Regarding the convergence problem of rigorous HX in strict heat exchangers
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When using the rigorous heat exchanger rigorous HX for calculations, we often encounter non-convergence conditions. However, since it is not clear where the problem lies, it always takes a lot of time to debug. I hope everyone can summarize the conditions that cause the heat exchanger to not converge during the calculation process, so that we can brainstorm and save a lot of time in future actual calculations. :) This post was last edited by Haichuan Zhifeng on 2007-12-12 13:52 ]
I think the heat exchanger should be easier to converge than the column because it uses much fewer physical properties. I have also encountered situations where there is no convergence. Here is a rough summary:: 1 The hot and cold logistics settings are wrong (inverted). 2 The flow of refrigerant or heating medium is not enough. 3. The size of the equipment is not enough (or the size setting is improper, because there are many settings in the heat exchanger, but there are more settings in professional heat exchange software, and you cannot do it well if you are not familiar with the structure of the heat exchanger), the heat exchange area is small, or the heat transfer coefficient is not enough. Pay attention to the above points, and now the heat exchanger will not encounter non-convergence.
There are two kinds of things that are more common: 1) Pressure drop in two-phase system 2) Internal temperature of hot and cold flow PINCH when setting is not good
Whether the heat load, heat transfer area and thermal resistance meet the given conditions, that is, whether the heat is balanced