When does a heat exchanger have the lowest energy consumption?
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Is the lowest energy consumption of the heat exchanger achieved when the temperature difference between the cold stream outlet and the hot stream outlet is smallest?
The original intention of the poster might have been to refer to the time when the heat exchange efficiency is highest
Well, I was wrong; it’s when the heat exchanger has its highest efficiency
It is best when the heat exchange area is just sufficient to achieve the desired heat exchange effect
When logistics for import and export are exactly the same, the energy consumption of the heat exchanger is at its lowest, equal to zero.
You can try using exergy analysis to evaluate it
It should refer to the [heat exchange efficiency of the heat exchanger]
It’s mentioned in the principles of chemical engineering; check the book, in the section on the number of heat transfer units – (MCp)min should be able to reach the limit temperature
Perhaps it should be asked this way: when does the heat exchanger system lose the least amount of useful work? **It is advisable to carry out heat exchange step by step as much as possible, ensuring that the temperature difference between the cold and hot streams is not too large.