Direct Digital Control (DDC) Advantages

Energy Efficiency and DDC Advantages

DDC EMCSs replace conventional pneumatic or electromechanical HVAC control systems with equipment capable of performing not only control but energy management and system diagnostic functions in the environment of a centralized computer network. An EMCS accepts analog, discrete, and digital input from remote sensors and devices, processes the data, and then controls remote mechanical equipment. An EMCS inherently has more accurate control because it reduces the drift, maintenance and recalibration problems common with pneumatic control systems. Additionally, an EMCS can make all facilities function more efficiently when the gathered data are compiled into useful, pertinent reports. Quality control, production, research, and maintenance will all benefit from the increased information flow when it is properly managed. [Ruys, 1990]

Compared to conventional control systems, DDC offers the following advantages:

·Control Precision,

·Systems Coordination,

·Optimum Start,

·Diversity Analyses,

·Retrofit Identification,

·System Load Tracking,

·Monitoring and Maintenance Information,

·Trend Information and History data, and

·Energy Reporting.


DDC vs. conventional pneumatic controls

DDC control integration

Monitoring and maintenance


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