| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系 === 106 === The constant temperature and humidity system is an important tool for detecting changes in performance and parameters of various materials, products, and foods under different temperature and humidity conditions.The temperature and humidity control requirements of the constant temperature and humidity system must be accurate and stable. The programmable logic controller(PLC) has high performance, high stability and powerful control functions in the field of automatic control. In order to test the effectiveness of membrane dehumidification in the air conditioning environment, this study will create a membrane test environment air conditioning chamber using a PLC controller and a PID controller as a temperature and humidity control system controls. By changing the output power of the heater and humidifier, the temperature and humidity of the closed environment are controlled, and the environmental information collected by the temperature and humidity sensors is displayed and recorded on the human machine interface(HMI) so that the user can instantly understand and monitor the environment. situation. In this study, the PID parameters of the PID controller were adjusted and experimented, and the control effects obtained under different PID parameter settings were explored. It was found that using Auto-tuning (A1) and PID parameters obtained by using Auto-tuning under the set temperature and humidity conditions (A2) and applying the same set of PID parameters under different temperature and humidity conditions(A0), although it can reach the constant temperature constant humidity, but the transient response of the control process is poor. The reason is that the P.I.D parameter setting is not good, and the (A3) experiment is performed by adjusting the P.I.D parameter setting. The experimental results show that lowering the P value and increasing the I value can enable the experiment to reach the target temperature faster, and the steady-state time for entering the constant temperature and humidity state is shortened without generating too large overshoot and steady state error. The membrane test environment air conditioning chamber produced in this study achieved the best temperature and humidity control effect.
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