【 Weak current College 】 intelligent building building automation system design

Description: this paper introduces the building automation system, main design steps and the last system integration.
Keywords: intelligent building automation system

As computer technology, control technology, communication technology and the rapid development of information technology, life, Office of environment, safety, comfort, and the growing demand for intelligent building came into being. Intelligent building typically contains three basic elements, namely the building automation system (BAS), communications, the combination of the three, so that the building is able to provide a fair, efficient, comfortable, safe and convenient living and working environment. Among them, building automatic control system of intelligent building is an important component.
Building automatic control system is on the building in a variety of mechanical and electrical facility for full computer monitoring and management, such as air conditioning and refrigeration systems, water supply and drainage systems, power transformation and distribution system, lighting system, elevators, fire fighting and security system; the individual subsystems for monitoring, control and information record for decentralized energy control and centralized management for building the user provide a good working environment, to building managers provide a convenient means of management, reducing the energy consumption of buildings and reduce management costs.
Building automatic control system such as shown below.
1 building automatic control system design steps
Building automatic control system design is often divided into several steps.
1.1 project needs analysis (1) the use of buildings, to understand the specific needs of the owners, as well as the expectations of the target; (2) determining the building automation control and management of various functional subsystems; (3) according to the various functions of the subsystem contains equipment, produce desired into the building automation system implementation monitoring and management of charged device list.
1.2 systems control scheme (1) the need for automated control of functional subsystem, giving a detailed description of the control functions, and describes each system control program and achieve the purpose of the control to guide Project installation, scheduling and project acceptance; (2) according to the system generally scale and future development, identify the monitoring center location and area; and reservation interface and intelligent systems design to form a harmonious unity.
1.3 determine system monitoring points
In determining the number of accused of equipment and the corresponding control programmes, identifying each charged device monitoring points and control points and control points of nature, approved the implementation of the specified control point for monitoring technical feasibility, draw a list of monitoring point.
1.4 system and equipment selection (1) system selection should be comprehensive technical, economic indicators, a comprehensive and objective analysis to compare and select the appropriate field test of the product; (2) equipment selection combination equipment types of floor plan, monitoring points classification (monitoring points should have a margin of 20 per cent); under the monitoring range, the systems network architecture and system software; (3) under the control of the device, choose the corresponding sensors, valves and actuators, and equipped to meet the requirements of the sector controller.
1.5 draw BAS total control network diagram
According to the selected system structure and the specific field of building equipment layout and draw the BAS total control of the network map.
1.6 draw various subsystems charged device control schematics
1.7 draw the entire building automatic control system message duration floor plan
1.8 control center design and layout
1.9 provides design construction notes, lists the materials table
2 electrical control system design
Distribution SCADA system is the heart of the building, is building momentum in the system. If you do not have a distribution system, all the electromechanical equipment will not work. Therefore, the distribution system is the most important part of the building. Transformation and distribution monitoring system in addition to ensure that the building power system normal operation, you can greatly improve the efficiency of the energy consumption. In addition, many buildings are equipped with the appropriate emergency power source, such as diesel generator set, when the power is no electricity, a standby diesel generator started automatically and put into operation, ensure that the load of normal power.
Now building is equipped with two transformers and a diesel generator sets, the design is as follows:
2.1 charged equipment list
System device name quantity units notes
Electrical power distribution box 2 distribution room
Transformers 2
Diesel generator 1
2.2 distribution monitoring system main settings features: (1) test run parameters, such as voltage, current, power, transformers temperature, normal operation of the measure, at the time of the accident reason analysis of failures; (2) monitor the operational status of the electrical equipment, such as high and low-voltage wire circuit breakers and other types of switching current, in-State, whether or not to run correctly, such as fault found, auto alarm; (3) on all devices in the building of power consumption for records and statistics, including power electricity and lighting, peak load, power consumption, the average power consumption in Japan, and other indicators for analysis and management; (4) on a variety of electrical equipment repair, maintenance, maintenance management.
2.3 system monitoring point list
List of monitoring points
Control point description type a device name
－－－－－－－－－－－－－－－－－－－－－－－－－－
High temperature alarm AIAODIDO transformer
Current 1 x 2 AC current transducer
Voltage of 1 × 2 AC voltage transducer
Active power 1 × 2 active power transmitter
Power 1 × 2 power transmitter
Power factor 1 × 2 power factor transducer
The main circuit status 1 × 10
Total 10 12
> Intelligent node control box configuration HW-B5941BHW-BA5942B LV distribution intelligent node control box the one
Battery voltage 1
Generator start and stop 1 × 2
Status monitoring and alarm 1 × 2
Tank oil level 1
2 4-total
Intelligent node control box configuration: HW-B5943B backup power supply intelligent node controller
2.4 selection
According to HW-BA5000 building automation control system, selected HW-BA5941B, HW-BA5942B LV distribution intelligent nodes, control box, a desk and HW-BA5943B backup power supply intelligent node controller one.
2.5 draw BAS total control of the network map. 2.6 draw electrical control schematics
DI promise of digital input
DO promise of digital output
AI analog input
AO analog output
Field sensors and actuators are joined by a line in intelligent control box i/o terminals, the signal line cable, power cord RVS-2×1.5MM2 BV-2×MM2. The controller has a modular design, is equipped with two standard RL-45 interface that can be used to connect to the network monitor, network form LON bus structure, and LonWords bus network is connected to a class of twisted pair.
Of course, the above design steps by just various subsystems meet itself features require the necessary monitoring and control system design, there is a historian of important parts of the system of integration, it constitutes an interrelated, concerted, integrated unified whole. Specifically, to achieve the building of water, electricity, fire, security, and other equipment for comprehensive monitoring and management, using computer network and interface technology will be scattered in various subsystems in different floors direct digital controller, through networking implementation in all subjects central monitoring and management-level computer and communication of information between the subsystem is a set of distributed intelligent control system, the system is configured as a traditional distributed system-level network, three-tier network of concepts, system all the control and management of equipment through LonWords field bus connection with the various control devices for point-to-point communication, peer-based communications network.