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The Application of NA200 in Energy-Saving, Constant-Temperature, and Dehumidification Systems
Release date:
2020-03-31
In many industrial production processes, establishing a stable, constant-temperature dehumidification system is an essential and critical step to ensure smooth operations. While constant-temperature control technology is now relatively mature, achieving effective dehumidification under such conditions remains a complex task in terms of implementation. By leveraging the NA200 series PLC introduced by Nanda Aotuo Company, we can efficiently realize control for energy-saving, constant-temperature dehumidification systems.
In many industrial production processes, establishing a stable, constant-temperature dehumidification system is an essential and critical step to ensure smooth operations. While constant-temperature control technology is now relatively mature, achieving effective dehumidification under constant-temperature conditions remains a complex task in terms of implementation. By leveraging the NA200 series PLC introduced by Nanjing Aoto Company, we can efficiently realize control for energy-saving, constant-temperature dehumidification systems.
Hardware Configuration:
The entire system utilizes the NA200 series PLC and touch screens from Nanjing Aoto as its core control components. The PLC is connected to a host computer, enabling remote control and monitoring capabilities for the system. Meanwhile, temperature and humidity sensors detect the supply air’s temperature and humidity, and the controller, working in conjunction with actuators, precisely regulates the dehumidification chamber’s environmental conditions.
Control scheme:
(1) Temperature Control: The chiller and electric heater are controlled based on the return air temperature. If the actual temperature exceeds the controller’s setpoint, the chiller turns on; if the actual temperature falls below the setpoint, the chiller turns off, and the electric heater activates.
(2) Humidity Control: The dehumidifier is controlled based on the return air humidity. If the actual humidity exceeds the controller’s setpoint, the desiccant wheel activates; if the actual humidity falls below the setpoint, the desiccant wheel deactivates.
(3) Control of the regeneration fan and regeneration electric heater: The dehumidification performance of the dehumidifier is assessed based on the difference between the supply air humidity and the return air humidity. If this humidity difference is very small, it indicates good dehumidification performance, and the regeneration fan and regeneration electric heater can be activated. However, if the difference exceeds the set value, the regeneration electric heater is turned off first, followed by a delay before the regeneration fan is also shut down, allowing residual heat to dissipate effectively.
(4) Filter Monitoring: Install differential pressure switches on both the primary and secondary filters to monitor the dust collection efficiency of the filter media. Based on the pressure difference, determine whether the filters are clogged, and trigger an alarm on the controller to prompt immediate action.
(5) Fan Status Monitoring: Monitors the fan's operational status (e.g., on/off, normal/faulty), and provides appropriate protective measures based on the current operating conditions. If the fan stops or shuts down due to a fault, the controller triggers an alarm indicating the fan failure, simultaneously shutting down all controlled equipment immediately to safeguard the air conditioning unit.
(6) Air damper and fan interlock: When the fan runs, the air damper opens; when the fan stops, the air damper closes.
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Company Headquarters: No. 15, Building B, Zone B, Phase I, Headquarters Economic Park, 69 Fengzhan Road, Yuhuatai District, Nanjing, Jiangsu, P.R. China
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Aoto Technology Co., Ltd.
