Intelligent building engineering system
Building automatic control system
System overview
The building automatic control system will collect and control the signal of the electromechanical equipment of the whole building, and realize the automation of the equipment management system. It aims to centrally manage and monitor the fresh air, ventilation, water supply and drainage and power system of the air conditioning in the building, so as to meet the strict requirements of the users for the environmental conditions such as temperature and ventilation in the building. Create a comfortable building environment at the same time to achieve the effect of both service and energy.
The main purpose of the building automation system is to analyze, classify, process and judge the information of various mechanical and electrical equipment in the building, and use the optimal control means to centrally monitor and manage the system equipment, so that the subsystem equipment is always in an orderly, cooperative, efficient and orderly state. In creating an efficient, comfortable and safe working environment, reduce the cost of each system, save energy consumption and daily management costs as much as possible, ensure the full operation of the system, ensure the needs of the special production environment, save energy 20%, save manpower, and maximize the purpose of safe extension of equipment life. Thus improve the high level of modern management and service of intelligent buildings, so that the investment can get a good return.
Demand analysis
The construction of building automatic control system needs to fully reflect the advanced technology, the professional nature of the system, the complexity of the function, the feasibility of investment, the practicability of construction and other special professional requirements of the construction of weak current system, to ensure the smooth implementation of the construction of the building and the normal operation on schedule.
The building automatic control system can automatically receive the statistics and equipment status information (normal, fault and alarm) uploaded by each DDC controller, and can record, print, analyze and manage. It can complete the function integration, realize the interface and interlock control with the fire alarm system, intelligent lighting, monitoring and alarm system, and interface with other related workstations, and cooperate with the integrator to build a successful and perfect property management center.
Designed for the building Automatic control system (BAS) of a building. According to the characteristics of the project, aiming at the technical requirements of the construction equipment monitoring system and system integration, focusing on the advanced control concept and open intelligent building structure, according to the relevant domestic and foreign advanced successful cases and relevant design norms and combined with our years of practical experience in the construction equipment monitoring system and system integration, The use of today's mainstream computer technology and automatic control technology to design. The building automatic control system is equipped with a set of management software and a client management workstation, which is located in the fire control monitoring center on the first floor to complete the monitoring and management of air supply and exhaust, water supply and drainage in the building. The gateway interface of the air-cooled heat pump unit, the gateway interface of the elevator/escalator system, the diesel power generation system and the gateway of the high and low voltage transformer and distribution system are integrated through the communication gateway to achieve secondary monitoring. The system collects, records, and saves important information and data about the system to achieve integrated management, to improve operation efficiency, ensure the control of regional environmental needs, save energy, save manpower, and maximize the purpose of safely extending the life of the equipment.
System design
The system adopts a three-layer network structure: management integration layer, field control layer and field equipment layer.
Management integration layer: mainly composed of a central graphical operation station, system server (main station), client (administrator workstation), etc., completely based on TCP/IP&BACnet, its main role is to manage and control the entire system, and can achieve data networking between different regions; At the same time, the management layer also supports the Client/Server and Web data access operations. The communication rate can reach 100M bps. This layer network is based on TCP/IP&BACnet, mainly composed of central station and router of application system. The central workstation system is composed of PC host, color large-screen display and printer. It is the core of BAS system, and it can be directly connected with Ethernet. The mechanical and electrical equipment monitored in the whole building is centrally managed and displayed here, the system operating software is installed, and the operator is provided with a number of simple and intuitive operation and use functions such as drop-down menu, man-machine dialogue, three-dimensional color dynamic data graphic display. To provide users with a very good, simple and easy to learn system operation interface, the operator does not need any experience and software knowledge, you can manage the entire automatic control system through mouse and keyboard operation.
Field control layer: It is composed of field control bus supported by DDC controller and expansion module, which is mainly used to monitor scattered field electromechanical equipment.
Field equipment layer: mainly composed of various types of sensors and actuators, complete to provide DDC with the measurement of the field environment and signal acquisition, receive the action execution instructions issued by DDC and implement.
The required controlled equipment can be effectively monitored in the operation workstation, and the operator can understand the operation of the controlled equipment in the building at a glance. The system operation workstation displays the graphics and text in two ways, and can change the display mode freely according to the usage habit.
Design performance requirement
comfort
The emphasis of building functions on the comfort of indoor environment requires the control management system to control and adjust the building equipment with high precision, so as to provide the most comfortable temperature and humidity to meet the needs of use. Building equipment control system according to the seasons, personnel and air flow changes, the indoor temperature in each area is controlled in the design requirements of the value, while referring to the international general standards, so that the building inside the building environment to achieve the most appropriate.
energy saving
Under the premise of satisfying the comfort, the building equipment control system organizes the operation of equipment reasonably, so that the operating cost of various equipment in the building is minimum. That is to optimize the system control with the lowest energy consumption as the control goal.
The building equipment control system software has an energy saving program to control the proper operation of the equipment. For example, according to the time program to control the opening of the air supply and exhaust system, according to the indoor CO² concentration to control the new air volume, according to the indoor and outdoor temperature and humidity to control the air valve switch to achieve optimal control.
Through a variety of management software, optimization control software and energy-saving software to achieve automatic control, in order to reduce energy consumption, with the energy-saving operation of the automatic control system, reduce unnecessary energy waste. And provide preventive maintenance on the hardware, and make advance maintenance for possible equipment problems.
Safe and reliable
If the mechanical and electrical equipment in the building suddenly fails and stops, it will have serious consequences. Building equipment control system can prevent this situation from the following aspects:
Check the actual load and rated load of the equipment at any time, once the equipment is overloaded, it will be automatically unloaded immediately and send an alarm signal to the central control room to prevent damage to valuable equipment;
Monitor the operation of the equipment, once one of the equipment is found abnormal operation, immediately alarm to notify the maintenance personnel to check, in order to prevent a wider range of equipment failure;
Automatically record the cumulative operating hours of the equipment. When the cumulative value reaches the specified maintenance time, it will automatically report to the central control room and remind the equipment to be repaired in time.
When one of the equipment in the group fails and cannot continue to operate, it automatically switches to the standby equipment;
In the case of temporary power failure, after the power supply is restored, the system automatically executes the sequential startup procedure to ensure the smooth operation of the equipment and avoid damage to the equipment due to startup failure.
Through these detection, alarm and treatment methods, the building has effective prevention means for the sudden failure of mechanical and electrical equipment to ensure the safety of equipment and property.
