Research on building automatic control system of intelligent building?

With the continuous development and progress of China's construction industry, intelligent buildings have developed accordingly, in which automatic control system plays an extremely important role. This paper mainly analyzes the application of automatic control system in intelligent building.

1 preface

Building automation system plays a very important role in it. It has the following advantages: firstly, it can effectively save energy; Secondly, the equipment can be guaranteed to run in a safe range; Thirdly, it can create a safe working environment. These advantages make contemporary architecture develop into intelligent architecture and architecture that can think for human beings.

2 development of automatic control system

With the continuous development and progress of automatic control technology, the automatic control system in buildings has also been developed. In the development of China's construction industry, the building automation system has gone through the following stages. The first stage is centralized control system, the second stage is decentralized control system, the third stage is field bus control system, and the fourth stage is network integration system.

3 development trend of automatic control system

The concept of intelligent automatic control system, especially automatic control system with integrated ability, has not appeared for a long time. Therefore, in the discussion of system selection, there are often some arguments. Automatic control system is mainly produced by the combination of the following two aspects, the first is computer control technology, and the second is communication technology. Therefore, the automatic control system of the building will definitely adopt the latest research technology in the computer field.

Application of Automatic Control System in Building Engineering

4. 1 Project Overview Suzhou nanxi river Road Business Center is located in Wuzhong District, Suzhou City, with a total construction area of about120,000 square meters and a building height of 85.3 meters. Mainly has the following functions: First, commercial functions; Second, the function of office building; Third, the functions of five-star hotels; Fourth, underground parking. Among them, the building adopts automatic control system to achieve the purpose of intelligent management of buildings. The following mainly introduces the application of air conditioning energy consumption management system in buildings.

4.2 This design is based on national architectural design codes and standards, such as Code for Fire Protection Design of Buildings, Code for Lightning Protection Design, Code for Design Standards of Intelligent Buildings, Code for Design of Low-voltage Power Distribution, etc.

4.3 Design objectives

4.3. 1 primary equipment operation meets the design standards. "Primary equipment" refers to equipment that can reflect its use function, such as boilers, elevators, street lamps and other equipment that can be directly used by users. Building automatic control system controls similar equipment to serve users, so we can also call the equipment of automatic control system "secondary equipment". The main purpose of constructing automatic control system is to ensure that the operation of "primary equipment" meets the design requirements, and to ensure that nanxi river Road Commercial Center can obtain a comfortable working environment.

4.3.2 Reducing the energy consumption of equipment In contemporary building engineering, in order to meet the needs of users as much as possible, mechanical and electrical equipment occupies an increasingly important position in the building, and the energy consumption of these mechanical and electrical equipment is also the main part of the building operation expenditure. According to the investigation and study, the energy consumption of central air conditioning alone accounts for more than 40% in buildings, and adopting automatic control system in buildings is helpful to save energy consumption and operating funds.

4.3.3 Convenient Property Management In order to provide a more comfortable working environment for nanxi river Road Business Center Building, there must be a large number of mechanical and electrical equipment. However, due to the scattered distribution of these devices, it will bring great difficulty to the management of these devices. The use of automatic control system will help property managers to reduce the labor intensity of staff and realize the modernization of property management. For those frequently used devices, we can use computer time program management to control them.

4.4 Design principles

4.4. 1 A reasonable automatic control system can not only meet the needs of users, but also control nanxi river Road Commercial Center with the practicability of the system as the main goal.

4.4.2 Advanced design adopts the most advanced technology, which is convenient for tracking the future development of the industry.

4.4.3 Openness is not only compatible with other equipment monitoring, but also allows users to choose other systems for updating and maintenance.

4.4.4 Friendly Some systems are complex and need professional operators to operate and manage. The friendly feature of the software is that it is easy to use and convenient for staff to operate and manage.

4.5 System Principle This design adopts a new type of distributed control system, which distributes control functions to each control loop and reflects them in the field instruments, thus improving the reliability of the system and realizing distributed control. This system is divided into the following three levels, the first is the equipment layer, the second is the control layer, and the third is the management layer. The main monitoring objects are roughly divided into the following categories: the first category is PAU air conditioning system, the second category is water pump equipment, and the third category is elevator equipment. The monitoring of BA system of nanxi river Road Business Center Building is set in the monitoring center on the first floor. There are more than 30 air conditioning units in the building, of which 5 adopt frequency conversion units.

Generally speaking, the principle of VAV air conditioning is to use air supply sensor or return air sensor to control cold water and hot water regulating valves. At the same time, the electric heating of the air duct can be adjusted in stages as needed, and then a high-temperature protection switch is set. When the switch is activated, the electric heater needs to be turned off, and when the fan stops running, the electric two-way valve needs to be turned off. When controlling the combined air conditioner, the indoor temperature is used to control and adjust the electric two-way regulating valve for cold water and hot water.

Then a high temperature protection switch is set, and the switch is set behind the electric heater. When the switch operates, the power supply of the electric heater needs to be turned off, and when the fan is in a stopped state, the electric two-way valve needs to be turned off. It should be noted that the electric heater can only be turned on when the fan is turned on. When the resistance of the filter changes, the air volume can be maintained by controlling the frequency converter to ensure the stability of ventilation and prolong the service life of the filter.

4.6 The power supply of the power supply system is introduced from the control room distribution box with a capacity of 5kw for three phases. DDC digital controller is installed in each air-conditioning machine room, and the power supply is led out through the nearest distribution box, with a unidirectional capacity of 0.5kw.

4.7 Electrical Grounding In a building, the design of power supply and distribution is very important, which affects the effective use of the whole building. Among them, grounding system occupies a very important part, because it can have the most direct impact on the safe operation of power supply system. Especially in recent years, with the continuous progress and development of science and technology, the automatic control system in buildings has brought us great convenience and also produced some problems. TN-S system is adopted in nanxi river Road Business Center Building. When setting up the system, we should pay attention to the following problems: first, its working zero line, second, its special protection line, and third, their connection position, so as to ensure the safety of intelligent buildings.

5 conclusion

The automatic control system in the building plays an extremely important role in the intelligent building, which can realize the intelligent service of the whole building. The design and construction of intelligent buildings need the coordination of construction units, owners, design units and other units. By setting up an automatic control system in the building, it is helpful to realize the energy-saving effect of the whole building. In the future development of construction industry, the development of building automation system will become more and more mature.

The above research on building automation system of intelligent building was collected by Zhong Da Consulting Company.

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