The purpose of heat exchanger network optimization
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Dear HaiChuan friends, I am participating in a chemical engineering design competition and have many questions regarding heat exchange networks. When I get a heat exchange network generated automatically for a given system, I’m not sure how to optimize it – should I remove those sections with insufficient heat exchange area? It’s still necessary to minimize the total cost. Why does the total cost of the target increase after optimization for some projects? Should we still optimize the logistics that go through the pinch points? Why are all 5 pairs of temperatures in my heat exchange network referred to as hot pinch (cold pinch)? I hope everyone can share their opinions and insights; let’s help each other improve. . . .
Optimization aims either to minimize cost or to minimize the heat exchange area. Optimization may not be able to completely eliminate logistics across junction points, but heat exchange across junction points will definitely not occur in the target scenario. 5 pairs are process pinch, the others are utility pinch
Expert, I’m a beginner in heat exchanger networks. I have a question I’d like to ask for advice on. My project relates to cryogenic air separation, and the heat exchanger network I’ve designed requires only one type of utility stream; in other words, it’s a case without any pinch points. What should I do in this situation? Another issue is that the system analysis indicates the presence of pinch points, but these pinch points are caused by the utility streams. If I remove that water-cooling stream, it again becomes a case without any pinch points. Additionally, the analysis suggests the use of a utility stream at -290°C, but such a thing doesn’t exist in reality. What should I do now? I hope an expert can give me some guidance. Thank you
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