Intelligent building system detection method?

What are the detection methods of intelligent building system? The following Zhong Da consults the bidding teacher to answer your questions for your reference.

Intelligent building uses advanced computer technology, control technology and communication technology to provide users and managers with a building automation system (BA system for short) with perfect control function, convenient data processing, centralized display operation and safe and reliable operation. Building automation system uses distributed control technology to monitor building equipment comprehensively and in real time, which improves the running quality of building equipment, reduces the management workload and building energy consumption, and plays an important role in building intelligent system. But for a long time, the quality of BA system engineering in China is poor, and few BA systems are put into operation normally. The main reason is that the testing and acceptance of BA system engineering is not based on science.

In the past three years, in order to cooperate with the government and the owners in the completion and acceptance of the intelligent system project, we have tested the BA system of Shanghai Jiushi Fuxing Building, Post and Telecommunications Training Building, Shanghai Tongmao Building, Volkswagen Building, Shanghai Pudong Development Bank Bund 12 Building, Zhaofeng Global Building, Zhaofeng World Trade Building and Securities Building. The power supply system, cold and heat source system, air conditioning system, lighting system, water supply and drainage system and garage management system under the supervision of BA system are tested, and the real-time, reliability, safety, operability, maintainability and control accuracy of BA system are evaluated as important indicators of the system. This work has promoted the BA system engineering contractor to make efforts to rectify and improve the engineering quality, and not only achieved good social benefits, but also the work results have been included in the draft of Shanghai intelligent building series standards.

Discussion on detection method of 1, BA system

The testing work of BA system should first comprehensively understand the functions and performance indexes of the whole system according to the engineering design documents and contract technical documents. The main documents to be provided by the owner and engineering contractor of the tested system include system selection demonstration, system scale and capacity, control process description, system function description and performance index, BA system structure diagram, control schematic diagram of each subsystem, BA system equipment layout and wiring diagram, electrical schematic diagram of distribution box related to BA system monitoring, field equipment installation diagram, monitoring process program flow diagram of DDC station and central management workstation, operator station, central control room equipment layout diagram, BA system supply contract and engineering contract, and BA system construction quality inspection record. On this basis, according to the acceptance standard of BA system, a set of reasonable BA system inspection scheme is formulated.

Detection is generally divided into three levels: central monitoring station, subsystem (DDC station) and field equipment (sensors, receivers, actuators, etc.). ) for functional testing.

1. 1 central monitoring station detection

The central monitoring station is a central processing equipment, which is responsible for collecting, refreshing, controlling and alarming the DDC station data of each subsystem in the building. The items tested are as follows:

Observe the change of site status on the central monitoring station, whether the status data on the screen of the central monitoring station is constantly refreshed and its response time;

Control the analog output or digital output from the system through the central monitoring station, and observe whether the field actuator or object acts correctly and effectively and the time when the action response returns to the central monitoring station;

When the input side of DDC station makes a fault artificially, observe whether there is alarm fault data record on the screen of the central monitoring station, and give the sound prompt and its response time;

Whether the central monitoring station can automatically restore all monitoring and management functions after the power failure of the central monitoring station is restored;

Check whether the central monitoring station gives the operator operation authority to ensure the safety of BA system. Should confirm the rejection of illegal operation or ultra vires operation;

Whether the man-machine interface is in Chinese, check and control the equipment status through the screen of the central monitoring station, and observe whether the equipment operation and defense process are intuitive and convenient, so as to confirm the friendliness of the interface;

Detecting whether the central monitoring station has the state self-diagnosis function of the equipment group;

Whether the display and printer of the monitoring station of the testing center can provide information such as running time, area, quantity and status of all or important equipment in the form of report graphics and trend charts;

Check whether the system provides software tools for system design, application and drawing;

Check whether the parameters of the controlled object set by the central monitoring station are consistent with the design accuracy with the object parameters measured on site;

Check whether the running status data of each equipment displayed by the monitoring station of the center is complete and accurate.

Detection of 1.2 subsystem

The subsystem (DDC station) is a computer monitoring system that can run independently. It collects, calculates, controls and alarms the process signals of various sensors and transmitters on site, and transmits them to the database of the central monitoring station (upper computer) through the communication network, and the central monitoring station displays, controls, alarms and prints them in real time.

The items of the detection subsystem are as follows:

Manually stop the central monitoring station and observe whether each subsystem (DDC station) can work normally;

After the manual manufacturing subsystem (DDC station) loses power and restores power supply, whether the subsystem can automatically restore the running state set before the power loss;

Whether the communication network between the artificial manufacturing subsystem (DDC station) and the central monitoring station is interrupted, whether the field equipment is in normal automatic operation state, and whether the central monitoring station is registered with the DDC station high-speed line fault alarm signal;

Check whether the clock of the subsystem (DDC station) is synchronized with the clock of the central monitoring station, so that the central monitoring station can monitor all kinds of subsystems (DDC station).

1.3 field equipment inspection

According to the requirements of system design and monitoring, electrical signals are divided into analog and switching values. Sensors and transmitters are devices that convert various physical quantities (temperature, humidity, pressure difference, flow rate, electric valve opening, liquid level, voltage and current, power, power factor, operating state, etc.). ) into corresponding electrical signals. The actuator is a device that works according to the control signal output by DDC. The inspection items of field equipment are as follows:

Check whether the installation of field sensors, transmitters, actuators and DDC boxes is standardized, reasonable and easy to maintain;

Check whether the data and status displayed by the central monitoring station are consistent with the readings and status on site;

Check whether the action or action sequence of the actuator is consistent with the design process;

Whether to generate an alarm signal when the parameters exceed the allowable range;

Whether the action of the actuator under the control of the central monitoring station is normal.

1.4 function detection

The monitoring of building equipment by BA system is usually completed by function and area. Therefore, the detection function is also performed by region. Take the fields of air conditioning and public lighting as examples. Air-conditioned areas are places where people work and rest. Under the control of BA system, the air conditioning system should ensure comfortable indoor temperature and good air quality. The test items for air conditioning and public lighting areas are as follows:

Check whether the central monitoring station can control the air conditioning system according to schedule;

Detecting whether the temperature and humidity in the air-conditioned area are consistent with the data displayed by the central monitoring station;

Check whether the indoor carbon dioxide content meets the hygiene standards;

Check whether the lights in the public lighting area can be switched on and off according to the time program and set up night lighting to achieve the purpose of energy saving.

Through the detection of the above three levels and functions, we can comprehensively evaluate the real-time, reliability, safety, operability, maintainability, installation quality and control accuracy of BA system, and put forward rectification suggestions for existing problems. After rectification, the tested BA system can realize the function of normal operation.

Many problems will always be found in the engineering inspection of BA system. After a certain period of rectification, most BA systems basically meet the functions and technical indicators listed in engineering design documents and contract technology, and the system runs well, which can achieve certain energy-saving effects. Qualified BA system is effective in monitoring construction equipment, and has fast real-time response to detection, control and alarm. The operation interface has high localization rate, convenient operation and maintenance, and comprehensive equipment management conditions; The system strictly controls the operator's authority and has distinct levels; The system works reliably; The control accuracy of air conditioning area can meet the design requirements of air conditioning.

There are usually some problems in BA system testing, the main reasons are as follows:

First, a few designers majoring in architecture, heating, ventilation and electricity did not cooperate well in the initial design, which led to the space of air-conditioning box room being too small and the equipment maintenance channel being difficult to walk. Or the location of fresh air outlet is unreasonable and the quality of fresh air is not ideal.

Secondly, some BA designers are not familiar with the integrity of building equipment and systems, which leads to the wrong sensor location equipment, and even the system lacks suitable sensors and software tools.

Thirdly, a few BA designers don't fully understand the operating conditions and technology of the air conditioning system, which leads to the unreasonable control mode of the air conditioning system by BA system and fails to achieve the effective energy-saving goal.

Fourth, some construction workers did not operate according to the specifications during the equipment installation process, such as wiring errors, sensor installation position errors, weak connection between actuators and equipment, wiring of DDC box due to civil strife, unprotected rubber pads at the inlet and outlet of the box, and random pulling of metal hoses, which brought hidden dangers to the normal operation of the system.

Fifth, a few property management companies failed to carry out necessary maintenance in the operation of BA system, which led to the constant failure of the original normal system.

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