Building automation system of Shenzhen SEG Plaza

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Shenzhen SEG Plaza building automation system

SEG Plaza is a landmark building in Shenzhen. A large number of high and new technologies compete to be applied here. Due to the limited space, this paper only summarizes the composition of SEG Plaza building automation system (BAS) and the control methods of main equipment. At the same time, in the use of property management, We have found some items that are neglected in the routine construction of BA system but are very important to property management. Here, we propose solutions for the reference of the industry

I. overview of SEG Plaza

SEG Plaza is located in Futian District, Shenzhen. It is known as the intersection of Shennan middle road and Huaqiang North, the "Diamond treasure land". It is the world's highest concrete-filled steel tube structure building. It adopts frame tube structure, covers an area of 9653m2, with a total construction area of 169833.8 m2, a building height of 291.6m, including a total height of 345.8m. The building has 76 floors, including 4 basement floors, It mainly consists of parking lots and equipment rooms. It has 72 floors above the ground. The first floor is a podium building. It has the largest electronic market in Asia. The upper 62 floors are office buildings, hotels and sightseeing floors. The 72nd floor is equipped with a helipad

the building has complete equipment and facilities, mainly including the following seven systems:

1 Fire fighting system

2. Power supply and distribution system

3. Air conditioning system

4. Water supply and drainage system

5. Elevator system

6. Intelligent system

7. Parking lot system

building automation system (BAS) is referred to as a central control monitoring system (CCMS) in essence. At present, it is mainly used in commercial and public buildings to provide various building equipment for efficient management and control. On site equipment can be divided into air conditioning system, cold and heat source system and water supply and drainage system. Centralized monitoring, management and control shall be implemented for the operation, safety status, energy use status and energy conservation management of many decentralized equipment such as power, lighting, elevator, fire protection and security systems

SEG Plaza BAS system adopts the most advanced TA Vista building control system of Swedish TAC automatic control company. TA Vista adopts open structure and Lon Works technology, modular design, adopts international standard lontalk communication protocol, and reduces 50%~80%2 carbon oxide emissions, that is, the communication protocol of the system is transparent to other users, leaving a lot of room for users' system integration and future system upgrading, expansion and transformation. In the SEG Plaza building, it is mainly distributed in the following 6 parts of each floor of the building, and many decentralized equipment are used for centralized control, management and monitoring

1) air conditioning and ventilation system 2) refrigeration system 3) water supply and drainage system 4) power transformation and distribution system 5) automatic elevator and lighting system 6) underground garage CO detection system

ta vista system provides a single user operation and management interface in SEG Plaza building. Users can manage the above systems of the whole building through a workstation in the central control room of the building, which can be displayed in text or graphics, And it can send instructions at the operation station

II. Structure and control method of Saige Plaza building automation system

the entire TA Vista building distributed control system network consists of two levels

the first level is the communication network between computers (Management) in the monitoring center, which supports MS Windows NT, Novell network and UNIX. Based on tcp/ip, the production communication protocol can be organized only after the problems of injection molding machine and mold are solved

the second level is between the system host and the monitoring sub station. The communication network between the sub stations adopts LonWorks network communication technology. In the peer-to-peer mode, the transmission speed of the control network lon bus is up to 1.25m

the bottom layer of the system is various sensors and control equipment, which transmit the field sent signals to the local controller through field wiring

the built-in communication unit pclta connects the xenta field direct controller (DD polyethylene plastic bag (its brittleness temperature is 7.0 ℃) to the TA xenta (longwork) network. Each user of TA Vista can control and monitor each DDC of the network, and the remote terminal can be connected to the network through the modem in the operating system. The communication medium between the systems adopts shielded twisted pair (UTP), and the distance between the host and the field controller can reach 2400m without signal amplifier

control method:

1. Refrigeration system

the monitoring of refrigeration system includes the detection and control of chilled water, cooling water system, cooling tower chiller and expansion water tank. TA vista system controls the start and stop of refrigeration system and monitors the working status of each equipment according to the time holiday program pre arranged every day

a) starting sequence

cooling tower cooling water valve cooling water pump chilled water valve cold feed water pump chiller; The shutdown sequence is opposite. The total chilled water pumps are in an equal and mutual backup relationship. When one fails, the standby equipment will be automatically put into use. The system will record the cumulative operation time of each equipment at the same time and automatically rank the average fatigue life of each equipment in a balanced manner. The startup and shutdown procedures of each linkage equipment include an adjustable delay time function to match the characteristics of each device in the refrigeration system

b) cooling load control

plus logic operation

the control program will compare the difference between the chilled water supply temperature of the system and the set value according to the sampling period. If the error exceeds the set value, the system will be ready to put into the next host to meet the needs of system load

minus logic operation

the control program will monitor the system load according to the sampling period. If the system load decreases, the system will automatically unload a host for operation to save system energy. Here, we take the difference between the return temperature of chilled water and the supply temperature (delta temp) as the reference value of the system cooling load

c) fault monitoring and recovery

when a fault occurs in the unit group, the control program will automatically switch the failed host to the faultless host. After troubleshooting, the host will re-enter the sequencing

d) cooling water temperature control

according to the return water temperature of the cooling tower and the operation status of the chiller, the system controls the start and stop of the cooling tower and the number of cooling water pumps, so as to save energy consumption

e) differential pressure control

automatically adjust the opening of the bypass valve according to the chilled water supply and return water pressure difference to maintain the constant supply and return water pressure difference. When the bypass flow reaches the flow of one pump, shut down one cooling water pump. When the total supply and return water pressure difference is lower than the set value, start the water pump to achieve variable control and realize the comprehensive energy saving of the refrigeration system

2. Air conditioning and ventilation system

a) air conditioning unit

ta Vista controls 216 cabinet air conditioners in the building

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