METHOD AND SYSTEM FOR AUTOMATIC CONTROLLING OF TEMPERATURE MODE IN GREENHOUSE Russian patent published in 1999 - IPC

FIELD: agriculture, in particular, methods and equipment for maintaining microclimate in greenhouses. SUBSTANCE: method involves dividing greenhouse heating system into two groups so that power capacity of first group of heaters is continuously recounted as difference in losses through greenhouse guards and solar radiation intensity, with power capacity of heaters of second group making 20-25% of maximum power capacity of heaters of first group. Current value of maximum power capacity of second group of heaters depends upon variations in optimum and outer temperatures, solar radiant flux density, as well as upon heat loss coefficient, plant age and photoperiod. System has computer with timer connected through analog-to-digital converter and power amplifier to respective actuating member. Heaters of second group controlled by deviations are connected through respective actuating mechanism and amplifier to input of comparator. Inner temperature sensor and output of optimum temperature computing unit are connected to comparator. EFFECT: increased efficiency in keeping air temperature in greenhouse at precise predetermined level. 3 cl, 3 dwg