At the same time, the heat generated by subway trains and a large number of passengers is the main factor affecting the thermal environment of subway platforms and tunnels, which makes the subway temperature increase year by year. If it is not controlled, it will become a public hazard, which is a worldwide problem. The cost of using air conditioning equipment to dissipate heat and cool down is very high, the operating cost is very high, and it is a serious waste of energy. Tsinghua Tongfang's designers adopted cold storage technology and rationally configured ventilation equipment (fans, etc.). ) is controlled by a microcomputer. Using ventilation system instead of air conditioning system not only has less investment and good effect, but also effectively solves the problem of temperature rise.
Compared with public transportation on the ground, subway usually has longer operation lines and more equipment, which requires higher operation mode and management. At the same time, there are few vents inside and outside the subway, few entrances and exits, and large passenger flow, which makes it difficult to evacuate people. Once a fire breaks out, if it cannot be ventilated in time and effectively controlled, it will lead to great disaster. Therefore, intelligent environmental monitoring system should have disaster prevention function.
After receiving the fire alarm signal, the subway BAS system can automatically switch the operation state of electromechanical equipment to the disaster state and start the disaster mode. When the train temporarily stops in the tunnel due to an accident and cannot enter the platform, the system can also ensure ventilation in the tunnel by starting the emergency state to ensure sufficient oxygen in the carriage.
In addition, the solution also includes automatic equipment management and fault diagnosis, which can establish various mechanical and electrical equipment file databases in the station, automatically accumulate equipment running time, arrange equipment maintenance and repair plans, and record various maintenance conditions; For key equipment, real-time fault diagnosis can also be carried out to prevent problems before they happen.
Energy-saving is another major feature of BAS system in subway, that is, considering all kinds of factors affecting the load of air conditioning and ventilation system, automatically adjusting the annual operation mode of air conditioning and ventilation system according to the changing law of subway thermal environment, and adjusting the ventilation volume of fans through frequency conversion according to the real-time load change, which can achieve remarkable energy-saving effect.
In the subway BAS system solution, a series of advanced software technologies are adopted to ensure the application effect. Among them, the main software systems are subway environment simulation and prediction software, subway air conditioning and ventilation system optimization control software, subway equipment operation management software EuMs, equipment fault diagnosis software FaDs, fire analysis and smoke treatment software EaSs.
EnCs is an optimal control software for subway air conditioning and ventilation, which includes two parts: optimal control of tunnel ventilation system and optimal control of station air conditioning system. The purpose of optimal control is to reduce the energy consumption of fans, pumps and units as much as possible and save operating costs on the premise of meeting the environmental control requirements of the system. There are two main modes for subway ventilation system: open-loop control mode and closed-loop control mode.
EuMs, a subway equipment operation management software, can enhance the system management function of BAS system and improve the control decision-making level and emergency response capability. Use EUMS software to count the running time and faults of fans, pumps, escalators, elevators and other equipment, and make maintenance plans. The equipment management software EUMS has an equipment management database, which automatically records and counts the running status of each equipment, accumulates running time, automatically arranges maintenance plans (and avoids simultaneous maintenance of spare equipment), and records maintenance information. The software runs under the control of analysis and application scheduling software. According to the preset method, the files about mechanical and electrical equipment are established in the computer hard disk, and the start-stop time, fault situation, accumulated running time and maintenance situation of each equipment are recorded, and the maintenance plan is arranged regularly according to this information.