Basic concept and development direction of buildin

2022-08-22
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Basic concept and development direction of intelligent building management system

building intelligent control system (or building management system ba system) is a network system composed of central management station, various DDC controllers, various sensors and actuators, which can complete a variety of control and management functions. It is an intelligent control and management network developed with the application of computer in environmental control. At present, the various components of the system have developed from the past non standardized design and production to standardized and professional products, so that the design, installation and expansion of the system are more convenient and flexible, the operation of the system is more reliable, and the investment is greatly reduced

II. Introduction to building management system structure

1 Why in advanced comprehensive buildings, shopping malls, hotels or production plants, it is necessary to have a perfect central management and automatic control system

(1) it can provide a kind of auxiliary motor indirect speed change device for central overall monitoring, which can immediately detect and analyze electromechanical equipment faults, reduce other problems caused by small faults, avoid improper operation and equipment damage, and save time and money at the same time

(2) cooperate with the energy-saving program operation of the automatic control system to reduce unnecessary energy waste and achieve an average saving of 5-15%

(3) provide preventive maintenance and repair possible equipment problems in advance

(4) improve the overall management efficiency of buildings and save manpower and time

(5) the hierarchical network monitoring system can fully control regional buildings and plants, achieve the effect of intelligent decentralized management, improve the ability of energy distribution and use and fault maintenance, and reduce the maintenance costs of staff and electromechanical equipment

(6) in contrast, the required central management system investment can be recovered in a short time

2. Advantages of centralized and decentralized management system

(1) decentralized intelligent network, advanced design, reduce the impact of faults, so as to improve reliability

(2) open system design, which can be compatible with different system software: - central cooling capacity and electricity billing system - substation system monitoring instrument with software compatibility - Electromechanical equipment condition display screen

(3) the main intelligent controllers can operate completely independently to reduce the impact on operation due to network faults

(4) provide different types of controllers for use with various electromechanical equipment, ideally from 12 points to 296 points

(5) the manual/automatic switch control is improved, including the required controllers and valves, so the inconvenience to users caused by system failure is reduced, and debugging and maintenance are provided

(6) it can provide extra large memory capacity that will not disappear. In terms of program, single data processing can be adopted to reduce the chance of error and operate simply

(7) it can be connected to high-speed Ethernet or remote communication to expand the network monitoring range

(8) ensure the compatibility of the old and new design system versions, ensure that users do not need to spend a lot of money due to technical updates, and ensure that the average electrolyte used per kWh 15 years ago is 608l. The system is used on the same communication line with the latest system

(9) it can provide perfect after-sales service

the system mainly monitors electromechanical equipment

(1) central air conditioning - automatic control of refrigerator room - fresh air and air conditioners - main air supply and exhaust fans - partition on/off monitoring of air conditioning system - central air conditioning billing system

(2) water supply/drainage equipment

(3) partition of public lighting system layered on/off monitoring

(4) substation system monitoring - high voltage and distribution monitoring - analog monitoring of the power supply of the whole building through power transmitters

(5) Escalator and elevator monitoring

(6) fire protection system alarm monitoring

(7) boiler room and hot water supply monitoring system

(8) anti theft system

system network combination is the most ideal use of advanced technology with multi-layer network structure, which greatly improves the reliability and technical level of the system

(1) high level network:

includes the central graphics and management computer workstation, which can enter the Ethernet for large-scale data management, and the workstation has Langer management software

(2) middle level network:

workstations communicate and control with independent modular field controllers through the same layer bus sharing. Each set must be able to communicate independently and operate by itself

(3) local area network (LAN):

independent modular controller can provide local area to communicate with smaller independent industrial application controller, achieving decentralized intelligent monitoring effect and high temperature control accuracy

(4) sensors, transmitters and drivers monitor and control through input and output signals

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