment of complete condensation. If energy savings are a concern, the outlet temperature after water vapor condensation is set around 70 degrees, but this requires a large heat exchange area; I usually choose a temperature of around 90 degrees in such cases. The logarithmic mean temperature difference and the heat transfer coefficient must be calculated separately for two stages: the latent heat stage and the sensible heat stage.
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