How does the intelligent building management system work?
At present, the integration methods of intelligent building management systems in the world include subsystem integration mode and controller integration mode, and select appropriate integration methods according to actual needs. The management of intelligent building systems requires the coordination of various subsystems to achieve the safety and reliability of intelligent buildings.
central aircon system
According to the time schedule of the personnel in the building, reasonable settings are made to start and stop the chiller and heat exchanger in advance to meet the required pre-cooling and utilization of the air conditioning system. When the sensor transmits the measured temperature to the system, the system will perform corresponding PID adjustment to control the number of start and stop of the air conditioning system unit, avoiding waste of energy, and extending the life of the equipment.
For the monitoring of the floor air handling unit, it is necessary to take necessary monitoring measures to make reasonable start-up settings for the fresh air treatment unit according to the time schedule and temperature requirements of different seasons. If humidification is required, the steam of the fresh air treatment unit is started. Humidification function.
For the monitoring of floor fan coils, the start and stop times are also set according to the specific time requirements. If it is the intersection of two seasons, if the indoor temperature is higher than the outdoor temperature, then the new wind treatment unit should be started directly without opening. After the unit is started, the fan coil is started, which has achieved the effect of indoor cooling. Floor floor exhaust fan monitoring should set the appropriate opening time of the corresponding roof bathroom exhaust fan group to ensure the ventilation of the bathroom on each floor.
In addition, there is a basement air blower unit, which is normally open to ensure proper ventilation of the basement and cooling effect. For the exhaust fan unit of the garage, there are strict requirements, and two-speed control is required. When the vehicle volume is not large, it can be set to a low-speed gear position, and when the vehicle volume is large, it is set to a high-speed gear position.
The total power of the office is turned on at a fixed time before the working hours, and the power is turned off after the work is turned off. At this time, the system will set a delay to cut off the power. In this way, even if the user forgets to turn off the light source switch, the illumination will be automatically turned off within a predetermined time, without manual operation by the manager, which greatly saves manpower operation and saves energy.
The lighting of the stairwell is also a problem that needs to be considered in the automation of the lighting system. The lighting opening time is set in advance according to the working hours, and the system will also turn off the switch periodically during the off-hours. When an emergency story occurs, the system can achieve forced opening of the stairwell lighting to ensure the normal supply of lighting.
The public lighting should be controlled in layers. The closing time of the public lighting is set according to the commute, and the lighting equipment of each floor is turned off at the specified time. In order to facilitate the security inspection of the building, the security system should be linked with the lighting system. When the security inspection is conducted, the lighting of the corresponding position is automatically opened according to the position of the security guard.
In addition, the control of outdoor lighting should also be added to the system control range, and the switching time of the outdoor lighting equipment should be set according to the working time to achieve energy saving and beautification.
Power supply and distribution system control and monitoring
The control and monitoring of high-voltage power distribution systems is the most important in power supply and distribution systems, directly related to the safety and stability of power supply and distribution systems. It is necessary to carefully monitor the three-phase voltage, three-phase current, frequency, active power, and reactive power of the high-voltage incoming line. When the above value exceeds the limit value, it should automatically alarm and make every alarm record.
Not only that, but also real-time monitoring and monitoring of the vacuum circuit breaker switching state and tripping state of the high-voltage switchgear, and monitoring records to ensure the safe and stable operation of the high-voltage power distribution system. Real-time monitoring of the operating state of the cooling fan and the three temperatures of the transformer are recorded.
In addition, the system is also required to monitor the three-way current and three-way voltage, active power and reactive power data of the low-voltage two-way incoming line. When the data exceeds the limit value, the system can automatically send out an alarm signal.
In addition, the system should be able to monitor the operation of the auxiliary equipment in real time. Monitoring of data such as active energy measurement, as well as recording of floor switch cabinets, etc.
Escalator and elevator monitoring
As special equipment, the monitoring of escalators and elevators is very important. The stability of elevator operation is directly related to the personal safety of personnel, so it should be given high attention. When installing an elevator, a qualified elevator company should provide the interface required for monitoring. The intelligent control of the escalator mainly includes the elevator switch, the fault alarm, the call for help alarm, and the central display of the elevator position.
There is also elevator security monitoring, usually using a computer card reader to monitor the personnel entering and leaving the elevator in real time, but to meet certain confidentiality requirements, a specific computer card and input surface are required to enter the security system and the elevator control system. The voucher arrives at the designated floor. The security system should record the identity of the cardholder and the specific time of entry and exit in real time.
Fire alarm system linkage
When a fire occurs in the building, the fire protection system will issue a fire alarm signal for the first time. When the building central management system receives the alarm signal from the large fire protection system, it will be linked to the fire-fighting system, such as closing the floor fan coil. Open the underground parking lighting, turn off the floor to send the fan and other operations. The fire registration system linkage includes a series of actions of the fire pump and the water tank, such as the switch signal of the water pump, the water level display of the fire water tank, and the fire pump fault alarm.
In the event of a fire, the relevant circuit control system will be cut off. A corresponding fire short-circuit control cabinet will be set up in the fire control center area to initiate the disconnect function in time when the fire occurs. When the control module receives the signal from the fire control center, The non-firefighting load and the fan controlled by the non-building central management system will stop running. Under the control of the fire control command, the relevant monitoring/control fan will also stop operation and ensure maximum safety.
The pressure system of the fire protection system is the key to ensuring fire safety. When an abnormal situation occurs, the pressure fan of the fire stairs will be started after receiving the fire signal. A pressure sensor is placed at the bottom of each fire stairs to Connected with the electric control valve, the pressure in the building will wait for the corresponding control to meet the requirements of the fire system for normal operation. In addition, the fire room stair chamber pressurization system must be able to ensure that the pressurizing fan is activated in the event of a fire, and the fire dampers required for fire protection should be installed on each floor of the fire stair.
The contacts used to activate the electric fire damper are provided by the fire control center. In the event of a fire, the contact signal is sent to the junction of two adjacent floors, and the electric fire damper is activated for the first time. The fan exhaust system should also be activated in time in the event of a fire. A smoke evacuation valve is installed at the inlet of the exhaust fan. When the temperature of the flue gas exceeds 280 degrees Celsius, the exhaust fire damper will be automatically closed.
Security system alarm linkage
Security system alarm linkage is an important part of the intelligent building system. Its main function is to provide alarm zone signals and linkage between the central management system and the security system. Computer card reader systems and security alerts are the two main components of the security alert system, which include analog displays, BAS systems, and intelligent controllers. In combination with actual needs, the system supplier will provide the corresponding card reader and coded signals. It is worth noting that a separate central workstation needs to be prepared for security.
In order to ensure the full function of the security system, the security system is required to maintain good compatibility with other systems in order to achieve its chain, alarm, monitoring and other functions. In addition, there are security alarm devices and IC card access control. The former mainly includes magnetic switch door, push door alarm lock, help button, camera, etc. The security intelligent alarm controller is connected with the above device and transmitted to the analog display through the bus.
The IC access control card mainly restricts the illegally transmitted personnel. When someone illegally breaks in, the system will issue an alarm and set up remote control electric doors and walkie-talkies in some rooms with special needs.
In short, the management of intelligent building systems is a very complex system work, which requires scientific management of various subsystems, including central air conditioning systems, lighting systems, power supply and distribution system control and monitoring, escalators and elevators. Monitoring, fire alarm system linkage, security system alarm linkage, etc., can ensure the safe and stable operation of the building intelligent system.