System curves with recycle lines

I remember learning about recycle lines in one of my process engineering courses, but it was primarily about mass & component mass balances. I also recall having to iterate to arrive at steady state. When someone asked me about system curves for systems with recycles (pressure drop in recycle lines), I had to do some thinking on how to go about generating one . This was the result. Link to the sheet where I construct all graphs in the video: https://docs.google.com/spreadsheets/d/1XZoeNc8yi2c4ZY6048JqSQsaXo88TkTf/edit?usp=sharing&ouid=115819202667741836420&rtpof=true&sd=true 00:00 Different systems and different system curves 01:13 Which flow do we mean? 04:01 How I deal with heat exchangers 05:21 System curves for each individual portion 06:33 Pressures at different points 10:41 Using the Solver add-in for Excel 12:42 Finally, the system curve Link to sheet with the example I work through: https://docs.google.com/spreadsheets/d/1TyrVT-f1cp7jSQitS5eubmwBVkSVcrzm0kXJICT9Cww/edit?usp=sharing Process with Pat is the place to come for perspective and to ask stupid questions. I want you to leave more knowledgeable, confident, motivated, and most importantly, curious. I also want to invigorate a field that seems tired and uninspiring, at least if you get your perspective from internet forums. These are not lectures. This is a place for you to leave thinking “Oh! That’s why...” This channel is not only for chemical engineers - anyone who works with processes should be able to find something of value here. #ProcessEngineering #ChemicalEngineering #ProcesswithPat