How Does Dual-loop Control Improve The Accuracy And Stability Of Temperature And Humidity Control

This angle of the question is crucial. Dual-loop control is the core of this type of temperature and humidity controller to achieve high-precision control. We can understand it from its working logic:

The two loops of the dual-loop temperature and humidity controller are generally responsible for temperature control and humidity control respectively. Each of the two loops has independent sensors, control units, and actuators:

• Temperature loop: Responsible for collecting ambient temperature data and controlling heating/cooling components, such as heaters and refrigeration compressors
• Humidity loop: Responsible for collecting ambient humidity data and controlling humidification/dehumidification components, such as humidifiers and dehumidifiersThis division of labor can avoid the mutual interference between temperature and humidity adjustment in single-loop control. For example, in single-loop control, adjusting humidity may accidentally change the temperature, and vice versa.

The two loops do not work completely independently, and there is a collaborative feedback mechanism:

• When one of the loops (such as the temperature loop) performs adjustment, it will synchronize the adjustment signal to the other loop. The humidity loop will adjust its own adjustment strategy in advance according to this signal. For example, when the temperature loop starts refrigeration, the humidity loop will predict that the air humidity may rise in advance and start dehumidification in advance
• This advance collaborative adjustment will reduce the probability of large fluctuations in temperature and humidity, and keep the ambient temperature and humidity within the target range at all times

A single-loop temperature and humidity controller can only handle the error of one parameter at the same time, while the dual loop can handle the errors of temperature and humidity at the same time:

• For example, if the environment has both high temperature and high humidity, the dual loop can start cooling and dehumidification at the same time to correct the deviations of the two parameters at the same time, instead of waiting for one parameter to be adjusted before adjusting the other
• This simultaneous correction capability will make the parameters return to the target value faster, and also reduce the secondary errors that occur during the waiting process