Brief analysis on the economic benefit of bas

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Brief analysis on the economic benefits of building automation system (BAS) Abstract: This paper expounds the obvious advantages and remarkable economic benefits of BAS system by analyzing the causes of energy saving in building automation system. Without my permission, no other periodicals can reprint

key words: building automation system significant advantages energy saving economic benefits Untitled Document preface building automation system (BAS) is a high-tech building management system developed and gradually implemented in recent years, including advanced hardware system equipment and optimized software management thinking. Compared with the conventional management of building equipment in the past, It has obvious advantages and remarkable economic benefits. 1. Significant advantages of building automation system (BAS): bas monitors all the equipment in the building (including air conditioning, power transformation and distribution, water supply and drainage, elevator, lighting and other systems) and performs optimal control on the above equipment through calculation. Compared with the manual control system, the control system has significant advantages: 1.1 energy saving: after bas is adopted, the equipment management can evolve and optimize the energy-saving control of electric power, lighting, air conditioning and other equipment according to the pre arranged time program (such as office hours, holidays, day and night time, etc.). For example, the lighting system is controlled according to the procedures of office hours, which is the opening of Zui common equipment in the plastic mixing laboratory. According to the cooling load of the air conditioner, the opening status of the refrigerator and related water pumps is adjusted to achieve optimal control. 1.2 management cost saving: after bas is adopted, the original manual management can be completely replaced. Corresponding management expenses, such as personnel salary, welfare, housing, office environment and expenses, can be saved. 1.3 prolong the service life of equipment: the equipment managed by bas can be controlled completely according to the performance of the equipment, and there will be no equipment damage caused by misoperation, There will be no long-term overload operation, etc "Aircraft weight reduction can save fuel cost and damage the equipment, so that the equipment can operate stably in the optimal state for a long time. 1.4 improve management reliability: bas can improve the reliability of the management system, and there will be no negligence fatigue and misjudgment due to manual management, and these problems will often bring incalculable economic losses to the owner. 1.5 standardize the management system: bas itself can be based on management The Convention controls the equipment automatically. It has the ability to automatically analyze personnel management instructions, making some non-standard management standardized. 2. The economic benefit of bas is calculated by taking an ordinary building with 20 floors and a building area of about 20000 square meters as an example. The total investment of the building is about 100million. If bas is adopted, the equipment to be added includes operation station, network controller, direct digital controller, etc. the increased quantity depends on the number of equipment to be controlled. If there is no special requirement, the bas project investment should be about 700000-1000000, accounting for about 0.8% of the total project investment. The benefit analysis of bas is as follows: 2.1 direct economic benefit: the building automation system mainly monitors the power (1) formulation of policies and measures, lighting, air conditioning, water supply and drainage, elevators, etc. 2.1.1. power and lighting system: safe and reliable power supply is a prerequisite for intelligent buildings. Building automation system (BAS) can be used to monitor the status of switches and transformers, current, voltage, power and other parameters of the system, so as to realize comprehensive energy management and achieve the effect of energy saving. Lighting systems consume a lot of energy, which is often second only to heating, ventilation and air conditioning (HVAC) systems in large buildings. The building automation system (BAS) can determine the program on the calendar of the operation station in advance, distinguish between "working" and "non working" time, and use the program to set the light on/off time. In addition, by using key switch, infrared ray, ultrasonic measurement and other methods, the lamp can be turned off automatically within 5 minutes after people leave the room. According to the analysis report of foreign countries, the lighting control according to the above design scheme can save about 30% of the lighting power. After bas is adopted in the lighting system, the power consumption can be reduced by more than 30% compared with that without bas. If 1million kilowatt hours are used every year, 300000 kilowatt hours can be directly saved every year, with an economic value of about 200000. This single item can recover the investment in BAS system within 4-5 years. 2.1.2 air conditioning and cold and heat source system: air conditioning and cold and heat source are the most energy consuming items in buildings. On the premise of providing a comfortable temperature and humidity environment, building automation system (BAS) can reduce energy consumption in buildings and prolong the service life of equipment. The specific energy-saving measures are as follows: A. try to shorten the operation time of cold and heat source equipment such as refrigerator, reduce the number of operating units and output power, avoid the reactive operation of equipment, and make the cold and heat source system in the best energy-saving operation state; b. In the process of air treatment, the cold and heat shall not offset each other, and the fresh air shall be used to maximize the use of fresh air; c. Control technologies such as variable air volume and variable water volume are used to realize the best state point control and the best start and stop time control of water pumps and fans, so as to reduce energy consumption; d. For the air-conditioning objects that do not work with continuous reading, the working time, non working set value and control target value are automatically changed to realize energy-saving control; e. It adopts advanced control software such as adaptive control and fuzzy control principle to automatically change the set value of indoor temperature and humidity, improve the control accuracy, and achieve the purpose of energy saving. For example, the maximum temperature in summer is generally required to be no more than 26 ℃, and the control accuracy of the conventional air conditioning system is plus or minus 1 ℃, so the set value should be 25 ℃; If the control accuracy is plus or minus 0.5 ℃, the value of setting the connecting rod 1 end to be movably connected to the eccentric plate can be increased to 25.5 ℃. When the set value is increased by 1 ℃, the cooling capacity can be saved by 8%. Compared with conventional control, central monitoring can greatly improve the control accuracy. Generally speaking, compared with conventional air conditioning control, central monitoring can save about 20~30% of cooling capacity in terms of improving control accuracy, which is of great significance for reducing operating costs and saving energy. F. The service life of the equipment can be extended by reducing the reactive operation of the equipment, automatically recording the operation time of various equipment, and prompting the regular maintenance time. 2.2. indirect economic benefits because bas adopts optimal control to ensure that the equipment operates in the optimal state, it can greatly improve the service life of the equipment and reduce the accident rate caused by the negligence of personnel management. The indirect economic benefits brought by this can not be quantitatively estimated, but they are more considerable. 3 buildings using building automation system (BAS) system can provide a comfortable and pleasant environment: Nowadays, the conventional control systems of air conditioning in many buildings do not meet the health requirements and often become infectious diseases

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