Implementation of a Feedback Direct-Digital Control Algorithm for a Heat Exchanger

1980 ◽  
Vol 19 (4) ◽  
pp. 546-550 ◽  
Author(s):  
Gerhard K. Giger ◽  
Donald R. Coughanowr ◽  
Werner Richarz
Keyword(s):  
Heat Exchanger ◽  
Digital Control ◽  
Control Algorithm ◽  
Direct Digital Control

A general direct digital control algorithm for a class of linear systems

AIChE Journal ◽  
1978 ◽  
Vol 24 (2) ◽  
pp. 360-364 ◽  
Author(s):  
Rajeev Gautam ◽  
Rajakkannu Mutharasan
Keyword(s):  
Linear Systems ◽  
Digital Control ◽  
Control Algorithm ◽  
Direct Digital Control

A Direct Digital Control Algorithm for Control of a Single Environmental Space

1985 ◽  
Vol 107 (4) ◽  
pp. 324-331 ◽  
Author(s):  
D. B. Cherchas ◽  
A. Abdelmessih ◽  
M. Townsend
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Discrete Time ◽  
Digital Control ◽  
Control Algorithm ◽  
Environmental Space ◽  
Practical Performance ◽  
Simulation Results ◽  
Time Form ◽  
Direct Digital Control

A direct digital control algorithm for control of dry bulb temperature in a single environmental space is developed. The algorithm is based on a bilinear mathematical model, developed in the paper, of the response of the space dry bulb temperature and moisture content. The algorithm is somewhat unique in that it includes feedback and feedforward terms in a manner respecting the bilinear nature of the controlled process and as well, minimizes a practical performance index. The discrete time form of the algorithm is presented and simulation results given.

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