Floor automatic control system (Building AutomaTIon System, BAS) involves a very wide range of contents, and equipment of a modern building is often involved. As the scale of new buildings continues to grow, the standards continue to be strict, the types and number of equipment have been greatly improved, and the system requires thousands of monitoring points. Its monitoring points are usually distributed on every floor and every corner of the building, so using decentralized management, local monitoring and manipulation consumes a lot of human resources and are sometimes difficult to do. BAS adopts developed computer and network technology to carry out centralized management and automatic monitoring of equipment, which is of critical significance for saving manpower and maintaining the daily operation of equipment. Use the computer system to start and stop all related equipment scientifically to prevent wasteful operation of the equipment, so that the system can operate more energy-saving. Therefore, the key goals of BAS system are: to improve the system management level; to effectively reduce the workload of operators; to save a lot of energy consumption; and to reduce labor and operation costs.
Constituent architecture
Building automatic control system consists of multiple devices connected through the network, namely the central management station, network controller, field controller, sensor, actuator and other equipment.
Cornwax IoT building automatic control system functional structure
uses a field controller to achieve intuitive monitoring and control of the internal power system, cold and heat source system, air conditioning system, air supply and exhaust system, lighting system, etc. of the building. The system uses the network structure of the management layer and the control layer, dynamic image control display software control station, network communication equipment relies on the management layer network connection, and uses a decentralized intelligent way to control the system. When any problem occurs at any point in the control layer network, it will not affect the normal operation of the overall system and the communication and transmission of information.
project information
A certain airport hotel is the main supporting project for passengers to rest for the night, and it is also the first five-star business and leisure hotel invested and built after a certain international airport is opened. The hotel has a total construction area of 58,000m2, and has 312 luxurious rooms, restaurants, banquet halls, etc. It also has accommodation, catering, banquets, leisure and other functions. The hotel is located between the T1 and T2 terminals. It takes 2 minutes to walk through the corridor inside. In order to facilitate passengers to travel, the restaurant and guest rooms are equipped with a consistent screen that displays flight information. The lobby has an boarding pass redemption self-service machine counter, which is a large-scale multi-purpose building that can reflect the new century buildings, electromechanical facilities, information systems, management systems, and overall functions. Hotel buildings should show the digital, networked and intelligent characteristics of today's society. In order to create a comfortable and convenient work and service environment, provide high-quality information management, and promote normal and safe operation, the hotel should have a building automation management system (BAS), and use computers, network communications and autonomous control technology to carry out automated monitoring and management of the electromechanical facilities in the building.
Because the building automatic control system in the total weak current system is related to the fields of water, electricity, wind, etc., and it is also the key reason for whether the weak current intelligent architecture can truly reflect its intelligence and dependability. Therefore, based on the high-demand application of hotel buildings, based on the specific functional requirements of the hotel, choose to use the building automatic control system.
solution
Based on the above analysis, the building automatic control system technology has been successfully applied to a certain airport hotel. The entire system consists of two levels: the central monitoring level and the on-site control level. It adopts decentralized control, centralized monitoring and management. The central monitoring machine is equipped with a management control station and computer output equipment. The main task is to monitor the entire system, data reserve, make tables, print and alarm, etc. The workstation uses color images to dynamically display the operation process and facility conditions, which is convenient for control and scientific management.
field control is realized through field digital controller. It can complete the management and adjustment of heat exchanger , air conditioner ventilation, exhaust and drainage and domestic water systems, and collect and control signals on the relevant electromechanical facilities of the entire building to achieve automation of the hotel floor facilities management system, and give full play to its functions of optimizing the operating quality of the equipment system, improving management level, reducing operation management workload, and saving energy consumption.
(1) Central management operation station system
Central management operation station system consists of a PC host, a display and a computer output device. The operating station is the center of the automatic control system. The electromechanical facilities monitored in the hotel are all displayed and managed here. The server device gives the operator a pull-down menu, human-computer dialogue, and three-dimensional dynamic display of images, providing users with a humanized page that is easy to manipulate. Operators can operate and manage the entire control system easily and quickly without mastering professional software knowledge.
(2) Monitoring points of the air conditioning unit system
: new air valve adjustment and valve position feedback, filter pressure difference alarm, water valve adjustment and position feedback, unit start and stop, operating status, manual and automatic status, fault problem alarm, fan pressure differential switch, air supply temperature inspection, return air valve opening and closing and position feedback, return air temperature inspection, air carbon dioxide concentration inspection, coil antifreeze switch.
control requirements:
① The system is equipped with a probe temperature sensor on the air supply and return pipelines of the air conditioner unit; according to the comparison of the returned air temperature measurement value and the set value, the opening of the hot and cold water valve is automatically adjusted in proportion to ensure that the air supply temperature meets the control requirements.
② Adjust the opening of the fresh air valve to ensure air quality according to the real-time collection value of the carbon dioxide concentration in the air.
③ The system is equipped with pressure differential switches on both ends of air conditioner filter . If the filter is dirty and accumulates to the preset pressure, the blocking alarm will be sent to the system host and the employee will be prompted to clean or replace it to ensure air quality.
④ The system remotely starts and stops the air conditioner unit, monitors and records the fan operation status, fault problem alarms and manual automatic status. If there is a problem with the on-site equipment, the system will continuously issue sound and image alarms and feed back to the monitoring page of the host, so that employees can find problems and analyze them in a timely manner.
⑤ The system can set up an early start unit, pre-cool and preheat the object space in advance, and the detailed schedule can be set according to the actual situation of the hotel. The system can superimpose the operating time of each unit, and at the same time summarize the operating time into a table output, which can provide reference for maintenance workers to conduct regular inspections.
⑥ Linkage control of fan, water valve switch and air valve switch, the air valve automatically opens the air valve before the fan is turned on, and when the fan is shut down, the air valve and water valve will be automatically closed in a delayed manner. When the outdoor temperature is as low as -5℃ in winter, the water valve will automatically maintain a 5% to 10% opening to protect the unit coils and prevent freezing and cracking.
(3) Exhaust system
monitoring points: fan opening and stopping, operating state, fan pressure differential switch, manual and automatic state, fault problem alarm.
control requirements: The system remotely starts and stops the air exhaust system and accumulates the operation time of the fan. The system records various parameters, status, alarm, start and stop time, as well as accumulated time and historical parameters, and uses the computer output device to output the operation diary.
(4) heat exchange system
monitoring point: secondary return water temperature of the heat exchanger, primary side water valve opening adjustment.
control requirements: configure the probe temperature sensor on the secondary return water path of the heat exchanger; according to the comparison of the temperature measurement value and the set value, the opening of the primary side water valve of the heat exchanger is automatically adjusted proportionally to ensure that the water supply temperature meets the control standards.
(5) Domestic water system
monitoring point: operating status, manual and automatic status, fault problem alarm; water level alarm for domestic water tank.
control requirements: display the operating status, manual and automatic status of the domestic water pump, and fault problem alarm messages on the host page; the system instantly monitors and displays the feedback status of the high and low liquid level of the domestic water tank and instantly alerts.
(6) Drainage system
monitoring point: collecting well float level status, submersible pump operating status, fault problem alarm information.
control requirements: If the water level of the water collection well is very high but the water pump is not turned on, an alarm signal will be sent to the host immediately.
Conclusion
After the building automatic control system was put into operation, the system has been running smoothly and has completed the pre-designed requirements. The system can effectively and automatically control the controlled facilities in the hotel, and at the same time, use software to carry out complete management of the facilities, so that the facilities can play a better role. It further improves the efficiency of use and scientifically controls the operating time and status of the facilities, thereby achieving the purpose of extending the service time of the facilities. The reduction of energy consumption is implemented, reducing the workload of operation and maintenance employees and reducing the operating costs of facilities while ensuring service quality. It can not only meet the environmental requirements of different areas of the hotel, but also reasonably allocate the operation of facilities and energy losses. Through advanced integrated monitoring and optimization control, the hotel's facilities management level is improved, providing the hotel with a safe and comfortable service and working environment.
As a domestic brand that has deeply cultivated the field of building automatic control , Cornwall IoT is born with the gene of "energy saving". Since its establishment, the company has been committed to achieving energy conservation and carbon reduction in buildings, and has actively participated in the energy conservation and carbon reduction cause. It has accumulated rich experience in the field of energy conservation in public buildings. Through its independently developed software and hardware products, it provides buildings with scientific and intelligent energy management solutions, empowers building energy management, and builds green buildings.
In response to market demand pain points, Cornwall IoT uses the advantages of automatic control technology, AI technology, IoT and other technical advantages. Through its independently developed software and hardware products, it takes smart lighting, building automatic control, IBMS, energy consumption management platform and other systems as the core, and empowers buildings with smart technology to help buildings save energy and reduce carbon.
In recent years, Cornwall IoT has actively responded to the national dual-carbon strategy, continuously built an independent innovation system, explored new paths for energy conservation in buildings, and continuously explored and practiced in public buildings such as offices, hotels, hospitals, culture and education, factories, transportation hubs, and large venues, actively promoted the development of my country's building energy conservation and the realization of dual-carbon goals.
