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Operation and management of air conditioning automatic control systems in clean workshops and dust-free workshops
2025/11/12
The automatic control system for purification air conditioning automatically controls the temperature, relative humidity, and cleanliness of the indoor air, providing the conditions of temperature, humidity, and cleanliness required for the purification area, and ensuring that the air quality meets the purification standards needed for the purification area. This ensures the quality of the clean environment as well as human health and safety, etc.
Classification of air conditioning automatic control systemsThe control systems frequently used in the automatic control of central air conditioning mainly include the following types:
The features of this system are as follows: Through switches, contactors, relays, etc., the air conditioning equipment can be started and stopped remotely. Meanwhile, by setting indicator signs, the current operating status of the equipment can be displayed. Strictly speaking, this kind of system cannot be called a control system because it does not form a strict closed loop and has no feedback. It can only reflect the operating status of the equipment based on the conditions of the on-site instruments. In case of faults or when the temperature, humidity and pressure difference are not up to standard, manual adjustment is required and it cannot be automatically controlled.
2) Analog instrument automatic control system
The principle is that data is collected by on-site sensors and transmitted to the controller. The controller compares the collected data with the set data. If there is a deviation, the signal is transmitted to the actuator, which controls the opening and closing of the corresponding switch or valve to keep the controlled parameters within the specified range.
3) Direct digital control system
The automatic control of multiple units is accomplished by using DDC controllers, hardware facilities such as field sensors and actuators, as well as their operating system control software packages. It is equipped with complete control software, which can control the start and stop of the air conditioning unit, display the operating status, manual and automatic status, fault alarm, and control the frequency converter. Air duct filter blockage alarm; The opening degree control and status display of the water valves in the cold and hot coil units in the air duct, humidification control, electric heating control, return air valve control, etc.
4) Distributed control system
The distributed control system is a decentralized integrated control system based on microprocessors. This system integrates computer, instrument and electrical control technologies. Combined with corresponding software, it can achieve functions such as automatic data collection and processing, process picture display, parameter over-limit alarm, equipment fault alarm and report printing. It can continuously monitor the operating status of fans, filters, etc. Collect relevant parameters such as temperature, humidity and pressure, and form historical trend records of the main process parameters for easy viewing at any time. Safety operation levels have also been set, which not only facilitates management but also makes the system operation safer and more reliable.
The air conditioning system operates according to working conditions. Therefore, the automatic control system should include a part for automatic conversion of working conditions. If the surface cooler works in summer, control the amount of cold water and adjust the indoor temperature. However, in winter, it needs to be switched to the heater to control the heat medium and adjust the temperature. This is the basic working condition conversion. In addition, control the conversion of working conditions should be carried out from the perspective of energy conservation.
For air conditioning systems that operate throughout the year, the application of working condition treatment methods can achieve the goal of energy conservation. In order to minimize the cancellation of cold and heat during the air treatment process, fully utilize the fresh air and return air, and bring out the potential of the air treatment equipment, in addition to considering the automatic regulation mainly based on temperature and humidity, it is also necessary to take into account the control of the automatic conversion of working conditions that are matched with it.
Trends in air conditioning automatic control management
1) Environmental protection and energy conservation direction
The increasing demand for clean environments has led to the improvement of the management level of purification air conditioning systems, which in turn has promoted the further development of clean air conditioning automatic control systems. The installation of the purification air conditioning system is mainly aimed at meeting the purification and temperature and humidity requirements of the purification area. However, in today's environment where energy is tight and environmental protection requirements are high, as the energy consumption of air conditioning systems accounts for a high proportion of the total energy consumption of hospitals, air conditioning systems should make greater improvements in terms of environmental protection and energy conservation. The diversification of energy sources nowadays, such as the application of solar energy and geothermal energy, provides a fundamental support for air conditioning systems in terms of energy conservation. However, how to maximize the utilization and optimization of these energy sources in the application of air conditioning systems cannot do without the role of automatic control systems. How to solve the optimization of the utilization of new energy and composite energy, as well as the recovery of some energy and the improvement of fan efficiency and other issues, if the current problems can be well addressed, the HVAC automatic control system will have a broader development situation with the deepening of energy conservation and emission reduction in hospitals.
2) Centralized control
The development direction of air conditioning automatic control systems is either large-scale systems such as (building control systems) or small-scale systems (mechatronics). Both have certain advantages. As for large-scale systems, they are characterized by good universality, strong management capabilities, and strong overall system optimization functions. The small system has the characteristics of strong targeting and flexible use. Therefore, this has also become a controversial point in the industry for many years.
The distributed control system is a development trend. It not only integrates the air conditioning system, electrical system and corresponding systems into one system for management, but also plays a very important role in the optimization of the system and the improvement of management level.
With the development of science and technology, people and production have increasingly higher requirements for air temperature, humidity, wind speed and cleanliness, etc. At the same time, the issue of environmental protection and energy conservation has also received more and more attention. By understanding the automatic control system of air conditioners and integrating it with the world's advanced automatic control technologies, we can vigorously promote the development of clean air conditioning in domestic hospitals.
