Heat exchanger
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Under what circumstances should the inlet of the cooling medium in the heat exchanger and the outlet of the material be controlled in this way? How is the switching between PW and MBW controlled at this time? What are the advantages of such control?
The cooling media are PW and MBW, and the material side is PL, right? First, the flow rate of the cooling medium is controlled by the temperature at the material outlet; this is a conventional control method, right? Secondly, regarding the cooling medium, whether to use PW or MBW, the diagram indicates that the choice is made based on the inlet temperature of the cooling medium. It might be a temperature-based step control: use PW below a certain temperature, and use MBW above that temperature. This control method needs to be understood on the basis of understanding the manufacturing process. There are many similar control methods; it’s nothing unusual.
If the outlet temperature of the material is too high, shouldn’t the flow rate of the cooling medium be increased? However, the inlet ratios of the cooling medium MBW and PW remain constant – how can adjustment be achieved? Can’t it control the material outlet temperature?