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Much has been written about direct digital control technology and theory, and many arguments are cited to support its superiority over more conventional systems. This paper demonstrates by application example the argument that digital. control provides superiority in terms of simplicity, functionality, and accuracy in very complex control loops.

A comparison between a discrete component control system and a digital control system for the supply and return fans in a variable-volume air-distribution system forms the basis for the argument.

Citation: Symposium, ASHRAE Transactions, 1984, vol. 90, pt. 2B, Kansas City, MO