(1) Experimental Research Method on Manual Control Process of a Constant Temperature and Humidity Test Chamber
In this study, a constant temperature and humidity test chamber (http://) was selected as the experimental subject. When the automatic control system was not installed, manual operations were conducted to regulate the chamber’s environment through processes such as humidification, heating, and exhaust. The main data recorded during these operations included the operating time, internal temperature, internal humidity, exhaust air flow rate, exhaust air velocity, ambient temperature, and ambient humidity. These records helped understand the behavior of the system under manual control, which served as a foundation for further research.
(2) Establishing an Adaptive Inverse Control Model
Based on the experimental data collected, the research method involved analyzing the results from both single-factor and multi-factor experiments. Through nonlinear fitting techniques, a mathematical model of the temperature and humidity control process was developed. Since the temperature and humidity control process is inherently complex, involving multiple variables, large time delays, and nonlinear characteristics, it was necessary to linearize and decouple the model, while also compensating for the time lag. This step was crucial for designing an effective control system. The study aimed to apply the inverse control method for multivariable nonlinear systems to refine the process control model, making it more accurate and responsive.
(3) Research Method for Developing a Constant Temperature and Humidity Test Chamber
Using the adaptive inverse control model established in the previous section, a new constant temperature and humidity test chamber was developed. The equipment primarily consists of a refrigeration system, a heating system, a dehumidification system, a humidification system, a water tank, and a wet box. It also includes a main control unit. The system is equipped with a PLC and a temperature and humidity controller, serving as the automation platform. Additional components include temperature and humidity sensors, a touch screen, and solid-state relays, forming a complete electric control system for the test chamber.
The temperature and humidity sensors measure the induced voltage, which is directly connected to the controller. Based on the adaptive inverse control model, the system outputs a linear voltage ranging from -10V to control the heating system. The PWM (Pulse Width Modulation) technique is used to regulate the solid-state relay based on calculated on-off frequency, adjusting the on-time of the humidification system’s switch. This ensures that the temperature and humidity inside the chamber remain stable and consistent throughout the testing process.
Combo emergency exit light that combines a 2x3W LED lamp with a 3W exit sign. The LED lamp provides bright and energy-efficient lighting in emergency situations, while the exit sign clearly indicates the way to safety. This product is designed to provide illumination and guidance during power outages or emergencies, ensuring that occupants can safely and quickly evacuate a building.
Combo Emergency Exit Light,Exit Light Combo,Exit Emergency Combo,Exit Emergency Light Combo
JIALINGHANG ELECTRONIC CO.,LTD. , https://www.jlhemergencylighting.com