How to design a temperature control loop
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There is a material that condenses when the temperature is below 14 degrees Celsius, and may polymerize over time at temperatures above 30 degrees Celsius; therefore, it is necessary to maintain the temperature between 20 and 25 degrees Celsius. The circulating water used in the company’s utility systems has a temperature of 31–41 degrees Celsius, while the chilled water has a temperature of 7–12 degrees Celsius. It is necessary to use chilled water to cool the circulating water first, and then use the cooled circulating water to control the temperature of the material. Since it is not desired to use two separate temperature control circuits (one for cooling the circulating water with chilled water, and another for controlling the material’s temperature with the cooled circulating water), I would like to ask how it is possible to achieve the above functionality using just one temperature control circuit
Just connect the chilled water flow rate and the material temperature directly, and use the chilled water temperature/circulating water flow rate and temperature as disturbance parameters; having a design firm handle it will be straightforward
Personally, I think the temperature of the material being inspected could be used as a control parameter to directly regulate the flow rate of the cooling water – increasing the flow rate when the material’s temperature is high and reducing it when it is low. However, since this is an indirect form of control, it is necessary to ensure stability in the flow rate of the circulating water.
The chilled water temperature/circulating water flow rate and temperature can be used as disturbance parameters; could you provide more details on this? Learn* it a bit