【 Weak current College 】 DDC (direct digital controller) introduction

DDC system introduction
What is DDC
DDC (DirectDigitalControl) means 「introduction direct digital control 」. In recent years, it replaces the traditional control components, such as a temperature switch, the receiving controller or other electronic machinery components, etc., into a variety of architectural and environmental control of common patterns. DDC system is the use of micro-signal processors to do perform a variety of logical control function, it mainly uses electronic drive, but you can also use the sensor connection pneumatic institutions.
All of the control logic consists of micro-signal processors, and is based on the controller, the controller receives a sensor, common integration points or other instrument sent to the input signal, and on the basis of the software programs handle these signals, then the output signal to an external device, these signals can be used to start or shut down the machine, open or close the valve or door, or press the program perform complex actions. These controllers available hand operating central machine system or Terminal system.

What is DDC Terminal system
A Terminal system is a mechanical system to service an integral part of a separate area, for example: a separate fan-coil controller, VAV controller, heat pump controller ... And so on. DDC Terminal is DDC applications. This is applied to a commercial building control industry developments, it can provide the entire building HVAC systems in action.

DDC Terminal system control level
Information processing and control of level depends on the form of equipment, such as VAV terminals, its operating system by setting the required heating or cooling airflow temperature set points, according to the air flow and set maximum minimum flow value, the operation can be set by a timetable, holiday schedule, the time allowed to ignore, such as fitted with exhaust temperature sensor bar, also according to the exhaust gas temperature. It can monitor each VAV fan run time and pipe heater work time.
Other Terminal system is similar, but differ on the impact of the system.

The main advantage of DDC system
Specialized use of the DDC system has many advantages, the following is a list of the most important points:
1. the operation:
Terminal DDC system is a powerful tool for the management of the building, its operating system can easily manage one or more positions, in a timely manner according to customer requirements or to respond to your request, DDC system allows the controller to manipulate time also have other functions, this is different from the traditional system. DDC system can be a single terminal access to the entire building operations of all of the information, which has very strong troubleshooting skills.
2. reduced fee:
A good design of DDC system can reduce energy and manpower costs. Since all regions by central dispatch and control through the transfer of energy and to not be wasted, and the system can automatically start or stop a mechanical device, so that it is not necessary, do not run. It can also automatically through the operation of a terminal diagnosis and treatment of many problems without the need for on-site maintenance personnel, eliminating many costs, reducing maintenance costs. At different locations in multiple buildings, can be used by a central control room of unified management and monitoring, without having to separately control, saving manpower.
3. improve comfort:
Due to the DDC system than the legacy systems with greater accuracy, temperature can be kept closer to set the value of value, to improve the living environment.
4. no need to calibrate:
The majority of the calibration DDC system without the need to reduce maintenance costs, and has been instrumental in maintaining the accuracy and the traditional system calibration after lower accuracy.
5. improving control mode:
DDC system allows a more complex control mode to complete the entire building's basic management, this reduces implementation costs and improve living comfort. DDC system according to the actual building sections refrigeration capacity adjustable ice water (cold water) unit of cooling capacity, in order to achieve the cooling water temperature requirements without cold, when building cooling capacity needs change, you can then adjust the ice water (cold water) unit.
6. the real estate value:
A set with DDC system device than the devices is not equipped with DDC has a higher value, it often made a complete construction plans, an important part, when a building houses, purchasing, often of the building is equipped with the latest management systems.
7. better control:
Due to the DDC system can complete a variety of logical functions, according to the objective of building operations made complex and precise control. Thus more superiority.
8. the highly flexible control:
Buildings of various parameters are not set in stone, the new client or new requirements for old customers often require a change to the building control requirements, most of the DDC system according to the new requirements to rewrite the program, without changing the hardware. Moreover, the DDC system is modal system, for later building extension, such as building, rebuilding, the system can be extended accordingly.
9. improving the living conditions:
Many building owners use the DDC system to encourage lease expires the customer remain in the building, when customers see their effectiveness of the management system in place, they are building more satisfied.
10. to improve maintenance and service:
The whole building uses DDC system, maintenance work can be done automatically by the system and records need to service the equipment and place, if needed, the DDC system also records all partly mechanical operation performance curve and the room temperature change, those in the analysis and diagnosis of mechanical system or controller problems very useful because the system could develop many deviations in operations, it many problems can be resolved before the customer becomes aware.

DDC system cost
In building DDC system installed throughout the terminal fee is declining, most have little or no cost increases. Taking into account the numerous Terminal DDC system, these cost advantages over conventional systems more efficient, if properly use the DDC system, its cost recovery in the short term.

DDC system can used for buildingsTransformation
The majority of architectural transformation of DDC system available, usually efficient transformation and improve control system should be improved and the refurbishment of the mechanical system. Sometimes it may be because the original control system is the old abandoned or due to customer comfort requirements, and transform control system, the majority of occasions, the old system part of the equipment can be reused and more efficient, up-to-date DDC system allows the transformation of a system, a system installation without having to install a central control room, the system can operate alone, until the end equipment with networking to work or install a central control room. This allows modification and design with a high degree of flexibility.

DDC system applicable to the construction
Now most of the buildings are applicable DDC system, including office buildings, schools, hospitals, hotels and industrial buildings.

DDC system suitable for which the mechanical system
In fact most of the mechanical system, a typical are: VAV system (VAV), heat pumps, air blower plate Tube, air supply unit air conditioner, air treatment system, fan system and architecture Centre equipment and additional equipment can be connected to the DDC system, security protection, life protection and displays, LEDs, and other signals.

Many buildings can networking
Central control room to make use of broadband ADSL network regulation control multiple buildings, a central computer can receive the distance between the various alerts, signals, and in the central control room operation and complete all necessary everywhere.
Close to that of the building are available through Ethernet networking, a terminal can be placed in one of the building, its operations may be transferred to the network signals of the other Terminal, office buildings and schools or very good.

DDC system can provide a record of past use
Installed in the regions (room) of the sensor can be used by client throttling changed the region set point, when the set changes, the air treatment system or part of the mechanical system of the action, the system can also provide monthly operational records of the customer.

DDC system is needed to operate the computer experience
The current market most systems do not require a high level of computer expertise, of course, different system operation ease, in the evaluation of a system, it should be noted that it is made to the operation of menu-driven and screen displays, and a help key provides help information. Selection should be avoided need school training or specialized training before being qualified to operate the system.

DDC system can assist the consultant engineer
Consultant engineer can greatly benefit from DDC system. Start by building construction, the engineer's Office by telephone line to understand many of the building, he can control the information provided by the system on the machine for maintenance without having to get out of the Office, so that works when you can save a lot of costs.

DDC system on service and management company benefits
Installed in the building of the DDC system can monitor the operation of the building in a timely manner, on the problems of rapid response, and to take effective measures, the system can also be contacted through remote telecommunications equipment, and to receive a signal from the Tower, the Tower of hands-on monitoring by distance, and change the set point, schedules, and even control software
。 This is not an important issue or when you want to improve, you can save expensive travel. When maintenance personnel need to, he can also predict failure causes through networking in order to arrive at the scene after a solution to the problem, which can greatly improve his productivity, and reduce the level of customer dissatisfaction.

DDC system control device and the differences between the mechanical system equipment
DDC system can timely control and display the normal equipment of a variety of devices including: led, environmental nozzle, door lock .... etc. Will these devices connected to the DDC system that provides users an easy way to change the timetable.

DDC system applicable building size
DDC system may be installed on all kinds of buildings, in a small building its special advantages is its remote monitor can be installed in a management services company, in large buildings, its advantages are available through the central management system management, thus more than a single management and energy savings.