Abstract
For analysis and synthesis of D.D.C. system for phytotronics, three sub-system; process, computer and process-controller, should be examined.
In this paper, design and characteristics of processcontroller which is composed of interface between computer and process are made clear.
And D.D.C. system which has a temperature-control algorithm upon characteristics of process in the previous paper and upon characteristics of process-controller in this paper is investigated.
As a result, the settling time of cooling on-off in D.D.C. upon f eedf orward method is one-third as large as that of cooling on-off in feedback control.
