ACCURATE AND ENERGY CONSERVATIVE GROWTH CHAMBER WITH TIME DIVISION PID CONTROL ACTION

EGUCHI H., TOH K., KITANO M. and MATSUI T. Accurate and energy conservative growth chamber with time division PID control action. BIOTRONICS 14, 15-31, 1985. The time division PID control action was applied to air temperature and humidity control in a growth chamber where four directexpansion coils were used for cooling and dehumidifying. This system was optimaIized by adjusting the control interval of the time division PID control action: The interval of 60 sec was optimal for accurate control and energy conservation. In this growth chamber, it was made possible to control air temperature and humidity with accuracies of ±0.3°C and ±3 %RH even under energy conservative condition.