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First of all, let’s look at the current status of building automation applications: According to relevant experts and network statistics, the situation of building automation applications is mixed.
1. Hi: The scope of application continues to expand. With people’s understanding of the role of building automation, the objects of use have expanded from the original public buildings to residential buildings.
2. Sorrow: The use condition is not satisfactory, some users abandoned it due to the high difficulty of use and poor maintenance; some have poor actual use effect due to unreasonable design; some have long-term lack of functions due to the long supply cycle of spare parts; …
So, how to build a building automation that can perform design functions and can be used for a long time?
“The rationality of the design; the suitability of the product; the standardization of construction; the convenience of use” are several elements for the effective function of the building automation system.
How to control each link of the above elements to achieve the best use effect?
How to design a satisfactory and suitable system for users
1. Design ideas:
The design must first comprehensively consider the user’s building use characteristics, management requirements characteristics, and equipment and facilities characteristics.
1) Features of building use:
The scope of use and management purposes of building automation are different for different buildings. For example, residential buildings may only monitor and control some lighting, exhaust, sewage wells, drainage pumps, elevators and other equipment and facilities. The purpose of management is usually to avoid risks and reduce labor intensity.
Another example is office buildings in public buildings. In addition to monitoring the above-mentioned equipment, it also pays attention to the management of the cold and heat source equipment of the central air-conditioning, the fresh air unit, the air-conditioning unit, and the power distribution facilities. The main purpose of management is to save energy, reduce labor costs, reduce operating costs, and avoid risks. Other types of public buildings will also have different management concerns and management goals.
2) Management demand characteristics:
Some users only want to dynamically grasp the status of equipment and facilities, and may only monitor but not control; some users are concerned about reducing operating costs and want to achieve scientific management of the equipment, which requires comprehensive monitoring; and some users may be somewhere in between. The equipment and facilities are monitored, and some equipment is only monitored but not controlled.
3) Features of equipment and facilities:
As we all know, equipment of different principles has different control methods, and the number of physical points and I/O types involved may also be different. For example, the monitoring physical points of ordinary asynchronous fans and variable frequency fans in blower and exhaust fans are obviously different (this table only shows that For illustration, not the only control mode of the fan)
Fan type operation failure manual automatic frequency feedback frequency conversion control work control conditions start and stop
Ordinary fan DI DI DI–DI DO
Inverter fan DI DI DI AI AO DI/AI DO
2. Design process and main points
Therefore, when we get the case, we can first consider how to design from the above three aspects.
After the designer learns that the building is a residential building, or a certain type of public building, such as hospitals, office buildings, theaters, shopping malls, etc., they should obtain the required management scope and management objectives from the bidding documents or the user, and then from the hydropower and wind drawings Obtain information such as equipment characteristics and the number of equipment and facilities.
Based on this information, the designer can start to design the point table, equipment configuration and related drawings, mainly including:
1) The monitoring point type (DI, DO, AI, AO or protocol) and the number of monitoring points of each controlled device.
2) Monitor the quantity and specifications of sensing equipment and actuators required by each controlled device.
3) Select DDC module specifications and design building automation system equipment configuration according to the number and type of monitoring points.
4) Design the system diagram according to the building structure and equipment distribution.
5) Prepare design instructions and technical solutions based on the above design (in the design instructions and technical solutions, pay attention to describing the interface requirements of the controlled equipment and the functions that can be achieved by the design (including the functions that can be realized by the software))
Remarks: The interface requirements can prevent the design function from being unable to be realized because the controlled device has no interface during implementation.
What elements should be paid attention to when choosing a product when designing?
How to choose a product satisfactory to both the engineering contractor and the user
1. The elements of choosing a product:
Choosing a product is nothing more than a comprehensive consideration of brand, price, service, quality, function and performance.
So should we consider the factors in different order and weight in the face of differences? The answer is yes.
Therefore, we can consider the idea of selecting products from several perspectives such as the type of building, the nature of the user, and the management needs:
1) High-end users: Usually high-end public buildings invested by high-end users may give priority to brands. Then we should respect the ideas of users and choose some high-end brands.
2) Ordinary users: Most users may pay more attention to product services and cost performance. The reason is simple: the effective life cycle of a building automation system is about 6-10 years. According to experience, most building automation hardware equipment fails due to quality problems The probability is very low, and the building automation server and software parts have a high probability of failure due to factors such as operators or viruses. Therefore, the timeliness and simplicity of product services (especially the software part) are particularly important.
2. Ideas for choosing products
Therefore, when most designers choose products, they will choose from:
1) Performance and function: whether it meets user requirements.
2) Quality: Can the system be used normally in 6-10 years?
3) Service timeliness: Whether the product supplier can provide services in a timely manner.
4) Convenience of system maintenance: Whether the system maintenance is simple or not.
5) Spare parts supply cycle: In case of failure, whether spare parts are provided in a timely manner can ensure that the system functions are not missing.
6) Price and brand: to ensure that the interests of users are maximized and the brand is easily accepted by users in all aspects.
7) Product added value: Does the product have additional functions that are helpful for management other than the conventional building automation functions.
Of course, good design and suitable products cannot fully guarantee that the system can operate well during the effective life cycle, and the implementation process is also very important.
How to implement building automation system
1. Elements in implementation:
1) The cable parameters must meet the standard: because the current cable material is more serious, the impedance and capacitive reactance of some cables are seriously not up to the standard, which will affect the signal transmission.
2) Construction should be standardized: It should be implemented in accordance with the relevant intelligent system construction specifications, the main equipment should be fixed firmly, the wiring should be firm, and the certain tensile standard should be met.
3) The network structure should be reasonable: it should conform to the system design and product communication technology specifications. If the product adopts industrial control bus technology, the network must be laid out according to the bus structure, and cannot be made into a free topology structure.
4) The signal test must be rigorous: the I/O access signal test on the DDC module must be performed to confirm that it conforms to the port design function. The communication function test between the DDC modules and the upper computer should be confirmed to be stable and reliable.
Reasonable design, suitable products, and standardized construction have basically ensured that the project has a good foundation. With the help of training for users and good after-sales service, the building automation system must be able to maximize its effect.
Great help you build a building automation system that satisfies users
1. GREAT building automation positioning
Small and medium-sized public buildings.
Industrial buildings in various industrial parks.
Residential districts of all sizes and grades.
2. GREAT building automation system composition
It is composed of on-site controller, network equipment, and host computer management platform.
3. Benefits of Great Intelligent DIY building automation system
1) Reduce users’ dependence on product vendors and effectively reduce service costs.
2) After the user finds out the experience, he can implement and adjust the operation by himself without the help of the product vendor to obtain the best effect.
4. The features of Great Smart DIY building automation system
GREAT building automation system DIY is divided into two parts:
1) GREAT building automation system hardware equipment configuration DIY.
The system hardware provides an object-oriented open environment, and users can freely compile and download the control plan from the computer on-site (including reconfiguration of network addresses and parameters, downloading applications, reporting network problems, and starting/stopping/resetting equipment applications).
2) GREAT building automation system host computer management platform configuration DIY.
System host computer management platform configuration, change the configuration configuration mode of general building automation system, adopt DIY configuration mode, configuration configuration is extremely easy: the user drags the equipment graphic to the plan in the design interface, and then enters the DDC number and enters each The status of the port number, the system will report that the configuration is complete, and the wiring table can be automatically generated after all the devices are towed and input.
As shown in Figure 1:
The upper computer management platform of the system adopts the CS architecture, that is, the server + client configuration mode, which can be configured with multiple clients, or it can run on a single machine. As shown in Figure 2:
The upper computer management platform has powerful functions:
real time monitoring;
Alarm list
Plan editor
Maintenance reminder
Energy management
Query print
The system structure fault query is all available.
As shown in Figure 3:
Great company provides users with a mature and advanced building automation system that is easy to implement, easy to operate, powerful, low implementation cost, low service cost, and multi-customer management.
5. Great users
Since its introduction to the market in 2001, Great Building Automation has already had more than 200 projects.
Project users include: Forte Real Estate, Greenland Real Estate, Gemdale Real Estate, China Resources Real Estate, Ruihong Real Estate, Wharf Real Estate, Huamin Real Estate, Gubei Group, Sanxiang Group, Lujiazui Development Corporation, Agribusiness Real Estate, Spreadtrum Group, Pengxin Group, Shanghai Real Estate, Zhongda Real Estate, Wanbo Real Estate and so on.
The project involves areas: office buildings, schools, factories, residences, commercial streets, shopping malls, hospitals, rail transit facilities, Expo venues, etc.
Geographic coverage of the project: Shanghai, Zhejiang, Jiangsu, Shandong, Sichuan, Chongqing and other places.
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