Selection of the temperature control point for indirect heating with heat transfer oil
Thread Content
I would like to ask everyone: when indirectly heating a medium using heat transfer oil, and given that the process requires control of the outlet temperature of the medium, which point is best to use for feedback control in order to achieve better system stability? Is it the temperature of the heat transfer oil or the outlet temperature of the medium? It would be best to provide reasons for this, thank you. My idea is something similar to a water bath: the heat exchange coil should be long enough to allow for precise temperature control of the heat transfer oil, thereby ensuring a constant outlet temperature for the medium.
We generally use the medium outlet temperature to control the flow rate of the heat transfer oil
Cascade control of heat transfer oil flow rate and outlet temperature
Hello, does the outlet temperature of the heat transfer oil need to be controlled? The heat transfer oil is heated by an electric heater; is it necessary to adjust the power of this electric heater in order to maintain a constant temperature of the heat transfer oil?
Hello, does the outlet temperature of the heat transfer oil need to be controlled? The heat transfer oil is heated by an electric heater; is it necessary to adjust the power of this electric heater in order to maintain a constant temperature of the heat transfer oil?
I haven’t used electric heating, but the principle is the same; the temperature of the heat transfer oil needs to be controlled
The temperature of the heat transfer oil needs to be controlled; the greater the variation in the temperature of the heat transfer oil, the greater the variation in the temperature at the outlet of the medium. The most stable approach is to use cascade control of electric power and the temperature of the heat transfer oil in order to maintain a constant temperature of the heat transfer oil, and to use cascade control of the flow rate of the heat transfer oil and the temperature at the outlet of the medium in order to keep the temperature at the outlet of the medium constant.
Yes, I think the same way: handshake
This post was last edited by Ku Liang Zhi Le on 2017-7-19 at 19:08. Alternative options: 1. Single-loop control system for the medium outlet temperature: The controlled variable is the medium outlet temperature, while the control variable is the flow rate of the heat transfer oil； 2. Cascade control system for medium outlet temperature and heat transfer oil flow rate: The primary controlled variable is the medium outlet temperature, the secondary controlled variable is the heat transfer oil flow rate, and the control variable is the heat transfer oil flow rate ； 3. Cascade control system for medium outlet temperature and heat transfer oil temperature: The primary controlled variable is the medium outlet temperature, the secondary controlled variable is the heat transfer oil temperature, and the control element is the electric heating of the heat transfer oil. Which specific solution to adopt depends on the requirements for quality control (control of dynamic quality and control accuracy) as well as the specific operating conditions.
Series control using the medium outlet temperature and the load of the heat transfer oil electric heater
If the requirements regarding the medium temperature are stringent, it is recommended to use the medium temperature as a reference point~~ Of course, alarms and interlocks should still be in place to handle high temperatures of the heat transfer oil~~